Programmable automatic cable equalizer

Details Programmable automatic cable equalizer Programmable automatic cable equalizer

1984-10-09

1986-08-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

178 69R, 333 18, H04B 314

Patent

active

046060430

ABSTRACT:
The circuit (10) has a gain section which includes a first AGC circuit (12). The output of the gain section goes to a signal shaping section which includes a biquadratic filter (24), a summer (45), and a second AGC circuit (40). The two AGC circuits (12,40) are controlled by respective separate peak detectors (20, 50) and are noninteracting. For "short" cables, only the first AGC circuit (12) is active. For "long" cables, the first AGC circuit (12) is set at its gain breakpoint and the second AGC circuit (40) alone has active control. The shaping section includes a biquadratic filter (24) which is a tandem arrangement of a low-pass filter (26), an inverter (28), and an integrator (32). The low pass output (35) of the integrator (32) is connected to the noninverting (+) input of the a summing amplifier (45). The input (42) of the second AGC circuit (40) is connected to the band pass output (33) of the inverter (28), while its output (44) is connected to the inverting input (-) of the summing amplifier (45). The input of the second peak detector (50) is connected to the output (48) of the summing amplifier (45) and its output is connected to the control node (52) of the second AGC circuit (40). Operational amplifiers (G1,G2,G3,G4) of the first peak detector (20), the low-pass filter (26), the integrator (32), and the summing amplifier (45) are designed to be programmable by means of decoders (22, 36, 38, 46) to permit the equalizer (10) to accommodate different data rates.

REFERENCES:
patent: 3568100 (1971-03-01), Tarbox
patent: 3652952 (1972-03-01), Chen
patent: 3824501 (1974-07-01), Harris
patent: 3857048 (1974-12-01), Meux et al.
patent: 4063183 (1977-12-01), Evans
patent: 4525684 (1985-06-01), Majefski
"New Line Driver and Line Receiver for DDS Local Distribution", Technical Memorandum, Oct. 12, 1978, W. D. Farmer.

Affiliated with

Also associated with

Rating

Programmable automatic cable equalizer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Programmable automatic cable equalizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable automatic cable equalizer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1948125