The measured gate to source voltage VGS V G S is 4. 1A below, the amplifier consists of (circle one answer) I) A Common-Source Amplifier followed by a Source-Follower Amplifier. The input impedance is connected across the input terminals of the amplifier while the output impedance is connected in series with the amplifier. The ac output is taken from the drain terminal, and an external load. Recalculate the output impedance and the voltage gain if a load resistor of 1 kQ is connected %3D at the source. Here’s the best way to solve it. Feb 20, 2019 · A Common Drain Amplifier Circuit Diagram has a voltage gain approximately equal to 1, no phase shift between input and output, very high input impedance, and low output impedance. Discuss the operation of these amplifiers: The source follower is a type of buffer circuit. In this circuit the drain terminal is directly connected to V DD. Usually it has higher trans The drain terminal is “common” between the input and the output. At the later part of the Our expert help has broken down your problem into an easy-to-learn solution you can count on. Given that. Question: QUESTION 12 The FET amplifier has high input impedance, low output impedance, and low voltage gain. allowthe desired level of DC current to flow, and 3. The prototype amplifier circuit with device model is shown in Figure 11. Where Z d = r d. This amplifier is Biased with a voltage dividor on the VDD. Z 0 = R D ║ Z d. 36 are R S = 4 k Ω, R 1 = 850 k Ω, R 2 = 350 k Ω, and R L = 4 k Ω. For a transistor, it is equal to the common base amplifier. Has very high output impedance. Nov 19, 2009 · A common drain amplifier has a higher output impedance compared to a common collector amplifier. The parameters of the circuit in Figure P4. For exemple, imagine a. couple to a small‐signal input source and to an output “load”. For a time being here, the load is not shown. A cascode amplifier has a high gain, moderately high input impedance, a high output impedance, and a high bandwidth. #2. Apply a test current to the output and measure the output voltage, Rout= vt/it. Transistor amplifier circuits such as the common emitter May 22, 2022 · The common source amplifier is analogous to the common emitter amplifier. The common drain amplifiers are useful when large input resistances and small. Common-source common-gate common-drain Input Impedance Very High(∞) Low Very High(∞) Output Impedance Medium Very High Low Current Gain High(β) Low(α) High Voltage Gain High Low. g V. Because of its high Z i, low Z o, and unity gain, the CD circuit is usually used as a buffer amplifier between a high impedance signal source and a low impedance load Figure below shows the source follower circuit in which drain terminal of the device is common. View the full answer Answer. 54. The output resistance of small signal model for common drain JFET amplifier equals 1 gm | | Rds (on) ∥ RS and since Rds (on) = 1 gm we can also write this formula as 1 gm ∥ 1 gm ∥ RS right? Which could be derived to ROUT = 1 gm / 2 ∥ RS right? resistance. The amplifier has a very small gain of approximately 1. For an NMOS common drain amplifier: - bias current is 10 uA. Look out of the 3 MOSFET terminals and In electronics, a common-source amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage or transconductance amplifier. Recalculate the output impedance and the voltage gain if a load resistor of 1 kΩ is connected at the source. 11-10 (a), with R D = 4. Therefore it is good for matching a high-impedance Jan 7, 2022 · The following shows the voltage measurement of common source with drain feedback E-MOSFET amplifier. The Cascode amplifier provides high intrinsic gain, high output impedance and large bandwidth. The Common Drain JFET Amplifier ac equivalent circuit is shown in Fig. output resistances are desired in voltage amplifiers. Derive the small-signal voltage gain expression for the following amplifier. Apr 11, 2023 · In the Common Source configuration (similar to common-emitter), the input is applied to the Gate and its output is taken from the Drain as shown. Since the N-channel JFET is a depletion mode device and is normally on, a gate voltage which has a negative polarity with respect to the source is required to modulate or control the The main advantage of the Common Drain MOSFET Amplifier is Select one: a. Apr 16, 2020 · What is Common Drain Amplifier. 15V. If R 1 = 5k6Ω, R 2 = 6k8Ω and the supply voltage is 12 volts. Problem 1P: Visit your local Jan 22, 2021 · The output of the cascode amplifier is measured at the drain terminal of the common gate stage (M2). 1, input is applied between gate and source and output is taken between source and drain. Also find the value of the Emitter resistor, RE if it has a voltage drop of 1v across it. View Answer. c. The most common configuration for the JFET as an amplifier is the common source circuit. a. e. It is also considered a common drain amplifier. It is used in analog circuits for providing high input impedance and less value of output impedance. g. Common Emitter and Common Source. 