1
GATE EE 1991
MCQ (Single Correct Answer)
+1
-0.3
Figure shown below shows a common emitter amplifier. The quiescent collector voltage of the circuit is approximately. GATE EE 1991 Analog Electronics - Bjt and Mosfet Biasing Question 9 English
A
$${{20} \over 3}V$$
B
$$10V$$
C
$$14V$$
D
$$20V$$
2
GATE EE 1991
Subjective
+2
-0
With the ideal operational amplifiers, the circuit in figure simulates the equation GATE EE 1991 Analog Electronics - Operational Amplifier Question 44 English
3
GATE EE 1991
Subjective
+5
-0
In the figure shown, assume that the zener diode and operational amplifier to be ideal.

$$(a)$$ Draw the equivalent circuit and evaluate the gain $$\left( {{V_0}\,\,vs\,\,{V_i}} \right)$$ of the circuit for

GATE EE 1991 Analog Electronics - Operational Amplifier Question 10 English

$$(i)$$ $${V_i} \le 0$$ $$\,\,\,\,\,\left( {ii} \right)\,\,\,0 < {V_i} < 5V\,\,\,\,\,\,$$ $$\,\,\,\,\,\left( {iii} \right)\,\,\,{V_i} > 5V\,\,\,\,\,\,$$

$$(b)$$ Sketch the gain $$\left( {{V_0}\,\,\,{V_s}\,\,\,{V_i}} \right)$$ characteristics of the above circuit and label the salient features.

4
GATE EE 1991
Subjective
+5
-0
Figure shows a common emitter amplifier GATE EE 1991 Analog Electronics - Small Signal Modeling Question 3 English 1 GATE EE 1991 Analog Electronics - Small Signal Modeling Question 3 English 2

$$(a)$$ Simplify the circuit by applying thevenin's theorem to biasing network $${R_1},{R_2}$$ at
$$\,\,\,\,\,\,\,$$ the base of the transistor.
$$(b)$$ Assuming $${C_s}$$ to be a short for frequency range considered. Draw the small signal
$$\,\,\,\,\,\,\,$$ $$a.c.$$ model of the circuit obtained in $$(a)$$ by using the simple model for the
$$\,\,\,\,\,\,\,$$ transistor shown in figure.
$$(c)$$ Evaluate the small signal gain $$\left( {{{{V_0}} \over {{V_i}}}} \right)$$ of the amplifier.

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