Title :
Broad tuning microwave oscillators utilising multilayer technology and SiGe devices
Author :
Broomfield, Carl ; You, Yiming ; Parsons, Richard ; Everard, Jeremy
Author_Institution :
Dept. of Electron., York Univ., UK
Abstract :
This paper describes the design of a low phase noise 3.27-5.27 GHz VCO demonstrating phase noise performance varying from -96 to -102 dBc/Hz at 100 kHz offset over the whole band. The VCO incorporates a silicon germanium transistor as the active device. The resonator consists of a printed electrically short transmission line with printed shunt inductors at either end. Two varactor diodes are coupled in parallel to the centre of the resonator. The amplifier is placed on the other side of a 3-layer board and coupled to the resonator using capacitive vias. The oscillator operates at VCE=2 V and IC=30 mA. The design of a broadband (3-6 GHz) negative group delay equaliser capable of cancelling the phase shift in the amplifier is also described although this was not used in the final design due to the high insertion loss.
Keywords :
Ge-Si alloys; circuit tuning; equalisers; microwave oscillators; multilayers; phase noise; semiconductor device noise; semiconductor materials; varactors; voltage-controlled oscillators; wideband amplifiers; 100 kHz; 2 V; 3 to 6 GHz; 30 mA; SiGe; SiGe devices; VCO; active device; amplifier; broad tuning microwave oscillators; broadband negative group delay equaliser; insertion loss; multilayer technology; phase noise; phase shift; resonator; shunt inductors; silicon germanium transistor; transmission line; varactor diodes; voltage controlled oscillator; Couplings; Germanium silicon alloys; Microwave devices; Microwave oscillators; Microwave technology; Nonhomogeneous media; Phase noise; Silicon germanium; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 IEEE International
Print_ISBN :
0-7803-7688-9
DOI :
10.1109/FREQ.2003.1275128