Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1980-11-12
1983-04-19
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330138, 330279, H03G 320
Patent
active
043807372
ABSTRACT:
A fast slew rate automatic gain control circuit (10) includes a variable gain amplifier (14) which is responsive to a gain control signal and an amplitude detector (18) which produces an amplitude signal corresponding to the amplitude of the received signal transmitted through amplifier (14). The amplitude signal is provided to the input node of a loop filter (24) and to the inputs of threshold detectors (30, 32). Positive and negative slew threshold circuits (34, 38) provide threshold signals respectively for the threshold detector circuits (30, 32). When the amplitude signal is within the range of the threshold signals the loop filter produces the gain control as the function of the amplitude signal. When the amplitude signal is less than the positive slew threshold signal the threshold detector (32) produces a drive signal which is provided to the loop filter (24) and causes the generation of the gain control signal to have an accelerated positive slew rate which increases the gain. When the amplitude signal exceeds the negative slew threshold signal the threshold detector (30) produces a drive signal which is supplied to the loop filter (24). When the negative drive signal is supplied to the loop filter the gain control signal is generated with an accelerated negative slew rate which increases the gain. The slew rate of the gain control signal is thus a function of the amplitude of the received signal.
REFERENCES:
patent: 3879672 (1975-04-01), Milanes
Crowder, Jr. Albert M.
E-Systems Inc.
Mullins James B.
Wilder Robert V.
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