Servo system, apparatus comprising a servo system, sigma...

Details Servo system, apparatus comprising a servo system, sigma... Servo system, apparatus comprising a servo system, sigma...

2006-05-16

2006-05-16

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Phase or time of phase change

Synchro or resolver signal

C341S143000, C341S142000

Reexamination Certificate

active

07046177

ABSTRACT:
A servo system comprising an analog sigma delta modulator for generating a normalized digital error correction signal from first and second analog control signals. The sigma delta modulator comprises an analog low-pass filter, a quantizer delivering the digital error correction signal and a multiplying DA-converter in feedback arrangement between the output of the quantizer and the input of the low-pass filter for multiplying the feedback signals with the sum of the analog control signals.

REFERENCES:
patent: 3662379 (1972-05-01), Miller et al.
patent: 4511884 (1985-04-01), Serev et al.
patent: 6426712 (2002-07-01), Hare et al.
patent: 6741199 (2004-05-01), Gartner et al.
patent: 6744230 (2004-06-01), Hill et al.
patent: 0 501 570 (1992-09-01), None

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