Theory and Analysis of the Diode Frequency Mixers: Generalized Matrix Approach in the Frequency Domain

The paper is a sequel of the studies in which the analysis of diode mixers by the nodal equations method is considered. In this paper an equivalent diode model taking into account its capacitive parameters is introduced. Linear analysis of diode mixer circuits (balanced, double-balanced and triple-balanced) is performed. Expressions for the conversion gain, RF-IF isolation and LO-IF isolation are obtained. The influence of diode parameter technological spreads on the conversion gain and port isolation and the evaluation of the mixers frequency properties are discussed. Calculation and simulation results are presented.