Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1993-01-15
1994-06-28
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330 86, H03G 330
Patent
active
053250710
ABSTRACT:
A single chip operational amplifier wherein the gain is programmable by means of a digitally controlled feedback loop wherein the parameters of the feedback circuit are digitally programmable under control of a microprocessor, microcontroller, control logic and the like. There is provided an operational amplifier with a feedback loop from output terminal to input terminal. The feedback loop contains components which are switched into the feedback loop circuit under control of digital signal provided by an external device, such as, for example, a microprocessor, microcontroller, control logic and the like. The digital signals from the external device cause the appropriate resistors and/or capacitors and/or other components, as may be required, to be switched into the feedback loop of the operational amplifier to provide the desired gain. These digital signals can be derived from a monitoring source which is designed to provide automatic gain control (AGC) or the like.
REFERENCES:
patent: 4500845 (1985-02-01), Ehni
patent: 5233309 (1993-08-01), Spitalny et al.
Brady Wade James
Donaldson Richard L.
Mullins James B.
Texas Instruments Incorporated
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