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Recent questions tagged bjt-and-mosfet-amplifiers

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GATE ECE 2025 | Question: 11
A simplified small-signal equivalent circuit of a BJT-based amplifier is given below.The small-signal voltage gain $V_{o} / V_{S}$ (in $\mathrm{V} / \mathrm{V})$ is $\_\_...
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GATE ECE 2000 | Question 1.4
In the differential amplifer of the figure, if the source resistance of the current source $I_{E E}$ is infinite, then the common-mode gain iszeroinfiniteindeterminate$\f...
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GATE ECE 2000 | Question 11
For the amplifier of given figure, $I_{C}=1.3 \mathrm{~mA}$, $R_{C}=2 \; \mathrm{k} \Omega, R_{\mathrm{E}}=500 \; \Omega, \mathrm{V}_{\mathrm{T}}=\mathrm{T} / q=26 \; \ma...
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GATE ECE 2000 | Question 13
The figure shows a common base amplifier.(a) Write expressions for the time-constants associated with the capacitors, $C_{B}$ and $C_{S}$.(b) What is the approximate lowe...
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GATE ECE 1999 | Question 1.8
In the cascade amplifier shown in the given figure, if the common - emitter stage $\left(Q_{1}\right)$ has a transconductance $\mathrm{gm}_{1}$, and the common base stage...
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GATE ECE 1999 | Question 1.9
Crossover distortion behaviour is characteristic ofClass $\text{A}$ output stageClass $\text{B}$ output stageClass $\mathrm{AB}$ output stageCommon - base output stage
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GATE ECE 2001 | Question: 2.6
The transistor shunt regulator shown in the figure is has a regulated output voltage of $10 \mathrm{~V}$, when the input varies from $20 \mathrm{~V}$ to $30 \mathrm{~V}$....
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GATE ECE 1998 | Question 1.13
The $f_{\mathrm{T}}$ of a $\text{BJT}$ is related to its $g m, \mathrm{C}_\pi$ and $\mathrm{C}_\mu$ as follows$f_{\mathrm{T}}=\frac{\mathrm{C}_\pi+\mathrm{C}_{\mu}}{g_\te...
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GATE ECE 2003 | Question: 11
Choose the correct match for input resistance of various amplifier configurations shown below$\begin{array}{ll}\text { Configuration } & \text { Input resistance } \\ \te...
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GATE ECE 2003 | Question: 15
Generally, the gain of a transistor amplifier falls at high frequencies due to theinternal capacitances of the devicecoupling capacitor at the inputskin effectcoupling ca...
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GATE ECE 2004 | Question: 46
A bipolar transistor is operating in the active region with a collector current of $1 \mathrm{~mA}$. Assuming that the $\beta$ of the transistor is $100$ and the thermal ...
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GATE ECE 2005 | Question: 17
The cascode amplifier is a multistage configuration of$\mathrm{CC}-\mathrm{CB}$$\mathrm{CE}-\mathrm{CB}$$\mathrm{CB}-\mathrm{CC}$$\mathrm{CE}-\mathrm{CC}$
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GATE ECE 2005 | Question: 49
In an ideal differential amplifier shown in the figure, a large value of $\left(R_{E}\right)$.increases both the differential and common-mode gains.increases the common-m...
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GATE ECE 1995 | Question 1.25
A change in the value of the emitter resistance, $\mathrm{R}_{\mathrm{e}^{\prime}}$ in a difference amplifieraffects the difference mode gain $\mathrm{A}_{d}$affects the ...
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GATE ECE 1995 | Question 3.7
(A) Common-collector amplifier(B) Common-emitter amplifier(C) Common-base amplifierProvides voltage gain but no current gainProvides current gain but no voltage gainPro...
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GATE ECE 1996 | Question 3.2
(a) Cascade amplifier(b) Differential(c) Darlington pairdoes not provide current gainis a wideband amplifier amplifierhas very low input common-emitter impedance and very...
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GATE ECE 2006 | Question: 31
In the two port network shown in the figure below, $z_{12}$ and $z_{21}$ are, respectively$r_e$ and $\beta r_o$$0$ and $-\beta r_o$$0,$ and $\beta r_o$$r_e$ and $-\beta r...
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GATE ECE 2006 | Question: 72
Common Data for Questions 71, 72,73:In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters:\[ \beta_{\mathrm{DC}}=60, ...
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GATE ECE 2006 | Question: 73
Common Data for Questions 71, 72,73:In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters:\[ \beta_{\mathrm{DC}}=60, ...
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GATE ECE 1994 | Question 1.9
A class - A transformer coupled, transistor power amplifier is required to deliver a power output of $10$ watts. The maximum power rating of the transistor should not be ...
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GATE ECE 2008 | Question: 48
Two identical $\text{NMOS}$ transistors $\text{M1}$ and $\text{M2}$ are connected as shown below. $\mathrm{V}_{\text {bias }}$ is chosen so that both transistors are in s...
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GATE ECE 1993 | Question 4.6
For the amplifier circuit of the figure is the transistor a $\mathrm{B}$ of $800$ . The midband voltage gain $\mathrm{V}^{0} / \mathrm{V}^{1}$, of the circuit will be$0$$...
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GATE ECE 1993 | Question 6.9
In a multi-stage $\text{R-C}$ coupled amplifier the coupling capacitorlimits the low frequency responselimits the high frequency responsedoes not affect the frequency res...
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GATE ECE 2009 | Question: 35
A small signal source $v_{i}(t)=A \cos 20 t+B \sin 10^{6} t$ is applied to a transistor amplifier as shown below. The transistor has $\beta=150$ and $h_{i e}=3 \; \mathrm...
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GATE ECE 1991 | Question 1.21
In figure, both transistors are identical and have a high value of beta. Take the $dc$ base-emitter voltage drop as $0.7$ volt and $\mathrm{KT} / \mathrm{q}=25 \; \mathrm...
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GATE ECE 2014 Set 4 | Question: 38
A BJT in a common-base configuration is used to amplify a signal received by a $50 \Omega$ antenna. Assume $kT/q=25 \: mV$. The value of the collector bias current (in mA...
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GATE ECE 2014 Set 4 | Question: 39
For the common collector amplifier shown in the figure, the BJT has high $\beta$, negligible $V_{CE(sat)}$, and $V_{BE}=0.7 \: V$. The maximum undistorted peak-to-peak ou...
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GATE ECE 2014 Set 1 | Question: 39
For the amplifier shown in the figure, the BJT parameters are $V_{BE} = 0.7\:V, \beta = 200,$ and thermal voltage $V_{T} = 25\:mV.$ The voltage gain $(v_{0}/v_{i})$ of th...
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GATE ECE 2017 Set 1 | Question: 41
For the DC analysis of the Common-Emitter amplifier shown, neglect the base current and assume that the emitter and collector currents are equal. Given that $V_{T}=25mV,V...
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GATE ECE 2017 Set 1 | Question: 41
For the circuit shown, assume that the NMOS transistor is in saturation. Its threshold voltage $V_{tn}=1V$ and its transconductance parameter $\mu_{n}C_{ox}\big(\frac{W}{...
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