Sunday, 15 October 2017

OP-AMP INTERVIEW QUESTION AND ANSWERS

By Ask Biomedical

An ideal-opamp would have the following characteristics:-
1 Infinite voltage gain
2 Infinite input resistance
3 Zero o/p resistance
4 Zero o/p voltage when (i/p voltage is zero)
5 Infinite Band with
6 infinite common mode Rejection ratio
7 infinite slew rates.
2)what are the main features of Ics 741?
1 No external frequency compensation required.
2 short circuit protection.
3 offset null capability.
4 large common mode and differential voltage range
5 low power consumption
6 No latch up problem
3)what do you mean by differential input resistance?
differential input resistance is the equivalent resistance that can be measured at either the inverting and non inverting input terminal with the other terminal connected to ground.
4)what do you mean common mode rejection ratio (CMMR).
common mode rejection ratio define as “it is the ratio of the differential voltage Gain to the common mode gain of an op-amp.
CMMR= differential gain/ common mode gain
5)what do you mean by SVRR (supply voltage rejection ratio).
the change in an op-amp input –offset voltage, caused by variation in supply voltage is called supply voltage rejection ratio (SVRR).
6)what do you mean by slew rate of an op-amp.?
slew rate is the maximum rate of change of output voltage per unit of time.
7)what do you mean by an open loop configuration of an op-amp?
the open loop configuration of an op-amp indicate the No connection, exist between The output signal is not fed-back in any from into the input.
8)How many configuration in open-loop op-amp configuration?
there are three open-loop op-amp configurations:
1 Differential –amplifier.
2 Inverting amplifier
3 Non- inverting amplifier
9)what do you mean by voltage follower?
the lowest gain that can be obtained from a non-inverting amplifier with feed back Is 1. When the non-inverting amplifier is configured for unity, it is called a voltage Follower.
10)what do you mean by a comparator?
Comparator is an open-loop op-amplifier which compares the input voltage at other one terminal to a reference voltage at other terminal and produce a voltage at their output terminal.
11)what do you mean by a zero-crossing detector?
Zero-detector is a comparator in which a zero reference is applied at their non-inverting terminal. Zero-crossing detector switches their output from one state to another state if the input voltage crosses the zero point.
12)what do you mean by input offset current?
The algebraic difference between the current in the inverting terminals is as know as Input offset current.
13)what do you mean by input offset voltage?
Input offset voltage that must be applied between the two input terminal of an Op-amp to null the output.
14)what do you mean by input biased current?
input biased current is the average of the current that flow into the inverting and Non Inverting input terminals of the op-amps.

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