6. 5 V and 𝐼 𝐷𝑆𝑆 = 80 mA. But the load could be a passive resistive load or it could be an active load like a resistor. This current has to be the same for M1. The maximum drain efficiency of a Class-F amplifier can reach 100% [2]. (c) Determine the load current i, and the output voltage V, if i; = 5 sin ot uA. 4. The cascode is a two-stage amplifier that consists of a common emitter stage feeding into a common base stage when using bipolar junction transistors (BJTs) [1] [2] or alternatively a common source stage feeding a common gate stage when using field-effect transistors (FETs). The input signal is given at the gate terminal and the output is get from the drain pin. Jan 2, 2021 · In this video, the Source Follower (Common Drain Amplifier) configuration of the MOSFET and its small-signal analysis is explained. ÆProper “DC biasing” is required! Common Drain Amplifier In this circuit shown in figure 3. In this circuit, the source terminal of the transistor serves as the input, the drain is the output, and the gate is connected to some DC biasing Jul 29, 2023 · To calculate the output impedance and current gain of a common-drain (CD) MOSFET amplifier, also known as a source follower, you can use the small-signal model of the MOSFET. Most MOSFET amplifiers are fabricated on integrated circuits. Question: Which amplifier configurations typically have the lowest output impedance? a. Therefore for low impedance load the buffer must a) It has low input impedance. Assume 𝑉 𝐺𝑆 (𝑜𝑓𝑓) = −2. (10) (d) Compare MOS Common Source, Common Drain and Common gate amplifier in terms of input impedance, output impedance and gain. This configuration is less common but can be used where a low input impedance and high output impedance are required. c) Infinite gain. The circuit below shows a common-drain amplifier, usually referred to as a source follower. Jul 5, 2016 · As discussed in the first section of The MOSFET Differential Pair with Active Load, the magnitude of this amplifier’s gain is the MOSFET’s transconductance multiplied by the drain resistance: AV = gm ×RD A V = g m × R D. Common Emitter Common Base Common Collector g. - aspect ratio is 10. Dec 10, 2016 · Being an amplifying circuit, the output signal is 180o “out-of-phase” with the input. II) A Common-Drain Amplifier followed by a Common-Source Amplifier. In CS amplifier analysis we have seen that in order to achieve the high voltage gain the load impedance should be as high as possible. - drain resistor of 100 kΩ. Dec 20, 2019 · I was going through the AC equivalent circuit of Common Collector Amplifier from ELECTRONIC PRINCIPLES BY MALVINO 3RD EDITION and I came across the analysis for the output impedance of the circuit. e. What happens to the input impedance at high frequency? The (small signal) gain of a common-source stage is: gm * Rds. Solution. Unlock. The interaction between the output stage of an opera-tional amplifier (op amp) and capacitive loads can impact the stability of the circuit. 11-8(b), the output impedance at the FET drain terminal is, At the circuit output terminals, resistor R D is in parallel with Z d. (b) and (e) i. 75 mA and VsDQ = 6 V (8) (8) (b) Determine the input impedance R; and the output impedance Ro. The main advantage of MOSFET over BJT is Select one: O a. 12V while the calculated was 4. If we consider the input voltage and current to be V in and I in and the Because the output voltage at the FET source terminal follows variations in the signal voltage applied to the gate, the common drain circuit is also known as a source follower. 3. For the circuit in Fig. It is called common Drain amplifier. output. A representation of this configuration is shown in Figure 1 below : fig 1 : Definition of the input and output impedances. This means that it is better suited for driving high impedance loads, such as speakers or long transmission lines. Gate-source voltage of M1 (= VG1 - drain voltage of M2) is adjusted so that the drain current of M1 is equal to the drain current of M2. As C 1 charges through R 1, the voltage across R 1 falls, so the op-amp draws current from the input through R L. Has very low input impedance. 53 and its ac equivalent circuit is shown in Fig. And through small-signal analysis, the expression of the input imped A common-drain amplifier is one in which the input signal is applied to the gate and the output is taken from the source, making the drain common to both. A Common Gate Circuit has a voltage gain, no phase shift between input and output, low input impedance, and relatively high output impedance. 