Briefly Discuss About Op amp(Operational Amplifiers)


Definition of OP-AMP-:

An operational amplifier, or OP-AMP, is a high-gain electronic voltage amplifier & which can be used AC as well as DC both cases. Op amp  is DC coupled and contains a differential input and, usually, a single-ended output.

Operational amplifier

It is basically designed to perform mathematical operations like that Addition, Subtraction, Multiplication, Division etc. OP-AMPs may be single, dual, quad etc. An Op amp produces an output voltage which is often several times larger than the voltage difference between its input terminals.

Circuit Symbol Of OP-AMP

Equivlent circuit of op-amp

Characteristics of Ideal & Practical Op Amps :


Ideal Op amp

Practical Op amp (IC 741)

Open-loop gain G = vout / vinInfinite(∞)106
Input resistance RinInfinite(∞)1 MΩ – 2 MΩ
output resistance Rout050Ω – 100Ω
Offset voltage0<10 mV
Offset current010 nA
Open loop bandwidthInfinite(∞)≅1 MHz
Common-mode rejection ratio (CMRR)Infinite(∞)90 dB
Slew rateInfinite(∞)1 V/µSec
Phase shift0 


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