Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1985-12-05
1987-06-02
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330279, 330284, H03G 320
Patent
active
046707190
ABSTRACT:
An automatic gain control circuit includes a gain controllable amplifier, a sampling circuit sampling the output of the amplifier, a rewritable memory storing a contrast digital value, an analog/digital converter converting the sampled signal into a digital signal, a comparator comparing the digital signal with the contrast digital value and producing a comparator output when the digital signal and the contrast digital value are a predetermined relationship, the memory changing the storing content with the digital signal as a new contrast digital value in response to the comparator output, a digital/analog converter converting the contrast digital value into an analog value to be applied to the amplifier to produce a constant level output from the amplifier. The automatic gain control circuit may include a first counter and a second counter to determine the attack time and the recovery time.
Mullins James B.
NEC Corporation
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