Bipolar Junction Transistor · Analog Circuits · GATE ECE
Start PracticeMarks 1
GATE ECE 2016 Set 3
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 2
Resistor R1 in the circuit below has been adjusted so that I1 = 1 mA. The bipolar transistor Q1 and Q2 are perfectly matched and have very high curren...
GATE ECE 2014 Set 4
If the emitter resistance in a common-emitter voltage amplifier is not bypassed, it will
GATE ECE 2014 Set 3
In the circuit shown, the PNP transistor has $$\left|{\mathrm V}_\mathrm{BE}\right|=0.7\;\mathrm V$$ and β = 50. Assume that RB = 100 kΩ.
For V0 to be...
GATE ECE 2014 Set 2
A cascade connection of two voltage amplifiers A1 and A2 is shown in the figure. The open-loop
gain Av0, input resistance Rin, and output resistance R...
GATE ECE 2012
The current ib through the base of a silicon npn transistor is
$$1\;+\;0.1\;\cos\left(10000\;\mathrm\pi\;\mathrm t\right)$$ mA
. At 300 K,
the $$r_\ma...
GATE ECE 2011
In the circuit shown below, capacitors C1 and C2 are very large and are shorts at
the input frequency. Vi
is a small signal input. The gain magnitude...
GATE ECE 2010
In the silicon BJT circuit shown below, assume that the emitter area of transistor
Q1 is half that of transistor Q2.The value of current I0 is approxi...
GATE ECE 2010
The amplifier circuit shown below uses a silicon transistor. The capacitors CC and
CE can be assumed to be short at signal frequency and the effect of...
GATE ECE 2006
The input impedance (Zi) and the output impedance (Zo) of an ideal transconductance
(voltage controlled current source) amplifier are...
GATE ECE 2005
The cascode amplifier is a multistage configuration of
GATE ECE 2004
Assuming VCesat=0.2V and β = 50, the minimum base current (IB) required to drive the transistor in the figure to saturation is
...
GATE ECE 2001
The current gain of a BJT is
GATE ECE 2000
Introducing a resistor in the emitter of a common amplifier, stabilizes the dc operating point against variations in
GATE ECE 1998
The emitter coupled pair of BJT’s gives a linear transfer relation between the
differential output voltage and the differential input voltage Vid only...
GATE ECE 1998
The circuit of Fig. is an example of feedback of the following type
...
GATE ECE 1998
From a measurement of the rise time of the output pulse of an amplifier whose
input is a small amplitude square wave, one can estimate the following p...
GATE ECE 1998
In a series regulated power supply circuit, the voltage gain Av of the ‘pass’
transistor satisfies the condition:
GATE ECE 1995
A transistor having $$\alpha$$ = 0.99 and VBE = 0.7 V, is used in the circuit of the figure.What is the value of the collector current?
...
GATE ECE 1995
A BJT is said to be operating in the saturation region if
GATE ECE 1994
In order to reduce the harmonic distortion in an amplifier, its dynamic range has
to be _________
GATE ECE 1994
A common emitter transistor amplifier has a collector current of 1.0 mA when its
base current is 25 $$\mu$$A at the room temperature. It's input ...
GATE ECE 1993
For the amplifier circuit of figure, the transistor has a $$\mathrm\beta$$ of 800. The mid-band voltage
gain $$V_0/V_1$$ of the circuit will be
...
GATE ECE 1993
The bandwidth of an n-stage tuned amplifier, with each stage having a band
width of B, is given by
Marks 2
GATE ECE 2024
Which of the following statements is/are true for a BJT with respect to its DC current gain $\beta$?
GATE ECE 2017 Set 2
In the circuit shown, transistors Q1 and Q2 are biased at a collector current of 2.6 mA.
Assuming that transistor current gains are sufficiently large...
GATE ECE 2017 Set 1
In the figure shown, the npn transistor acts as a switch.
For the input vin(t)as shown in the figure, the transistor switches between the cut-off a...
GATE ECE 2017 Set 1
For the DC analysis of the Common-Emitter amplifier shown, neglect the base current and
assume that the emitter and collector current are equal. Given...
GATE ECE 2015 Set 2
In the ac equivalent circuit shown, the two BJTs are biased in active region and have identical
parameters with β >> 1. The open circuit small ...
GATE ECE 2015 Set 1
In the circuit shown, I1 = 80 mA and I2 b= 4mA. Transistors T1 and T2 are identical. Assume that the thermal voltage VT is 26 mV at 27oC. At 50oC, th...
GATE ECE 2014 Set 1
For the amplifier shown in the figure, the BJT parameters are VBE = 0.7 V, $$\beta $$ = 200, and thermal voltage VT = 25 mV. The voltage gain (Vo/Vi ...
GATE ECE 2014 Set 1
A BJT is baised in forward active mode Assume VBE = 0.7 V, kT/q = 25 mV and reverse saturation current Is = 10-13A. The transconductance of the BJT (i...
GATE ECE 2014 Set 4
For the common collector amplifier shown in the figure, the BJT has high $${V_{CE\left( {sat} \right)}},$$ and $${V_{BE}}$$ $$\, = \,\,0.7\,\,\,V$$. ...
GATE ECE 2014 Set 4
A BJT in common-base configuration is used to amplify a signal received by a $$50\,\Omega $$ antena. Assume kT/q = 25 mV. The value of the collector ...
GATE ECE 2014 Set 4
Consider the common-collector amplifier in the figure (bias circuitry ensures that the transistor
operates in forward active region, but has been omit...
GATE ECE 2014 Set 3
In the circuit shown, the silicon BJT has $$\beta \,\,\,\,50.\,\,\,\,\,$$ Assume $${V_{BE}}\,\,\, = \,\,\,0.7$$ and $${V_{CE\left( {sat} \right)}}\, =...