21. Can be modeled as a current amplifier, Modeled as transconductance IC=βIB, or a transconductance amplifier , amplifier, iDS=KvGS iC=KvBE. Calculate the values of: V B, V C and V E, the emitter current I E, the internal emitter resistance r’ e and the amplifiers voltage gain A V when a load resistance If you saw the pdf whose link I've mentioned or the video I mentioned, the common procedure told there is :As with the impedance of two-terminal devices such as resistors and capacitors, the input (output) impedance is measured between the input (output) nodes of the circuit while all independent sources in the circuit are set to zero Nov 19, 2009 · A common drain amplifier has a higher output impedance compared to a common collector amplifier. Nov 21, 2023 · A Common Gate MOSFET amplifier is an electronic amplifier device where the input signal is applied to the source terminal, drain terminal gives the output and Gate terminal is connected to the Ground terminal. Mar 22, 2017 · The common gate has the input on the source and the output on the drain. b) It has high output impedance. Figure 3. A source follower has a high input impedance, low output impedance, and a voltage gain of less than one, or unity. . Real lab work: Circuit 1- Source Follower / Common Drain Amplifier: 1. The first step is to develop the small-signal model shown in Figure 3. Because it is common, there is no need for a drain resistor. 4 The Source Follower (Common Drain Ampli- er) This is similar to the emitter follower for the BJT, which is used as a voltage bu er. Looking into the output of the CS equivalent circuit in Fig. In contrast, a Class-A operating point is usually at half the I max value, as A cascode amplifier consists of a common emitter stage loaded by the emitter of a common base stage. high drive capability). So, the circuit output impedance is, Because r d is typically 100 kΩ and R D is usually much lower than 50 kΩ, the circuit output impedance is . 2 kΩ, and R L ≫ R D, A v ≈ -2. Common Gate c. (a) common-gate amplifier. With double termination, this has the drawback that the signal level delivered to the line is reduced by –6 dB (or half) from the signal at the amplifier’s output. Now let’s incorporate the finite output resistance: And next we recall that the small-signal analysis technique Jul 5, 2016 · As discussed in the first section of The MOSFET Differential Pair with Active Load, the magnitude of this amplifier’s gain is the MOSFET’s transconductance multiplied by the drain resistance: AV = gm ×RD A V = g m × R D. Where gm is the amount of current change due to a change in Vgs (again, small signal !) These current variations are then fed into the small signal impedance at the drain. 1. 61 mA. This circuit includes a swamping resistor, rS. 15 V. If the drain current is supplied by an ideal current source then the only impedance at the drain is Rds. Biasing employs a Aside from its low input impedance, the common-gate amplifier is similar to a CS amplifier as the input signal is across Gate-Source terminal and output taken from the Drain terminal. 4 (a). Jun 29, 2002 · 2002-06-29 8:55 am. The first amplifier that I read about was the CS amplifier: I found that for a typical common source amplifier configuration at low frequency, the input impedance would just be RG since the input impedance of the JFET is very high. Question: (30 points) Design 2 common drain amplifiers: one to improve the input impedance of the above amplifier to greater than 1000 ΚΩ, and the other one to improve the output impedance of the above amplifier to less than 100 Ω, Output swing: 5V But more importantly, as one goal of the common collector is to adapt a high input impedance from a previous stage (ex: common emitter) to a low output impedance, there is no reason to assume that Rs (=the output impedance of the previous stage) will be small even if it appears divided by beta in the calculation of Ro. Assume all transistors are biased in saturation region Note: To is considered "high impedance 1igm is considered low impedance" b) In Fig. The voltage gain is. Common drain stage is a non-inverting current amplifier. So, the circuit output impedance is, Because r d is typically 100 kΩ and R D is usually much lower than 50 kΩ, the circuit output impedance is Electrical Engineering questions and answers. The object is to solve for the small-signal voltage gain, input resistance, and output resistance. Common Source b. 01/V. 11-11. Example 4. 4 , determine the voltage gain and input impedance. Jul 17, 2020 · With R_s = 0, an M1 impedance contribution and an C_gs impedance are connected in parallel; the output impedance is $$ Z_0 = {1\over{g_m}} || {1\over{s·C_{gs}}} $$ Neglecting C_ds, an R_s contribution is in series, only it should be scaled down. Previous question Next question. Summary of MOSFET Amplifier Characteristics . The input signal is applied at gate-drain junction and output is taken from source to drain junction. Because of Voltage divider because the output impedance of the Rgen = 50Ω Vgen = Vin (Rgen + Rin) / Rin Use this value in LTspice and the laboratory Function generator Review: MOSFET Amplifier Design • A MOSFET amplifier circuit should be designed to 1. The drain voltage is 4. 