GATE EE
Analog Electronics
Bjt and Mosfet Biasing
Previous Years Questions

## Marks 1

A transistor circuit is given below. The Zener diode breakdown voltage is $$5.3$$ $$V$$ as shown. Take base to emitter voltage drop to be $$0.6$$ V. T...
When a bipolar junction transistor is operating in the saturation mode, which one of the following statements is TRUE about the state of its collector...
In the following circuit, the transistor is in active mode and $${V_C} = 2V.$$ To get $${V_C} = 4V,$$ we replace $${R_C}$$ with $${R_C}.$$ Then the ra...
In the given circuit, the silicon transistor has $$\beta$$ $$=75$$ and a collector voltage $${V_C} = 9\,V.$$ Then the ratio of $${R_B}$$ and $${R_C}... The transistor in the given circuit should always be in active region. Take$${V_{CE\left( {sat} \right)}} = 0.2\,\,V,\,\,\,{V_{BE}} = 0.7\,\,V.\,\,\...
The magnitude of the mid-band voltage gain of the circuit shown in figure is (assuming $${h_{fe}}$$ of the transistor to be $$100$$) ...
The common emitter forward current gain of the transistor shown is $${\beta _p} = 100.$$ The transistor is operating in ...
The three terminal linear voltage regular is connected to a $$10\Omega$$ load resistor as shown in the figure. If $${V_{in}}$$ is $$10$$ $$V,$$ what ...
Assume that the $$N$$-channel $$MOSFET$$ shown in figure is ideal, and that its threshold voltage is The voltage $${\rm I}V,$$ the voltage $${{V_{ab}... Two perfectly matched silicon transistors are connected as shown in figure. The value of the current$${\rm I}$$is ... A bipolar junction transistor (BJT) is used as a power control switch by biasing it in the cutoff region (OFF state) or in the saturation region (ON s... In the circuit of figure shown, assume that the transistor has$${h_{fe}} = 99$$and$${V_{BE}} = 0.7V.$$The value of collector current$${{\rm I}_C...
The variation of drain current with gate-to-source voltage $$\left( {{{\rm I}_D} - {V_{GS}}} \right.$$ characteristic$$\left. \, \right)$$ of a MOSFET...
The enhancement type n-channel MOSFET is represented by the symbol
One of the applications of current mirror is
The depletion region (or) space charge region (or) transition region in a semiconductor $$p-n$$ junction diode has
In the transistor circuit shown in figure. Collector to ground voltage is $$+20V.$$ Which of the following is the probable cause of error? ...
Figure shown below shows a common emitter amplifier. The quiescent collector voltage of the circuit is approximately. ...

## Marks 2

For the circuit shown in the figure below, it is given that $${V_{CE}} = {{{V_{CC}}} \over 2}.$$ The transistor has $$\beta = 29$$ and $${V_{BE}} = 0... The circuit shown in the figure uses matched transistors with a thermal voltage$${V_T} = 25\,mV.$$The base currents of the transistors are negligibl... The voltage gain$${A_V}$$of the circuit shown below is ... The transistor used in the circuit shown below has a$$\beta $$of$$30$$and$${{\rm I}_{CBO}}$$is negligible. If the forward voltage drop of diod... The transistor circuit shown uses a silicon transistor with$${V_{BE}} = 0.7V,{{\rm I}_C} \approx {{\rm I}_E}$$and a$$DC$$current gain of$$100.$$... Two perfectly matched silicon transistors are connected as shown in the figure. Assuming the$$\beta $$of the transistors to be very high and forward... Consider the circuit shown in figure. If the$$\beta $$of the transistor is$$30$$and$${{\rm I}_{CBO}}$$is$$20nA$$and the input voltage ... The common emitter amplifier shown in the figure is biased using a$$1mA$$ideal current source. The approximate base current value is_____. ... Assume that the threshold voltage of the$$N$$-channel$$MOSFET$$shown in figure is$$0.75V.$$The output characteristics of the$$MOSFET$$are ... Assume that the threshold voltage of the$$N$$-channel$$MOSFET$$shown in figure is$$0.75V.$$The output characteristics of the$$MOSFET$$are ... The value of$$R$$for which the$$PMOS$$transistor in Figure.$$Q63$$will be biased in linear region is ... For the$$n$$-channel enhancement$$MOSFET$$shown in figure,, the threshold voltage$${V_{th}}\,\, = \,\,2V.$$The drain current$${I_D}$$of the$$M...
In the circuit shown, the current gain $$'\beta '$$ of the ideal transistor is $$10.$$ The operating point of the transistor $$\left( {{V_{CE}},{{\rm ... An$$N$$-channel$$JFET$$having a pinch-off voltage$$\left( {{V_P}} \right)$$of$$-5V$$shows a transconductance (gm) of$$1mA/V$$when the ap... In the circuit of figure, the value of the base current$${{\rm I}_B}$$will be ... A$$NPN$$Si transistor is meant for low-current audio amplification. Match is following characteristic against their values. ... ## Marks 5 For the circuit shown in Figure,$${{\rm I}_E} = 1\,\,mA,\,\,\,\beta = 99$$and$${V_{BE}} = 0.7\,\,V$$determine (a) Current through$${R_1} and \$...
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