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

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 $${r_{bb\,}}^1\, = \,100\Omega $$

$$Assume\,\,{{KT} \over q}\,\, = \,\,25\,mV$$

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
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 GATE ECE 1997 Analog Circuits - Operational Amplifier Question 85 English 2
A
6 dB
B
8 dB
C
12 dB
D
none of the above
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.

EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12