Journal of the Korean Institute of Telematics and Electronics D (전자공학회논문지D)
- Volume 35D Issue 3
- /
- Pages.1-10
- /
- 1998
- /
- 1226-5845(pISSN)
Design of cryogenic(4.2K) X-band HEMT oscillator for josephson voltage standard
조셉슨 전압 표준을 위한 극저온(4.2K) X-밴드 HEMT 발전기의 설계
Abstract
A new oscillator configuration is presented and tested for Josephson voltage standard operated at the cryogenic(4.2K) temperature. Features of active devices are investigated in aspects of 1/f noise, output power, and current collapse at low temperature. The output power of oscillator is optimized by a nonlinear design approach called Harmonic Two Signal Method(HTSM). The embedding newworks of the generalized six oscillators with tow loads are derived. A HEMT oscilliator is designed in X-Band for the Josephson voltage standard and tested at room and cryogenic(4.2K) temperatures. Oscillation frequency, output power, C/N ratio, and fequency stability are compared at room and low temperatures.
Keywords