An Audio pre-amplifier needs to reproduce signals as high as 20 kHz. The maximum output swing is 10 V peak. The minimum acceptable slew rate for the op-amp used is:

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This question was previously asked in

UGC NET Paper 2: Electronic Science 29 Oct 2022 Shift 1

Answer 1

Concept:

Slew rate is the maximum rate of change of output voltage with respect to time.

Slew rate limits the maximum frequency of operation of op-amp

The slew rate is usually measured in volts per microsecond.

Mathematically,

Vin = Vm sin 2πfmt and

V0 = AVin

then, the Slew rate is given as,

\(SR={\left( {\frac{{d{V_0}}}{{dt}}} \right)_{max}} = 2{\rm{\pi }}{{\rm{f}}_{{\rm{max}}}}{{\rm{V}}_0}_{{\rm{max}}}{\rm{\;}}\)

= 1.257 V/μs