Automatic gain control circuit for burst signal communication sy

Details Automatic gain control circuit for burst signal communication sy Automatic gain control circuit for burst signal communication sy

1984-01-09

1986-02-11

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330138, 330279, 330280, H03G 320

Patent

active

045701270

ABSTRACT:
An AGC circuit for amplifying burst signals has output power which does not vary, regardless of variations in the burst time. This automatic gain control (AGC) circuit has an amplifier for receiving a burst signal input and providing an amplified burst output. The level of amplification is controlled in response to a control signal applied to the amplifier. A negative feedback circuit includes an envelope detector for receiving the burst output and a circuit for providing a comparison signal in response to a comparison between the voltage leads of the detected envelope signal and a reference voltage. The comparison signal is converted into a binary signal which is counted down to provide the amplifier control signal.

REFERENCES:
".mu. PB 74LS 123C, Dual Retriggerable Monostable Multivibrators with Clear", Los Power Schottky TTL .mu. PB 74LS Series, pp. 107-109, Published 1981.
".mu. PB 74LS 193C, Binary Up/Down Counter", Los Power Schottky TTL .mu. PB 74LS Series, pp. 172-174, Published 1981.
Texas Instruments Catalog Sheets SN54122 and SN54192, The TTL Data Book for Design Engineers (Second edition), pp. 6-76-6-81, 7-306-7-310, and 7-314, 7-315.

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