Analog Electronics
OP-AMP and its Applications
Practice questions from OP-AMP and its Applications.
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IncorrectAssuming ideal op-amps, the circuit represents a
Using virtual short analysis,
&
Option (d) is correct.
The op-amps in the following circuit are ideal. The voltage gain of the circuit is ________ (round off to the nearest integer).
For ideal op-amps,
Using at Node A
Using Virtual short concept,
Using at Node
Using virtual short concept,
A difference amplifier is shown in the figure. Assume the op-amp to be ideal. The CMRR (in ) of the difference amplifier is ________ (rounded off to 2 decimal places).
By virtual short,
By KCL,
Consider the OP AMP based circuit shown in the figure. Ignore the conduction drops of diodes and . All the components are ideal and the breakdown voltage of the Zener is . Which of the following statements is true?
The maximum and minimum values of the output voltage are and , respectively.
The maximum and minimum values of the output voltage are and , respectively.
The maximum and minimum values of the output voltage are and , respectively.
The maximum and minimum values of the output voltage are and , respectively.
Applying open circuit test
Due to absence of feedback op-amp acts as comparator
V+ = 0 V- = VIN
during +ve half cycle VIN > 0 V- > V+
V0 = -VSAT
D1 & zener diode are forward biased & D2 is reverse biased
During -ve half cycle VIN < 0 V- < V+
V0 = VSAT = 15V
D2 is forward biased & D1 & Zener diode are reverse biased
Zener diode goes into BD.
During +ve half cycle
∴ minimum value of V0 = -10V
During -ve half cycle
∴ Maximum value of V0 = 5Volt