GATE ECE

Bipolar Junction Transistor

Analog Circuits

(Past Years Questions)

Marks 1

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Consider the circuit shown in the figure. Assuming VBE1 = VEB2 = 0.7 volt, value of the dc voltage Vc2 (in volt) is _...
GATE ECE 2016 Set 3
Resistor R1 in the circuit below has been adjusted so that I1 = 1 mA. The bipolar transistor Q1 and Q2 are perfectly mat...
GATE ECE 2016 Set 2
If the emitter resistance in a common-emitter voltage amplifier is not bypassed, it will
GATE ECE 2014 Set 4
In the circuit shown, the PNP transistor has $$\left|{\mathrm V}_\mathrm{BE}\right|=0.7\;\mathrm V$$ and β = 50. Assume ...
GATE ECE 2014 Set 3
A cascade connection of two voltage amplifiers A1 and A2 is shown in the figure. The open-loop gain Av0, input resistanc...
GATE ECE 2014 Set 2
The current ib through the base of a silicon npn transistor is $$1\;+\;0.1\;\cos\left(10000\;\mathrm\pi\;\mathrm t\right...
GATE ECE 2012
In the circuit shown below, capacitors C1 and C2 are very large and are shorts at the input frequency. Vi is a small si...
GATE ECE 2011
In the silicon BJT circuit shown below, assume that the emitter area of transistor Q1 is half that of transistor Q2.The ...
GATE ECE 2010
The amplifier circuit shown below uses a silicon transistor. The capacitors CC and CE can be assumed to be short at sign...
GATE ECE 2010
The input impedance (Zi) and the output impedance (Zo) of an ideal transconductance (voltage controlled current source) ...
GATE ECE 2006
The cascode amplifier is a multistage configuration of
GATE ECE 2005
Assuming VCesat=0.2V and β = 50, the minimum base current (IB) required to drive the transistor in the figure to saturat...
GATE ECE 2004
The current gain of a BJT is
GATE ECE 2001
Introducing a resistor in the emitter of a common amplifier, stabilizes the dc operating point against variations in
GATE ECE 2000
The circuit of Fig. is an example of feedback of the following type ...
GATE ECE 1998
From a measurement of the rise time of the output pulse of an amplifier whose input is a small amplitude square wave, on...
GATE ECE 1998
The emitter coupled pair of BJT’s gives a linear transfer relation between the differential output voltage and the diffe...
GATE ECE 1998
In a series regulated power supply circuit, the voltage gain Av of the ‘pass’ transistor satisfies the condition:...
GATE ECE 1998
A BJT is said to be operating in the saturation region if
GATE ECE 1995
A transistor having $$\alpha$$ = 0.99 and VBE = 0.7 V, is used in the circuit of the figure.What is the value of the col...
GATE ECE 1995
In order to reduce the harmonic distortion in an amplifier, its dynamic range has to be _________
GATE ECE 1994
A common emitter transistor amplifier has a collector current of 1.0 mA when its base current is 25 $$\mu$$A at the r...
GATE ECE 1994
The bandwidth of an n-stage tuned amplifier, with each stage having a band width of B, is given by
GATE ECE 1993
For the amplifier circuit of figure, the transistor has a $$\mathrm\beta$$ of 800. The mid-band voltage gain $$V_0/V_1$...
GATE ECE 1993

