Characteristics of OP-AMP

Ideal characters of an Op-Amp:

1. Open Loop gain

Open loop gain is defined as the gain of the Op Amp without any feedback. An ideal OP Amp should have an infinite open loop gain but tin practical op-amp its range between 20,000 and 2, 00000.

2. Input impedance

It is the ratio of the input voltage and -input current. Ideally, it should be infinite without any leakage of current from the supply to the inputs. But practical op-amp there will be a few Pico ampere current leakages in most Op Amps.

3. Output impedance

The ideal Op Amp should have zero output impedance without any internal resistance. So that it can provide full current to the load connected to the output terminal.

4. Bandwidth

The ideal Op Amp should have an infinite frequency response so that it can amplify any frequency from DC signals to the maximum AC frequencies. But practical Op Amps have limited bandwidth.

5. Offset

The output of the Op Amp should be zero when the voltage difference between the input terminals is zero. But in practical Op Amps, the output will not be zero when off but there will be a small voltage.