Title:
FEEDBACK DELAY REDUCTION IN FORCE FEEDBACK DEVICES
Document Type and Number:
WIPO Patent Application WO/2015/189150
Kind Code:
A3
Abstract:
A feedback circuit provides a feedback signal to a transducer. The feedback circuit includes an ADC that generates digital representations of a feedback signal, digital controller that identifies adjustments for the feedback, and DAC that generates an analog output of the adjusted feedback signal. The digital controller performs speculative computation to identify adjustments for the feedback signal output for each output value from the ADC prior to receiving the output from the ADC. The ADC and DAC include sigma-delta modulators that operate with a zero clock cycle delay in a forward path. The ADC, digital controller, and DAC generate adjustments to the feedback output signal with reduced delay that reduce phase lag and improve phase margin to maintain stability in the transducer.
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Inventors:
BALACHANDRAN GANESH (US)
PETKOV VLADIMIR (US)
PETKOV VLADIMIR (US)
Application Number:
PCT/EP2015/062711
Publication Date:
February 04, 2016
Filing Date:
June 08, 2015
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
International Classes:
H03M3/00
Domestic Patent References:
| WO2000051240A1 | 2000-08-31 |
Other References:
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JARNO SALOMAA ET AL: "A [Delta][Sigma] ADC for low power sensor applications", IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS. ISCAS 2010 - 30 MAY-2 JUNE 2010 - PARIS, FRANCE, IEEE, US, 30 May 2010 (2010-05-30), pages 3100 - 3103, XP031725200, ISBN: 978-1-4244-5308-5
COLBECK R P ET AL: "A SINGLE-CHIP 2B1Q 1-INTERFACE TRANSCEIVER", IEEE JOURNAL OF SOLID-STATE CIRCUITS, IEEE SERVICE CENTER, PISCATAWAY, NJ, USA, vol. 24, no. 6, December 1989 (1989-12-01), pages 1614 - 1624, XP000100493, ISSN: 0018-9200, DOI: 10.1109/4.44997
RAJARSHI PAUL ET AL: "Adaptive non-inverting buck-boost IC with on-chip sigma-delta ADC for portable applications", CONTROL AND MODELING FOR POWER ELECTRONICS (COMPEL), 2010 IEEE 12TH WORKSHOP ON, IEEE, PISCATAWAY, NJ, USA, 28 June 2010 (2010-06-28), pages 1 - 6, XP031746327, ISBN: 978-1-4244-7462-2
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