Electronics devices

Inverting amplifier using op-amp Inverting Amplifier An amplifire which gives 180' phase different between input and output is called inverting amplifier The block diagram of inverting amplifier By the virtual ground concept the two input terminals are always at the same potential As node B is grounded and also node A is at ground potential, from virtual ground concept I=Vin-Va/R1=Vin/R1 (as Va=0)....................equation (1) The op-amp input current is always zero hence entire current flows through the feedback resister Rf from output side I=Va-V0/Rf=-V0/Rf (as Va=0)..........................equation (2) from equation 1 and 2 Vin/R1=-V0/Rf Av=-Rf/R1 -Rf/R1 is the gain of the amplitude while negative sine indicates that the polarity of the output is opposite of the input hence this called inverting amplifier inverting amplifier waveforms ...