A universal gyroscope driving circuit with 70dB amplitude control range

Mohamed A. Abdelghany, K. Khairallah, Mohannad Yomn Elsayed, Ahmed Emira, Sherif M. Sedky

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

A CMOS variable gain driving circuit with output signal amplitude control for gyroscopes with wide range of quality factors is presented. The driving circuit can be used for gyroscopes with Q values higher than 500. The circuit uses a current-commutating switching mixer to control the gyroscope driving signal level. Conventional driving circuits use automatic gain control (AGC) which suffers from limited linear range and the need for an off-chip capacitor for the peak detector and loop filter. Two stage variable gain amplifier is used in the proposed design to ensure enough gain for oscillation for such a wide range of quality factors. Analog and digital amplitude control methods are used to cover wide range of driving signal amplitude with enough accuracy to hit the maximum driving signal level without sacrificing gyroscope linearity. Due to the high DC gain of the amplifier chain, DC offset resulting from mismatches might saturate the amplifier output. DC offset correction is employed using a secondary negative feedback loop. The proposed driving circuit is being fabricated in 0.6μm CMOS technology. © 2010 IEEE.
Original languageEnglish (US)
Title of host publication2010 53rd IEEE International Midwest Symposium on Circuits and Systems
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages252-255
Number of pages4
ISBN (Print)9781424477715
DOIs
StatePublished - Aug 2010

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