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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.
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
Characteristics of Ideal & Practical Op Amps :–
Characteristics | Ideal Op amp | Practical Op amp (IC 741) |
Open-loop gain G = v_{out} / v_{in} | Infinite(∞) | 10^{6} |
Input resistance R_{in} | Infinite(∞) | 1 MΩ – 2 MΩ |
output resistance R_{out} | 0 | 50Ω – 100Ω |
Offset voltage | 0 | <10 mV |
Offset current | 0 | 10 nA |
Open loop bandwidth | Infinite(∞) | ≅1 MHz |
Common-mode rejection ratio (CMRR) | Infinite(∞) | 90 dB |
Slew rate | Infinite(∞) | 1 V/µSec |
Noise | 0 | |
Phase shift | 0 |