Discrete-gain output limiter

Details Discrete-gain output limiter Discrete-gain output limiter

1976-09-22

1978-01-24

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330136, 330144, H03F 136, H03G 320

Patent

active

040706320

ABSTRACT:
An improved gain control circuit for an amplifier having a plurality of parallel connected resistors each having a series switch to selectively switch the resistor into the control circuit to vary the gain incrementally as some continuous function of amplifier input voltage. In one embodiment, the parallel resistors are connected between the amplifier input and output. Alternatively, the parallel resistors may be connected as the amplifier input resistance. A peak follower circuit monitors the amplifier input and applies an output control voltage to a plurality of comparators each having a separate reference voltage. Each comparator generates an output signal when the control voltage exceeds its associated reference and this output is connected to one of the resistor switches to change the parallel resistance incrementally generating a corresponding incremental gain variation. In an alternative embodiment, the comparator outputs are connected to data flip flops having complementary outputs triggered by pulses from a clock pulse circuit. The pulse circuit generates a pulse upon each zero crossing of the amplifier input so that incremental gain changes occur only at zero crossings of the amplifier input.

REFERENCES:
patent: 2930987 (1960-03-01), Groce et al.
patent: 3158818 (1964-11-01), Plumpe
patent: 3315223 (1967-04-01), Hibbard et al.
patent: 3392370 (1968-07-01), Neitzel
patent: 3464022 (1969-08-01), Locheed et al.
patent: 3579138 (1971-05-01), Harris et al.
patent: 3699948 (1972-10-01), Ota et al.
patent: 3879672 (1975-04-01), Milanes
patent: 3969683 (1976-07-01), Fabricius

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