Temperature Analysis of Quadrature Demodulator

This article introduce model of cost-effective analogue quadrature demodulator that based on quadrature directional couplers and its operation scheme. Also this paper present thermal investigation of the experimental prototype of this scheme using special thermal chamber and vector network analyser. This article describe basics of thermal compensation and termostatisation in a radio-electronic devices and the ways of its realisations. Experimental stand of the thermal investigation and its features that depends from device under test is described. Also in this paper described method and the scheme of the experimental thermal investigation. In this article presented results of the study as relation between phase shift error and frequency that measured and computed with current temperature and as relation between phase shift error and temperature. Introduced the maths model of the distortion and attenuation of the signal, that received by device under test, based on the obtained data. Also introduced graphical implementation of the proposed model of the relationship between signal attenuation and phase shift error.