53. This happens because of its inherited low input impedance and high Jan 2, 2021 · In this video, the Source Follower (Common Drain Amplifier) configuration of the MOSFET and its small-signal analysis is explained. 2 V, k p ′ = 40 μ A / V 2, W / L = 80, and λ = 0. 1. That's why a class AB amplifier has a common collector (a. Dec 26, 2020 · In this video, the small-signal analysis of the Common Gate (CG) Amplifier is explained. , "+mycalnetid"), then enter your passphrase. Classic output stages with the class-AB common-emitter bipolar junction Aug 1, 2020 · It is similar to the common drain or source follower configuration using the JFET in Fig. The input signal is presented to the gate terminal while the output is taken from the drain. Common Drain amplifiers are also known as Buffer circuit. 11-19 uses voltage divider bias. Has very low output impedance. May 22, 2022 · Determine the CMRR of the FET differential amplifier shown in Figure 3. common-gate common-source common-drain None of the above. Discuss the advantages and disadvantages of JFET circuits with those of comparable BJT How to Sign In as a SPA. Finally, for the input impedance we have. For the circuit of Figure 4. In electronics, a common-gate amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a current buffer or voltage amplifier. For an N-channel device the circuit would be biased as shown in Figure 2 . Figure 5. 51. Hence, in both amplifiers, the small signal gain equals the product of g m and total impedance at the drain. It offers high input impedance, low output impedance, it suitable for RF applications also for sensors and power managements. This configuration, which is sometimes known as a source follower, is characterized by a voltage gain of less than unity, and features a large current gain as a result of having a very large input impedance and a small output impedance. Calculate the output impedance and the voltage gain. 2. The common drain amplifier also called source follower or voltage follower is amplifier circuitry. (a) Determine Rp and Rs such that Ipo = 0. However, it's possible to build a common-emitter push Looking into the output of the CS equivalent circuit in Fig. The gate of the NMOS is the input, the drain is Table 8-1. The next screen will show a drop-down list of all the SPAs you have permission to acc The Common-Drain Ampli fier Basic Circuit Fig. This is why it is called a common gate amplifier. The Common drain amplifiers are different from Common source amplifiers where the resistor connected across the drain. we now that. Common-drain amplifier • A voltage buffer takes the input voltage which may have a relatively large Thevenin resistance and replicates the voltage at the output port, which has a low output resistance • Input signal is applied to the gate • Output is taken from the source • To first order, voltage gain ≈1 • Input resistance is high A general common drain JFET amplifier, self-biased, is shown in figure below. Compare and analyze JFET voltage amplifiers and voltage followers. 15V V G S = 4. Jun 14, 2022 · A common collector amplifier is constructed using an NPN bipolar transistor and a voltage divider biasing network. 36 (a Jun 19, 2020 · The Common drain amplifier is a single transistor MOSFET amplifier, one of the basic fundamental MOSFET amplifiers. In this Amplifier Circuit, input signal is applied to the source terminal S and output is taken from the drain terminal D, as illustrated in Fig. It provides both voltage and power gain. 05 V − 1. alaskanaudio said: The great benefit of using a common source configuration in a amplifier that drives a loudspeaker is that you gain the ability to control the output impedance via a selected amount of negative feedback around the stage. 1: Common source amplifier with model. Has very high input impedance. Figure 1: Common-drain amplifier. 4 (b). The small-signal model allows us to analyze the circuit's behavior around its operating point by considering small changes in input and output signals. This circuit is dc biased th same way as the source follower. 