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

fYear

2009

fDate

Sept. 29 2009-Oct. 1 2009

Firstpage

1824

Lastpage

1827

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2009. EuMC 2009. European

Conference_Location

Rome

Print_ISBN

978-1-4244-4748-0

Type

conf

Filename

5296586