1
GATE ECE 1997
Subjective
+5
-0
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 = 5V.
![GATE ECE 1997 Analog Circuits - Bipolar Junction Transistor Question 8 English](https://gateclass.cdn.examgoal.net/examside/questions/6ae7329eccae768217c1dc25e8967312b540c9fb729bd48839ed2548be81b7d7.jpg)
The N/W components have following values, RC = 2$$k\Omega $$,
RS = $$1.4k\Omega $$,
RE = $$100\Omega $$.
The transistor has specifications, $$\beta \,\, = \,\,100$$
and base spreading resistance $${r_{bb\,}}^1\, = \,100\Omega $$
Evaluate input resistance Ri for two cases. At a frequency of 10 kHz
(a)CE, the bypass capacitor across RE is 25 $$\mu F$$
(b)The bypass capacitor CE is removed leaving RE unbypassed.
2
GATE ECE 1997
Subjective
+5
-0
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 and the collector voltage Vc1 = 3V, and Vc2 = 6V. Tke VBE = 0.7V, Transistor $$\beta $$ to be hifgh and base currents to be negligible.
![GATE ECE 1997 Analog Circuits - Bipolar Junction Transistor Question 7 English](https://gateclass.cdn.examgoal.net/examside/questions/ebb3bd8623f234243d2d6094e961b9f1cf65c21ada9f1c8ecb682c1b9df2df69.jpg)
3
GATE ECE 1997
MCQ (Single Correct Answer)
+1
-0.3
An Amplifier a has 6 dB gain and 50 $$\Omega $$ input and output impedances. The noise figure of this Amplifier as shown in the figure is 3 dB. A cascade of two such Amplifiers as in the figure will have a noise figure of
![GATE ECE 1997 Analog Circuits - Operational Amplifier Question 85 English 1](https://gateclass.cdn.examgoal.net/examside/questions/2734138e672865bad8e841c1b7f3075938760cf518d95d186bb20e565d0b6c4a.jpg)
![GATE ECE 1997 Analog Circuits - Operational Amplifier Question 85 English 2](https://gateclass.cdn.examgoal.net/examside/questions/ddd4228b5761e08e6f1b3d3c1ba7cf36ea102ace7a3eeffdf495a94b90fccffa.jpg)
4
GATE ECE 1997
Subjective
+2
-0
Negative feedback in
1. Voltage series configuration
2.Current shunt configuration
(a) increases input impedance
(b) decreases input impedance
(c) increases closed loop gain
(d) leads to ascillation.
Paper analysis
Total Questions
Analog Circuits
7
Communications
3
Control Systems
4
Digital Circuits
9
Electromagnetics
6
Electronic Devices and VLSI
1
Engineering Mathematics
2
Microprocessors
3
Network Theory
10
Signals and Systems
7
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