Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Reissue Patent
2008-01-29
2008-01-29
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
C375S345000, C455S234100, C327S307000, C327S312000
Reissue Patent
active
10959947
ABSTRACT:
A method and apparatus for avoiding and or recovering from the latch-up condition in a quantized feedback DC restorer circuit for use in a digital data communication system receiver. An automatic gain control (AGC) circuit controls the level of the received data by comparing the AGC output with a quantized output signal from the DC restorer. A carrier detect circuit detects the presence of data transitions in the quantized output signal, and in the absence of such transitions continuously ramps up the gain of the AGC until such transitions are detected. The carrier detect circuit can be further used to disable, either entirely or partially, the positive feedback path of the DC restorer in the absence of transition in the quantized output signal. The present invention further provides an inherent muting function of the DC restorer output signal in the absence of valid data transitions.
REFERENCES:
patent: 4513320 (1985-04-01), Reneau et al.
patent: 5315270 (1994-05-01), Leonowich
patent: 5424881 (1995-06-01), Behrens et al.
patent: 5426389 (1995-06-01), Webster
patent: 5991107 (1999-11-01), Behrens et al.
patent: 6002717 (1999-12-01), Gaudet
patent: 6118815 (2000-09-01), Hirth et al.
patent: 6204787 (2001-03-01), Baird
patent: 0 320 022 (1989-06-01), None
patent: 0 393 633 (1990-10-01), None
patent: WO 98 45955 (1998-10-01), None
Baker, A.J.,: “An Adaptive Casble Equalizer for Serial Digital Video Rates to 400 Mb/s”, IEEE ISSCC, pp. 174-175, (1996).
Gabara, T.J. et al., “Captive Coupling and Quantized Feedback Applied to Conventional CMOS Technology”, IEEE Journal of Solid-State Circuits, vol. 32, No. 3, Mar. 1, 1997, pp. 419-427, New York, U.S.A.
Bereskin & Parr
Gennum Corporation
Ha Dac V.
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