18 Sep 20, 2022 · A common-gate amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies used in electronics, typically as a current buffer or voltage amplifier. Now let’s incorporate the finite output resistance: And next we recall that the small-signal analysis technique Apr 23, 2021 · The idea behind a class AB amplifier is to provide a class A amplifier's low distortion and a class B amplifier's low output impedance (i. b. 7 kΩ, R S = 2. The FET Common Gate Circuit (CG) shown in Fig. Overall Amplifier Configuration. However, it's possible to build a common-emitter push From the self bias equation or graph this produces a drain current of 2. Select configuration for a single-transistor amplifier with a gain of 25 dB and input impedance of 400Kohm or above. Reply Mar 1, 2024 · I have been trying to learn how JFETs work. Figure 6. From the derivation of the input impedance equation, and neglecting r d, Usually, The voltage gain of a FET Common Source Amplifier circuit with an unbypassed source resistor can be quickly estimated using Eq. 1 Common Drain Amplifier Diagram Source Electronic Tutorials In this circuit, the source voltage is V s = V G +V GS When a signal is applied to the JFET gate via C 1 Introduction. (1)Common-source amp (2)Common-drain amp (3)Common-gate amp We will use Rx instead of Ro R o is for node output impedance while R x is for looking into transistor terminal Don’t memorize formula use a 1 page summary All transistors are assumed to be in the active region Both isc and voc are shown but ONLY 1 should be used (other set to Apr 22, 2024 · A common emitter amplifier circuit has a load resistance, RL of 1. The heavily loaded common emitter stage has a low gain of 1, overcoming the Miller effect. See Answer. To sign in to a Special Purpose Account (SPA) via a list, add a "+" to your CalNet ID (e. Transcribed image text: The FET amplifier has high input impedance, low output impedance, and no voltage gain. Because Drain terminal is common. The transistor parameters are V TP = − 1. Figure 11. It is a unit-gain ampli er with a very large input impedance but a smaller output impedance. Has very high input and output impedances. 13. Because there is no direct coupling from the output to input remaining amplification while allowing for a wide output swing. 0 0 0 0 d. The purpose of this stage is to serve as a buffer, lowering the output impedance and increasing the drivability while providing unity gain. 5V. advertisement. - K P = 100 uA/V 2. This is a non inverting amplifier with a large input resistance. A common method to provide output impedance match-ing is to place resistors equal to the desired impedance in series with the amplifier’s output. Consider the cases when channel length modulation are absent and present. emitter follower) output configuration (answer 1 and answer 3). - λ = 0. The op amp represents high impedance, just as an inductor does. DC Solution (a) Replace the capacitors with open circuits. 36). Synthetic impedance matching Apr 23, 2021 · The idea behind a class AB amplifier is to provide a class A amplifier's low distortion and a class B amplifier's low output impedance (i. This continues as the capacitor charges, and eventually the op-amp has an input and output close to virtual ground because the lower end of R 1 is connected to ground. 18. The gate is grounded and external load resistor R L is connected For an NMOS common drain amplifier, the bias current is 10 uA, aspect ratio is 10, K, = 100 uA/V2 and a source resistor of 100 kN, and A = 0. ensure that the MOSFET operates in the saturation region, 2. 3. Assume R L = ∞. Nov 3, 2023 · Common Gate Amplifier: The input is applied at the source and the output is taken from the drain in this configuration. Input signal level needed to produce the required output voltage. Vin = Vout / Av The open circuit voltage of the generator to produce the required output voltage. Draw and explain a basic AC model of a JFET. If output voltage (Out) is changed, the drain current of M1 would change due to the channel-length Cascode. Here is a complete description of the common-source amplifier using FET. A common-drain amplifier is also called a source-follower. d) Output will be same as input. The common – source amplifier circuit is most widely used than any other amplifier circuits because it can produce high input and output impedance, and also its performance is high. As in the JFET common drain configuration, the MOSFET retains its high input impedance but now has reduced output impedance and approximately unity voltage gain. This fabrication process, with such small If you saw the pdf whose link I've mentioned or the video I mentioned, the common procedure told there is :As with the impedance of two-terminal devices such as resistors and capacitors, the input (output) impedance is measured between the input (output) nodes of the circuit while all independent sources in the circuit are set to zero A general common drain JFET amplifier, self-biased, is shown in figure 5. Learning Objective: Common Drain Amplifier Problem 5 (Modified from Textbook 4. The Common Drain Amplifier: Small Signal Model. (a) and (d) h. k. 2kΩ and a supply voltage of 12v. JFET Common-Drain Amplifier: Nov 30, 2022 · The output impedance of this circuit equals the output impedance of a common source amplifier i. This configuration uses source as the input, drain as the output, and gate is grounded or “common”. Apr 1, 2021 · To evaluate the performance of the amplifier, the drain efficiency, DE, is (3) DE = P out P DC where P out is the output power of the amplifier, while P DC is the power delivered from a DC source. Throughout the industry, op-amp output-stage requirements have changed greatly since their original creation. 