An active guarding technique for substrate noise suppression on LC-tank oscillators

Hao Ming Chao*, Kuei-Ann Wen, Michiel Steyaert

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

An active guarding technique is demonstrated for substrate immunity improvement on LC-tank oscillators. Active components in the oscillator, which are sensitive to substrate noise and contribute to the output most, are guarded from the substrate perturbation by applying the active guarding circuit to decouple and also compensate the noise current. To evaluate the effectiveness of the proposed technique, noise signals of both single and multiple tones of various frequencies are injected to the substrate close to the guarded transistors and measure the sideband spurs by switching the active guarding circuit on/off respectively. Experimental results showed more than 11 dB noise suppression performances can be achieved in a wide frequency range from DC to 10 GHz. By applying the active guarding circuit to a LC-tank oscillator, more than 17 dB spur suppression performance is obtained in the frequency range of interest.

Original languageEnglish
Title of host publication2011 Proceedings of Technical Papers
Subtitle of host publicationIEEE Asian Solid-State Circuits Conference 2011, A-SSCC 2011
Pages385-388
Number of pages4
DOIs
StatePublished - 1 Dec 2011
Event7th IEEE Asian Solid-State Circuits Conference, A-SSCC 2011 - Jeju, Korea, Republic of
Duration: 14 Nov 201116 Nov 2011

Publication series

Name2011 Proceedings of Technical Papers: IEEE Asian Solid-State Circuits Conference 2011, A-SSCC 2011

Conference

Conference7th IEEE Asian Solid-State Circuits Conference, A-SSCC 2011
CountryKorea, Republic of
CityJeju
Period14/11/1116/11/11

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