Multistage tuning-tolerant equalizer filter with improved...

Details Multistage tuning-tolerant equalizer filter with improved... Multistage tuning-tolerant equalizer filter with improved...

2006-08-31

2009-12-15

Jones, Stephen E (Department: 2817)

Wave transmission lines and networks

Coupling networks

Equalizers

C375S229000

Reexamination Certificate

active

07633354

ABSTRACT:
The present invention provides an equalizer filter for compensating a received distorted signal for frequency dependent signal modifications introduced by a transmission channel, the received signal having an amplitude. The filter comprises at least one amplifying compensation stage having a gain and a saturation level, at least one limiting amplifier, and gain control means for controlling the gain of the at least one amplifying compensation stage, the gain control means comprising at least one comparator circuit comparing filtered input and output signals of the limiting amplifier, the at least one comparator circuit comprising a bias current source. The bias current source is adapted to deliver a variable current.

REFERENCES:
patent: 2002/0034221 (2002-03-01), Webster
patent: 1 392 001 (2004-02-01), None
patent: 1 447 950 (2004-08-01), None
patent: 1 622 285 (2006-02-01), None
Jong-Sang Choui et al., “A CMOS 3.5gbps continuous-time adaptive cable equalizer with joint adaptation method of low-frequency gain and high frequency boosting”, 2003 Symposium on VLSI Circuits, Digest of Technical Papers, Kyoto, Japan, Jun. 2003, pp. 103-106. (XP010651100).

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