Demodulators – Pulse or interrupted continuous wave demodulator
Patent
1994-09-13
1995-11-21
Grimm, Siegfried H.
Demodulators
Pulse or interrupted continuous wave demodulator
329347, 360 7708, G11B 5596, H03D 102
Patent
active
054691133
ABSTRACT:
A servo system for controlling the position of a read/write head in a disk drive is provided. The servo system includes two input terminals for sequentially receiving a plurality of input signal AC voltage bursts of a burst pattern, wherein the input signal bursts include positional information of the head. Demodulation circuitry, coupled to the input terminals, sequentially demodulates each input signal burst and provides a demodulated signal for each burst. The demodulation circuitry includes translation circuitry, coupled to the input, for sequentially translating each input voltage burst to a translated current. A rectifier circuit, coupled to the translation circuitry, including an absolute value circuit and a current mirror circuit, sequentially rectifies each translated current and produces a driving signal. An integrator, coupled to the rectifier circuit, sequentially integrates each driving signal. The integrator includes an integration capacitor which is sequentially charged by each driving signal. In the preferred embodiment, the current mirror circuit includes an operational amplifier and a gain circuit. Also in the preferred embodiment, the voltage to current translation circuit includes a folded cascode circuit arrangement of a plurality of CMOS transistors.
REFERENCES:
patent: 4766508 (1988-08-01), Mathewson
patent: 4910616 (1990-03-01), Sirai et al.
patent: 4990916 (1991-02-01), Wynne et al.
Yager, C., "Trim head-positioning overhead with embedded disk servo", Electronic Design, pp. 83-90, Aug. 25, 1988.
Craninckx Jan
Dehaene Wim
Real Peter
Steyaert Michel
Walsh Mairtin
Analog Devices Inc.
Grimm Siegfried H.
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