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The Method of Increasing of CMRR for CJFET Dual Differential Input Stages for the Tasks of Processing Sensor Signals Under Conditions of Cryogenic Temperatures and Penetrating Radiation

The architecture of the CJFET dual differential input stage (DDS) architecture is available for converting differential output sensor signals. DDS is proposed, in which the circuitry solutions are available. They provide the increase of the CMRR, including in severe application (low temperatures, radiation). It is shown that due to the special construction of the output current adder in the considered DDS, the transconductance of the input common-mode signal is significantly reduced to the output DSS. The versions of practical circuits of CJFET dual differential input stages based on current mirrors and "folded" cascodes with the increased CMRR and the results of their computer simulation at cryogenic temperatures in LTspice simulation software on CJFET models are presented. The proposed DDSs are recommended to be used in the structure of low-noise analog interfaces of sensors of various physical quantities applied in medicine, high-energy physics, and space instrument engineering.