behavioural opamp 01 PUBLIC

Using the TANH() function, a near ideal behavioural opamp or comparator can be made.

Using the TANH() function, a near ideal behavioural opamp or comparator with a rail to rail limited output voltage swing can be made.

This model has infinite input common mode and differential range, input impedance and bandwidth, zero propagation delay and output impedance, and draws no input or supply current.

in is the input signal.

inp is the non-inverting input

fb is the inverting input

vcc is the positive supply rail

vee is the negative supply rail

Avol is the open loop gain. Note that Avol is divided by the rail to rail difference to make the actual open loop gain supply voltage independent.

Making Rfb open circuit allows the circuit to function as a comparator.