1
GATE ECE 2012
+2
-0.6
The circuit shown is a
A
low pass filter with
$${f_3}dB = \,{1 \over {\left( {{R_1} + {R_2}} \right)C}}rad/s$$
B
high pass filter with
$${f_3}dB = \,{1 \over {{R_1}C}}rad/s$$
C
low pass filter with
$${f_3}dB = {1 \over {{R_1}C}}rad/s$$
D
high pass filter with
$${f_3}dB = {1 \over {\left( {{R_1} + {R_2}} \right)C}}rad/s$$
2
GATE ECE 2008
+2
-0.6
Consider the following circuit using an ideal Op-Amp. The I-V characteristics of the diode is described by the relation $$I = {I_0}\left[ {{e^{{V \over {VT}}}} - 1} \right], where \,{V_T}\,\, = \,\,25mV,{I_0}\,\, = 1 \mu {\rm A}$$\$

and V is the voltage across the diode (taken as positive for forward bias). For an input voltage $${V_i}\,\, = \,\, - 1V,$$ the output voltage V0 is

A
0 V
B
0.1 V
C
0.7 V
D
1.1 V
3
GATE ECE 2008
+2
-0.6
The Op-Amp circuit shown above represents a
A
high pass filter
B
low pass filter
C
band pass filter
D
band reject filter
4
GATE ECE 2008
+2
-0.6
Consider the Schmitt trigger circuit shown below.

A triangular wave which goes from -12V to 12V is applied to the inverting input of the OP-AMP. Assume that the output of the OP-AMP swings from +15V to -15V. The voltage at the non-inverting input switches between.

A
-12V and +12V
B
-7.5V and +7.5V
C
-5 V and +5 V
D
0 V and 5 V
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