An op amp high gain negative feedback amplifier having two inputs, inverting and non-inverting.in the inverting amplifier input signal is applied to inverting terminal through a resistor 1kohm. The output signal is 180ยค out.phase to the input signal due very high open loop gain of op-amp gain of the amplifier with feedback depends only on the ratio of external resistor but not on the internal gain of the op amp. If feedback resistor,the voltage gain of inverting amplifier is given by
Av=Rf/Ri
And output is
Vo=Av (Vin)
where,
Rf- feedback resistor
Ri- input resistor
Av- voltage gain
Vo- output Volta
Vin- input voltage
