A comprehensive design method for dual-gate MOSFET mixers

摘要

A comprehensive design method for a dual-gate MOSFET (DGFET) mixernis proposed which provides a practical procedure to predict both thenconversion gain and input compression point and to identify optimal biasnconditions and local oscillator (LO) power level. Each step in thenprocess can be implemented by either simulation or experimental methodsnand is suitable for both up-conversion or down-conversion. The techniquenis aimed at producing a well engineered design, not a rigorous numericalnsolution. Using a discrete packaged device, a single-balanced DGFETndown-converter mixer circuit is designed and characterized using an RFninput frequency of 857 MHz, LO frequency of 694 MHz, and an IF outputnfrequency of 163 MHz