Application of Complex Negative Feedback Technology in Broadband Active Microwave Cold Noise Source
Aiming at the contradiction between output low temperature noise performance and working bandwidth in the design of C-band broadband active microwave cold noise source,in this paper the ATF38143 GaAs-based pseudomorphic high electron mobility transistor(pHEMT)of Avago company is selected to design a C-band broadband active microwave cold noise source.The series and parallel negative feedback circuit topology improves the working bandwidth while ensuring the low-temperature noise out-put performance.Its center frequency is 6.95 GHz,the working bandwidth is 1.3 GHz,and the relative bandwidth is 18.7％.Its lowest in-band output noise temperature is 141.62 K under the normal temperature conditions,and the working frequency band can cover the three channels of the C-band microwave radiometer center frequency points of 6.60 GHz,6.93 GHz,and 7.30 GHz.
active microwave cold noise sourcemicrowave radiometercalibrationremote sensinghigh electron mobility transistor
万方数据
维普
