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Linear Analysis of Diode Mixers by the Nodal Equations Method in Generalized Matrix Form in the Frequency Domain Taking into Account Capacitive Parameters
Authors
	Golovan O.A.
	Korotkov A.S.
Date of publication
	2022
DOI
	10.31114/2078-7707-2022-3-190-197
Abstract
	The paper is a sequential of the works, in which an analysis approach of diode frequency converters in the generalized matrix form by the nodal equations method is considered. This method allows a full formalization of the analysis algorithm. The papers introduce a linearized diode model in the time and frequency domains. Based on the developed equivalent diode model, an iterative algorithm for analyzing both linear and nonlinear characteristics of three diode mixer circuits (balanced, double balanced, and triple balanced) is presented. Theoretical expressions for the conversion gain, the RF-IF isolation and the LO-IF isolation are obtained, and the influence of the mismatch effect of diode parameters is considered. The theoretical expression for the the 3-rd order nonlinear distortion coefficient is obtained. As is known, the frequency properties of diode frequency converters are determined by the frequency properties of diodes, particularly the p-n junction capacitance and diffusion capacitance. Due to this, it is necessary to develop the already existing analysis method of diode frequency converters by introducing capacitive parameters into the diode equivalent circuit, which will allow to estimate the frequency range of the mixers. Thus, this paper introduces an equivalent diode circuit, taking into account its capacitive parameters. If the diode is open, the diffusion capacitance is dominant, the p-n junction capacitance is negligible. Therefore, in this paper, the diode capacitance is represented as a diffusion capacitance. In the article a linear analysis of diode frequency converters (balanced, double balanced and triple balanced) is carried out. Expressions for conversion gain, the RF-IF isolation and the LO-IF isolation are obtained. The influence of technological spread of diode parameters on the conversion gain and port isolations is considered. The frequency properties of the mixers are estimated. As an example, the results of the double balance circuit calculation, which are confirmed by simulation results, are presented. The calculation results agree with the simulation results within 1.0-1.5 dB.
Keywords
	diode frequency converters, nodal equations method, conversion gain, RF-IF isolation, LO-IF isolation, mismatch effect, technological spread, frequency range, balanced mixer, double balanced mixer, triple balanced mixer.
Library reference
	Golovan O.A., Korotkov A.S. Linear Analysis of Diode Mixers by the Nodal Equations Method in Generalized Matrix Form in the Frequency Domain Taking into Account Capacitive Parameters // Problems of Perspective Micro- and Nanoelectronic Systems Development - 2022. Issue 3. P. 190-197. doi:10.31114/2078-7707-2022-3-190-197
URL of paper
	http://www.mes-conference.ru/data/year2022/pdf/D026.pdf