H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/04 (2006.01) H03G 3/20 (2006.01) H04B 3/14 (2006.01) H04L 25/06 (2006.01) H04L 25/08 (2006.01)
Patent
CA 2063350
29 Abstract of the Disclosure A multiple section cable equalizer with a signal level detector (700-800) produces a clipping control signal (4) for amplifiers in each equalizer section (200,220,240), so that a variable level input signal (5,6) is restored to an equalized output signal (87,88) that is free of distortion and attendant bit errors. A fixed reference clipping stage (300) after the last equalizing stage (240) produces a signal clipped to a final output level. A feedback path (500,600) restores DC and low frequencies lost due to AC coupling. A test output stage (400) permits monitoring (110,111) of the operation of the equalizer stages (200,220,240). The signal level detector contains (in series), a differential amplifier (700) with low pass filtering (R22,C1,R18), a balanced modula- tor detector (710), a voltage amplifier (720), a comparator and peak detector (730,CX4), a transcon- ductance amplifier (740) and a plurality of current mirrors (750,760,770,800) operatively connected to determine a difference current (59) from the output (48,49) of the transconductance amplifier (740) and convert this to a clipping control signal (4) voltage level. A defeat comparator (790) monitors the output (37) of the comparator and peak detector (790) and replaces the variable difference current (59) with a fixed reference current (800) when an external capacitor (CX4) used by the peak detector (730) appears to be shorted.
Grass Valley Group Inc. (the)
Hershberger David L.
Kirby Eades Gale Baker
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