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research article
LC-VCO Design With Dual-Gm, Boosted for RF Oscillation and Attenuated for LF Noise
A VCO topology with a high gm at RF and low gm at low frequencies (LF) is presented. A high gm(RF) improves start-up conditions, and a low gm(LF) enables a significant improvement of the phase noise and the power supply rejection. The VCO with a modified prescaler was implemented in 0.25 mu m CMOS technology. The measured phase is -128.5 dBc/Hz at 1 MH offset, when the VCO works at 3 GHz and consumes 7.5 mW. The corresponding figure of merit is 189.2 dBc/Hz/mW.
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Type
research article
Web of Science ID
WOS:000285060400011
Authors
Publication date
2010
Published in
Volume
20
Start page
675
End page
677
Peer reviewed
REVIEWED
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December 16, 2011