Title :
Phase-locked broadband GaAs HBT VCO module for millimeter-wave astronomical local oscillators
Author :
Kuo, Yue-Fang ; Hwang, Yuh-Jing ; Chiong, Chau-Ching ; Weng, Ro-Min ; Chen, Ming-Tang
Author_Institution :
Inst. of Astron. & Astrophys., Acad. Sinica, Taipei, Taiwan
fDate :
Sept. 29 2009-Oct. 1 2009
Abstract :
A phase-locked broadband GaAs HBT voltage controlled oscillator module is designed, fabricated and tested for the local oscillators in millimetre-wave astronomical heterodyne receivers. The configuration of the local oscillator module is based on the offset phase-locked loop scheme with frequency dividing circuit in the feedback path. Employing closed-loop operation, the system can produce carrier frequencies with negligible reference spur. This system achieves phase noise of -94 dBc/Hz at 1 MHz offset and -104 dBc/Hz at 2 MHz offset, no significant spur observed.
Keywords :
III-V semiconductors; frequency dividers; gallium arsenide; heterojunction bipolar transistors; millimetre wave oscillators; phase locked loops; phase locked oscillators; voltage-controlled oscillators; GaAs; frequency dividing circuit; millimeter-wave astronomical local oscillators; millimetre-wave astronomical heterodyne receivers; offset phase-locked loop scheme; phase noise; phase-locked broadband HBT VCO module; Circuit testing; Feedback circuits; Frequency conversion; Frequency locked loops; Gallium arsenide; Heterojunction bipolar transistors; Local oscillators; Millimeter wave circuits; Phase locked loops; Voltage-controlled oscillators;
Conference_Titel :
Microwave Conference, 2009. EuMC 2009. European
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4748-0
