1
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

2
GATE ECE 1997
Subjective
+5
-0
An IC 555 chip has been used to construct a pulse generator. Typical pin connections with components is shown below in fig. for such application. However it is desired to generate a square pulse of 10KHz.. Evaluate values of $${R_{A\,}}$$ and $${R_{B\,}}$$ and if the capacitor has the value of 0.01$$\mu$$F for the configuration closed. If necessary you can suggest modifications in the external circuit configuration.
3
GATE ECE 1997
+2
-0.6
The output voltage V0 of the circuit shown in the figure is
A
-4 V
B
6 V
C
5 V
D
-5.5 V
4
GATE ECE 1997
Subjective
+5
-0
Consider the circuit given in fig. using an ideal operational Amplifier.

The characteristics of the diode are given by the relation I = Is $$\left[ {{e^{{{qV} \over {KT}}}} - 1} \right],$$

Where V is the forward voltage across the diode
(a)Express V0 as a function of Vi assuming Vi> 0.
(b)If R = 100K$$\Omega$$ , Is = 1$$\mu$$A and $${{KT} \over q}\,\, = \,\,25mV$$

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