55V whereas ideally drain voltage is same as the gate to source voltage VGS = 4. Figure P4. Note: The bulk is not tied to the source. Case-I: λ = 0 both for M1 and M2 → In such a case M2 presents a degenerating impedance of 1/gm2 to a single stage CS amplifier as shown below. 5V at t=2S, If this signal is given to Common drain amplifier, what will be its output at t=2S? a) 7. This is the most common mode of operation of the FET due to its high input impedance and good voltage amplification and as such Common Source amplifiers are widely used. Emitter/Source is neither an input nor an output. 1 shows the circuit diagram of a single stage common-drain amplifier. Now if we look intuitively in the diagram from FIG 8-4(a) we can easily reach figure 8-4 (b) no problem at that JFET Common Drain Amplifier The common Drain amplifier is like common collector configuration of BJT’s. Common Gate configuration: In the Common Gate configuration (similar to common base), the input is applied to the Source and its output is taken from the Drain with the Gate connected directly to the ground (0v) as shown. The gate terminal of the transistor serves as the signal input in this circuit (NMOS), the source is the output, and the drain is common to both (input and The common source JFET amplifier has one important advantage compared to the common-emitter BJT amplifier in that the FET has an extremely high input impedance and along with a low noise output makes them ideal for use in amplifier circuits that require very small input voltage signals. Calculate the maximum Collector current ( Ic) flowing through the load resistor when the transistor is switched fully “ON” (saturation), assume Vce = 0. Common Drain d. A common gate amplifier is mainly used for CMOS RF receivers because of its property of impedance matching and has lower noise. There are 2 steps Step 1. At the later part of the Sep 20, 2022 · A common-drain amplifier, also known as a source follower, is one of three basic single-stage field-effect transistor (FET) amplifier topologies used as a voltage buffer in electronics. The high input impedance feature Understanding MOSFET On-State Drain-to-Source Resistance; My 40-Year Love Affair with a Remarkable Amplifier—A Class B Amplifier for Audiophiles; NXP’s 1-, 2-, 4- and 8-Channel Level Translators Optimized for Open-Drain Outputs; White Paper: How to Measure and Reduce Common Mode EMI in Electric Drive Installations Common gate. Non-inverting Amplifier Common-source Common-drain Common emitter with RE follower circuit QUESTION 5 Select configuration for a single-transistor amplifier with input impedance of VG2 voltage determines the current going into the drain of M2. This circuit is used to conduct a low output impedance and a higher input impedance. This is because the restriction of 100 percent self-negative feedback is gone. The current generator is g m V gs where V gs = V in – V out. Moreover R G = R 1 || R 2. 44 shows the configuration biased for signal processing. The circuit of a simple Common Gate JFET Amplifier is shown in Fig. The easiest way to tell if a FET is common source, common drain, or common gate is to examine where the signal enters and leaves. A common-drain amplifier is shown below. The CG amplifier has the low input impedance and high ouput impedance. The strategy for solving this problem is to develop the common-mode and differential-mode equivalent circuits and solve for the gain of each. In this circuit, the transistor’s source terminal serves as the input, the drain serves as the output, and the gate is connected to ground, or “common Jul 17, 2020 · They are common-source, common drain (source-follower), and common-gate amplifier circuits. 18: JFET common drain Mar 22, 2021 · After completing this chapter, you should be able to: Determine the voltage gain, input impedance and output impedance of basic JFET amplifiers. The Source follower amplifier (Common Drain amplifier) is an amplifier with the Vin and Vout having a common node at the drain of the MOSFET. Thus, a common-gate JFET circuit is mostly used in places where a low impedance source is required to be coupled with a high impedance load. The output stage located on the far right is a common drain amplifier and consists of M12 acting as an amplifier with a resistor load. A sinusoidal signal has 1. The result gives high-voltage gain, with low current and power gain. common-drain common-gate common-source None of the above QUESTION 13 The current gain of an FET amplifier is undefined depends upon the value of gm for the device less than or equal to 1 generally assumed to be zero. Let us analyze the input resistance, output resistance, and the gain of the amplifier. es tu zz er jz ya te so eh dn