Adaptive line equalizer

Details Adaptive line equalizer Adaptive line equalizer

1996-11-26

1998-06-09

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

3647242, 4552341, 4552451, H03H 730, H03H 740

Patent

active

057646953

ABSTRACT:
An adaptive equalizer capable of providing compensation for a wide range of cables having different cable characteristics and different cable lengths. The adaptive equalizer comprises a programmable gain amplifier capable of providing a variable amplification factor in response to a feedback control signal. The gain amplifier is configured to receive pulse signals transmitted over a communication channel. A peak detecting equalizer is coupled to the gain amplifier so as to receive its output signals. A pulse shape detector is adapted to receive pulse signals provided by the peak detecting equalizer, and generate a first indication signal indicating over-equalization and a second indication signal indicating under-equalization. A gain control circuit receives the first and second indication signals to provide the feedback control signal to the programmable gain amplifier so as to vary its amplification factor.

REFERENCES:
patent: 4707840 (1987-11-01), Nakayama
patent: 5337025 (1994-08-01), Polhemus

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