1
GATE ECE 2010
+1
-0.3
The amplifier circuit shown below uses a silicon transistor. The capacitors CC and CE can be assumed to be short at signal frequency and the effect of output resistance r0 can be ignored. If CE is disconnected from the circuit, which one of the following statements is TRUE?
A
The input resistance Ri increases and the magnitude of voltage gain AV decreases
B
The input resistance Ri decreases and the magnitude of voltage gain AV decreases
C
Both input resistance Ri and the magnitude of voltage gain AV decrease
D
Both input resistance Ri and the magnitude of voltage gain AV increase
2
GATE ECE 2010
+2
-0.6
Consider the common emitter amplifier shown below with the following circuit parameters:

$$\beta = 100,\,{g_m} = 0.3861\,{\rm A}/V,\,{r_0} = \infty ,\,{r_\pi } = 259\,\Omega,$$
$${R_s} = 1\,K\Omega ,{R_B} = 93\,K\Omega ,\,{R_C} = 250\,\Omega,$$
$${R_L} = 1\,K\Omega ,\,{C_1} = \infty \,\,and\,\,{C_2} = 4.7\,\mu F.$$

The Resistance seen by the source Vs is

A
$$258\Omega$$
B
$$1258\Omega$$
C
$$93\Omega$$
D
$$100\Omega$$
3
GATE ECE 2010
+2
-0.6
Consider the common emitter amplifier shown below with the following circuit parameters:

$$\beta = 100,\,{g_m} = 0.3861\,{\rm A}/V,\,{r_0} = \infty ,\,{r_\pi } = 259\,\Omega,$$
$${R_s} = 1\,K\Omega ,{R_B} = 93\,K\Omega ,\,{R_C} = 250\,\Omega,$$
$${R_L} = 1\,K\Omega ,\,{C_1} = \infty \,\,and\,\,{C_2} = 4.7\,\mu F.$$

The lower cut-off frequency due to C2 is

A
33.9 Hz
B
27.1 Hz
C
13.6 Hz
D
16.9 Hz
4
GATE ECE 2010
+1
-0.3
The transfer characteristic for the precision rectifier circuit shown below is (assume ideal OP-AMP and practical diodes)
A
B
C
v
D
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