Amplitude and Phase Stability Measurements of Multistage Microwave Receiver

摘要

The measurement technique and results of amplitude and phase stability measurements of microwave receiver and its separate stages are presented in this paper. Investigations were performed for prototype of new wideband receiving system for 13-m radio telescope RT-13 of the Institute of Applied Astronomy of the Russian Academy of Sciences. The receiver has two parallel channels for receiving linear orthogonal polarization and each of them is heterodyne type ones. The main sources of fluctuations and their types on different time intervals (from milliseconds to hundreds of seconds) are identified using Allan variance, power spectral density and correlation functions calculations. Phase stability measurements of unit with frequency conversion were performed by using 4-port R&S vector network analyzer. The contribution of the fluctuations of receiver separate stages to the overall receiver stability is determined taking into account the correlation between their fluctuations also.