Sampled data automatic gain control

Details Sampled data automatic gain control Sampled data automatic gain control

1995-12-21

1997-06-24

Mottola, Steven J.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330279, H03G 330

Patent

active

056420757

ABSTRACT:
An amplifier circuit employing automatic gain control (AGC), with the gain responsive to a varying input signal level, and particularly adapted for manufacture as an integrated circuit. In a preferred embodiment, an error voltage is produced which is indicative of the difference between the RMS output voltage of the amplifier and a target RMS voltage. A ramp generator generates a ramp voltage in accordance with a digital count generated by a ripple counter. A comparator then produces a control signal in accordance with the difference between the ramp voltage and the error voltage. When the control signal is indicative of the amplifier output voltage differing from the target voltage, the gain is updated in accordance with the digital count and the count and ramp voltage are reset.

REFERENCES:
patent: 4360787 (1982-11-01), Galpin
patent: 5504457 (1996-04-01), Jenen
"Solution AGC", by F. Baumbartner, 73 Amateur Radio, Sep. 1990.
"Automatic Conditioning of Speech Signals":, by G. Hellworth et al., IEEE Transactions on Audio and Electroacoustics, vol. AU-16, No. 2, Jun. 1986.

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