Marks 2

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In the circuit shown, transistors Q1 and Q2 are biased at a collector current of 2.6 mA. Assuming that transistor curre...
GATE ECE 2017 Set 2
For the DC analysis of the Common-Emitter amplifier shown, neglect the base current and assume that the emitter and coll...
GATE ECE 2017 Set 1
In the figure shown, the npn transistor acts as a switch. For the input vin(t)as shown in the figure, the transistor ...
GATE ECE 2017 Set 1
In the ac equivalent circuit shown, the two BJTs are biased in active region and have identical parameters with β >> 1....
GATE ECE 2015 Set 2
In the circuit shown, I1 = 80 mA and I2 b= 4mA. Transistors T1 and T2 are identical. Assume that the thermal voltage VT...
GATE ECE 2015 Set 1
Consider the common-collector amplifier in the figure (bias circuitry ensures that the transistor operates in forward ac...
GATE ECE 2014 Set 4
A BJT in common-base configuration is used to amplify a signal received by a $$50\,\Omega $$ antena. Assume kT/q = 25 m...
GATE ECE 2014 Set 4
For the common collector amplifier shown in the figure, the BJT has high $${V_{CE\left( {sat} \right)}},$$ and $${V_{BE...
GATE ECE 2014 Set 4
In the circuit shown, the silicon BJT has $$\beta \,\,\,\,50.\,\,\,\,\,$$ Assume $${V_{BE}}\,\,\, = \,\,\,0.7$$ and $${V...
GATE ECE 2014 Set 3
A BJT is baised in forward active mode Assume VBE = 0.7 V, kT/q = 25 mV and reverse saturation current Is = 10-13A. The ...
GATE ECE 2014 Set 1
For the amplifier shown in the figure, the BJT parameters are VBE = 0.7 V, $$\beta $$ = 200, and thermal voltage VT = 2...
GATE ECE 2014 Set 1
In the circuit shown below, the silicon npn transistor Q has a very high value of $$\beta $$. The required value of R2 i...
GATE ECE 2013
The voltage gain Av of the circuit shown below is ...
GATE ECE 2012
For a BJT, the common-base current gain $$\alpha = \,\,0.98$$ and the colector base junction reverse bias saturation cu...
GATE ECE 2011
For the BJT Q1 in the circuit shown below, $$\beta = \infty ,\,\,\,\,{V_{BEon\,}}\, = \,0.7V,\,\,\,{V_{CEsat}}\, = \,0....
GATE ECE 2011
A small signal source Vi(t) = A cos 20t + B sin 106 t, is applied to a transistor Amplifier as shown in fig. The transis...
GATE ECE 2009
In the following transistor circuit, VBE = 0.7V, re = 25m/IE, $$\beta $$ and all the capacitances are very large. T...
GATE ECE 2008
In the following transistor circuit, VBE = 0.7V, re = 25m/IE, $$\beta $$ and all the capacitances are very large. ...
GATE ECE 2008
In a transconductance amplifier , it is desirable to have
GATE ECE 2007
For the BJT circuit shown, assume that the $$\beta $$ of the transistor is very large and VBE = 0.7 V. The mode of oper...
GATE ECE 2007
In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters: $${\beta _{D...
GATE ECE 2006
In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters: $${\beta _{D...
GATE ECE 2006
In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters: $${\beta _{D...
GATE ECE 2006
For an npn transistor connected as shown in the figure, VBE = 0.7 volts. Given that reverse saturation current of the ju...
GATE ECE 2005
The circuit using a BJT with β = 50 and VBE = 0.7 V is shown in the figure. The base current IB and collector voltage V...
GATE ECE 2005
A bipolar transistor is operating in the active region with a collector current of 1mA. Assuming that the 'β' of the tra...
GATE ECE 2004
In the amplifier circuit shown in the figure, the values of R1 and R2 are such that the transistor is operating at VCE =...
GATE ECE 2003
Three identical amplifiers with each one having a voltage gain of 50, input Resistance of 1 KΩ and output resistance of ...
GATE ECE 2003
In the circuit shown in the figure assume that the transistor is in the active region. It has a large β and its base Emi...
GATE ECE 2000
A Darlington stage is shown in the figure, if the transconductance of q1 is gm1 and q2 is gm2, then the overall transcon...
GATE ECE 1996
Match the following. Group - I (a)Cascode amplifier (b)Differential Amplifier (c)Darlington pair common-collector Am...
GATE ECE 1996
If the transistors in fig. has high value of β and a vBE of 0.65, the current I flowing through the 2 kilo ohms resis...
GATE ECE 1992
In figure, all transistors are identical and have a high value of beta. The voltage VDC is equal to ______. ...
GATE ECE 1991
Which of the following statements are correct for basic transistor Amplifier configurations?
GATE ECE 1990
For good stabilized biasing of the transistor of the CE Amplifier of fig, we should have ...
GATE ECE 1990
Of the four biasing circuits shown in Fig. For a BJT, indicate the one which can have maximum bias stability:
GATE ECE 1989
The quiescent collector current Ic, of a transistor is increased by changing resistance. As a result
GATE ECE 1988
Each transistor in the Darlington pair (see Fig. below) has hfe = 100. The overall hfe of the composite transistor negle...
GATE ECE 1988
The amplifier circuit shown below uses a compostie transistor of a MOSFET and BIPOLAR in cascade. ALL capacitance are la...
GATE ECE 1988
The transistor in the amplifier shown below has following parameters: $$${h_{fe}}\, = \,100,\,{h_{ie}}\, = \,2k\Omega ,...
GATE ECE 1988

Marks 5

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An emitter-follower amplifier is shown in the figure, Zi is the impedance looking into the base of the transistor and Z0...
GATE ECE 2001
For the amplifier of given figure,$${I_C}\, = \,1.3\,mA,\,{R_C}\, = \,2\,k\Omega ,\,{R_E}\, = \,500\,\Omega ,$$ $${V_T}...
GATE ECE 2000
A bipolar junction transistor amplifier circuit is shown in the figure. Assume that the current source Ibias is ideal, ...
GATE ECE 1999
In the circuit of fig. Determine the resistance Ro seen by the output terminals, ignore the effects of R1 and R2. ...
GATE ECE 1998
The transistor in the circuit shown in the figure. is so biased (dc biasing N/W is not shown) that the dc collector curr...
GATE ECE 1997
In the cascade amplifier circuit shown below, determine the values of R1, R2 and RL. Such that the quiescent current thr...
GATE ECE 1997

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