Effects of parasitic elements in operational transconductance amplifier AM modulator

On the basis of spectral domain analysis a general method is described for the calculation of the noise effects of the parasitic elements in operational transconductance amplifier amplitude modulator. Parasitic elements are determined as a function of the controlling current of the operational transconductance amplifier. Output voltage waveform which is the AM modulated signal is derived in terms of the circuit parameters, and signal and noise powers are calculated.