Harmonic and Intermodulation Performance of Quantum-Wire-Transistor (QWT) Based Inverting Amplifier

摘要

This paper presents a simple mathematical model for the gate-voltage/ drain-voltage transfer characteristic of the quantum-wire transistor (QWT)-based inverting amplifier. The model, basically a Fourier cosine-series, yields closed-form expressions for the amplitudes of the harmonic and intermodulation components of the drain voltage resulting from a multisi-nusoidal gate voltage with a superimposed DC voltage. The special case of a two-tone equal-amplitude gate signal is considered in detail. The results show that the harmonic and intermodulation performance of the QWT-based inverting amplifier is strongly dependent on the values of the super-imposed DC voltage and the amplitudes of the input tones with either the second-order or the third-order intermodulation component dominating. The results also show that some of the harmonics and intermodulation products may exhibit minima at different values of the superimposed DC voltages and tone amplitudes.