Pulse or digital communications – Repeaters – Testing
Patent
1993-02-01
1994-03-22
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
4552341, H04L 2708
Patent
active
052971848
ABSTRACT:
A mixed analog and digital gain control circuit for controlling the amplitude of an analog input signal. The circuit has a variable gain amplifier that receives the signal from a read/write recording head preamplifier. The output of the variable gain amplifier is connected through a multiplexer and equalizer to an analog to digital converter for converting the analog signal to digital sample values at controlled sampling times. A gain control circuit receives the digital values and the output of a pulse detector indicating when a pulse has occurred. A gain error detector within the gain control circuit determines the amount of error in the amplitude of each detected pulse, and this error amount is filtered and sent through a digital to analog converter and then through an exponentiating circuit. The output of the exponentiating circuit is connected to a gain control input of the variable gain amplifier.
REFERENCES:
patent: 4625240 (1986-11-01), Yarlonski et al.
patent: 4634896 (1987-01-01), Shrinkle
patent: 4750058 (1988-06-01), Hirt et al.
patent: 4829593 (1989-05-01), Hara
patent: 4864244 (1989-09-01), Sasaki
patent: 5184349 (1993-02-01), Riordan
Cideciyan et al., "A PRML System for Digital Magnetic Recording", IEEE Journal on Selected Areas in Communications, vol. 10, No. 1, Jan. 1992.
Kato et al., "An Adaptive Equalizer for R-DAT", IEEE Transactions on Consumer Electronics, vol. 35, No. 3, Aug. 1989.
Hong et al., "An Experimental 180 Mb/sec PRML Channel for Magnetic Recording", IEEE Transactions on Magnetics, vol. 27, No. 6, Nov. 1991.
Schmerbeck et al., "A 27MHz Mixed Analog/Digital Magnetic Recording Channel DSP Using Partial Response Signalling with maximum Likelihood Detection", IEEE International Solid State Circuits Conference, 1991.
Howell et al., "Error Rate Performance of Experimental Gigabit per Square Inch Recording Components", IBM Research Report, Mar. 1990.
Coker et al., "Implementation of PRML in a Rigid Disk Drive", IEEE Trnasactions on Magnetics, vol. 27, No. 6, Nov. 1991.
Behrens Richard T.
Dudley Trent
Glover Neal
Chin Stephen
Cirrus Logic Inc.
Young James R.
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