Equalizer

Details Equalizer Equalizer

2006-12-26

2006-12-26

Deppe, Betsy L. (Department: 2611)

Pulse or digital communications

Equalizers

C375S257000, C333S02800T

Reexamination Certificate

active

07154945

ABSTRACT:
A method and an equalizer circuit equalize signals transmitted on a line having an attenuation. The equalizer circuit includes: an analogical adaptive filter applied in series with the line and includes plural transconductance filters each having a bias current. The adaptive filter has a pole and a zero each having a frequency position in the working band that is variable in response to the bias current. The equalizer circuit includes a retroaction circuit applied to the output of the filter and able to vary the bias current according to the varying of the attenuation of the line. The bias current of the transconductance filters has a prefixed value and is made to vary at the increasing of the attenuation so that the pole is moved toward high frequencies and the zero is moved toward low frequencies.

REFERENCES:
patent: 4273963 (1981-06-01), Seidel
patent: 5257286 (1993-10-01), Ray
patent: 5699022 (1997-12-01), Tovar
patent: 5805031 (1998-09-01), Cheng
patent: 5940441 (1999-08-01), Cranford et al.
patent: 5978417 (1999-11-01), Baker et al.
patent: 6240131 (2001-05-01), Cheng et al.

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