Frequency mixing circuit with impedance transforming power combiner

摘要

A frequency mixer circuit uses an impedance transforming power combiner to sum the power levels of RF and LO input signals and drive an output field effect transistor (FET). The nonlinear transconductance in the FET creates the sum and difference mixing products for providing an IF output signal operating at a frequency equal to the difference between the frequencies of the RF and LO input signals. The power combiner is impedance matched to the gate of the FET in order to minimize reflections back into the power combiner. The impedance transforming power combiner reduces component count and associated physical space requirements of the frequency mixing circuit.