Pulse or digital communications – Receivers – Automatic gain control
Patent
1994-03-02
1997-02-04
Chin, Stephen
Pulse or digital communications
Receivers
Automatic gain control
375316, 4552341, H04L 2708
Patent
active
056006810
ABSTRACT:
With this method and equipment the sensitivity of receivers, whose gain control criterion is a constant noise signal level, can be controlled independently of the received data signal, so that the reception of long datastreams is possible. For this purpose a diode (D1) is provided, whose anode is connected to a voltage source, and whose cathode is connected with a current source (Q4) and with the cathode of a second diode (D2) whose anode is connected to a capacitor (C12). A voltage is applied across the capacitor (C12) which is smaller in the rest state than a second voltage applied via the first diode (D1), so that the second diode (D2) is reverse-biased. After reception of a data signal a discharge pulse (EP) is generated dependent on an output of a signal detector, through which the second voltage is reduced to a value that is smaller than the first voltage. In this way the capacitor (C12) is discharged to an extent such that the charge removed corresponds to the charge given to the capacitor (C12) during reception of a data signal.
REFERENCES:
patent: 3671867 (1972-06-01), Schwarz
patent: 3898380 (1975-08-01), Wilcox
patent: 3936599 (1976-02-01), Peil et al.
Chin Stephen
Ghebretinsae T.
Gut Max B.
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