A Complete Study on Theoretical Representation of Harmonic Distortion in Balanced Pseudo Differential OTA

High frequency harmonic distortion of CMOS balanced pseudo differential operational transconductance amplifier (PD OTA) is analyzed in this paper with the aim to reduce the effects of harmonic distortion into a simple equation. The analysis consists of a theoretical study using Volterra series and simulation results using HSPICE. Analysis and simulations results clear that the mechanism of harmonic distortion in balanced PD OTA is complex but can be represented by simple equation in low and high frequency. Frequency-dependent harmonic distortion reveals effects of memorized component of balanced PD OTA in linearity decreasing versus frequency increasing. Influences of current mirror’s nonlinearity, circuit’s parameters, parasitic capacitances and load’s impedance are considered.

کلیدواژه ها:

pseudo differential operational transconductance amplifier (PD OTA) ، positive simple transconductor (TC) ، harmonic distortion ، Volterra analysis