GATE ECE 2013
In the circuit shown below, the silicon npn transistor Q has a very high value of $$\beta $$. The required value of R2 in k$$\Omega $$ to produce Ic ...
GATE ECE 2012
The voltage gain Av of the circuit shown below is
...
GATE ECE 2011
For a BJT, the common-base current gain $$\alpha = \,\,0.98$$ and the colector base junction reverse bias saturation current Ico = 0.6 $$\mu {\rm A}$...
GATE ECE 2011
For the BJT Q1 in the circuit shown below, $$\beta = \infty ,\,\,\,\,{V_{BEon\,}}\, = \,0.7V,\,\,\,{V_{CEsat}}\, = \,0.7V.$$. The switch is initially...
GATE ECE 2009
A small signal source Vi(t) = A cos 20t + B sin 106 t, is applied to a transistor Amplifier as shown in fig. The transistor has $$\beta $$ = 150 and h...
GATE ECE 2008
In the following transistor circuit, VBE = 0.7V, re = 25m/IE, $$\beta $$ and all the capacitances are very large.
The mid-band voltage gain of t...
GATE ECE 2008
In the following transistor circuit, VBE = 0.7V, re = 25m/IE, $$\beta $$ and all the capacitances are very large.
The Value of DC current IE is ...
GATE ECE 2007
In a transconductance amplifier , it is desirable to have
GATE ECE 2007
For the BJT circuit shown, assume that the $$\beta $$ of the transistor is very large and VBE = 0.7 V. The mode of operation of the BJT is
...
GATE ECE 2006
In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters: $${\beta _{DC}}$$ = 60, $${V_{BE}}$$ = ...
GATE ECE 2006
In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters: $${\beta _{DC}}$$ = 60, $${V_{BE}}$$ = ...
GATE ECE 2006
In the transistor amplifier circuit shown in the figure below, the transistor has the following parameters: $${\beta _{DC}}$$ = 60, $${V_{BE}}$$ = ...
GATE ECE 2005
The circuit using a BJT with β = 50 and VBE = 0.7 V is shown in the figure. The base current IB and collector voltage VC are respectively
...
GATE ECE 2005
For an npn transistor connected as shown in the figure, VBE = 0.7 volts. Given that reverse saturation current of the junction at room temperature $${...
GATE ECE 2004
A bipolar transistor is operating in the active region with a collector current of
1mA. Assuming that the 'β' of the transistor is 100 and the transco...
GATE ECE 2003
In the amplifier circuit shown in the figure, the values of R1 and R2 are such that the transistor is operating at VCE = 3V and IC = 1.5 mA when its $...
GATE ECE 2003
Three identical amplifiers with each one having a voltage gain of 50, input
Resistance of 1 KΩ and output resistance of 250Ω, are cascaded. The open c...
GATE ECE 2000
In the circuit shown in the figure assume that the transistor is in
the active region. It has a large β and its base Emitter voltage is
0.74. The valu...
GATE ECE 1996
A Darlington stage is shown in the figure, if the transconductance of q1 is gm1 and q2 is gm2, then the overall transconductance
$$g\matrix{
c \cr...
GATE ECE 1996
Match the following.
Group - I
(a)Cascode amplifier
(b)Differential Amplifier
(c)Darlington pair common-collector Amplifier
Group - II
(1)does not pro...
GATE ECE 1992
If the transistors in fig. has high value of β and a vBE of 0.65, the
current I flowing through the 2 kilo ohms resistance will be ______.
...
GATE ECE 1991
In figure, all transistors are identical and have a high value of beta. The voltage
VDC is equal to ______.
...
GATE ECE 1990
For good stabilized biasing of the transistor of the CE Amplifier of fig, we should have
...
GATE ECE 1990
Which of the following statements are correct for basic transistor Amplifier configurations?
GATE ECE 1989
Of the four biasing circuits shown in Fig. For a BJT, indicate the one which can have maximum bias stability:
GATE ECE 1988
The transistor in the amplifier shown below has following parameters:
$$${h_{fe}}\, = \,100,\,{h_{ie}}\, = \,2k\Omega ,\,{h_{re}}\, = \,0,$$$
$${h_{o...
GATE ECE 1988
The amplifier circuit shown below uses a compostie transistor of a MOSFET and BIPOLAR in cascade. ALL capacitance are large. gm of the MOSFET = 2 mA/V...
GATE ECE 1988
Each transistor in the Darlington pair (see Fig. below) has hfe = 100. The overall hfe of the composite transistor neglecting the leakage current is
...
GATE ECE 1988
The quiescent collector current Ic, of a transistor is increased by changing resistance. As a result
Marks 5
GATE ECE 2001
An emitter-follower amplifier is shown in the figure, Zi is the impedance looking into the base of the transistor and Z0 is the impedance looking into...
GATE ECE 2000
For the amplifier of given figure,$${I_C}\, = \,1.3\,mA,\,{R_C}\, = \,2\,k\Omega ,\,{R_E}\, = \,500\,\Omega ,$$ $${V_T}\, = \,26\,mV,\,\beta \, = \,1...
GATE ECE 1999
A bipolar junction transistor amplifier circuit is shown in the figure. Assume that the current source Ibias is ideal, and the transistor has very la...
GATE ECE 1998
In the circuit of fig. Determine the resistance Ro seen by the output terminals, ignore the effects of R1 and R2.
...
GATE ECE 1997
The transistor in the circuit shown in the figure. is so biased (dc biasing N/W is not shown) that the dc collector current IC = 1mA. Supply is VCC = ...
GATE ECE 1997
In the cascade amplifier circuit shown below, determine the values of R1, R2 and RL. Such that the quiescent current through the transistors is 1mA an...