Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1991-04-26
1992-06-23
Gensler, Paul
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
375 12, H04B 304
Patent
active
051246732
ABSTRACT:
A multiple section cable equalizer with a signal level detector produces a clipping control signal for amplifiers in each equalizer section, so that a variable level input signal is restored to an equalized output signal that is free of distortion and attendant bit errors. A fixed reference clipping stage after the last equalizing stage produces a signal clipped to a final output level. A feedback path restores DC and low frequencies lost due to AC coupling. A test output stage permits monitoring of the operation of the equalizer stages. The signal level detector contains (in series), a differential amplifier with low pass filtering, a balanced modulator detector, a voltage amplifier, a comparator and peak detector, a transconductance amplifier and a plurality of current mirrors operatively connected to determine a difference current from the output of the transconductance amplifier and convert this to a clipping control signal voltage level. A defeat comparator monitors the output of the comparator and peak detector and replaces the variable difference current with a fixed reference current when an external capacitor used by the peak detector appears to be shorted.
REFERENCES:
patent: 3529244 (1970-09-01), Torick et al.
patent: 3568100 (1971-03-01), Tarbox
patent: 3812436 (1974-05-01), Fudemoto et al.
patent: 4606043 (1986-08-01), Aprille, Jr. et al.
Gensler Paul
Griffith Boulden G.
The Grass Valley Group Inc.
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