Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1981-07-31
1984-01-31
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330294, 330109, H03G 310, H03F 134
Patent
active
044292856
ABSTRACT:
One aspect of the invention includes an automatic gain control system (AGC) having a frequency controlled variable gain amplifier stage whose stage gain is a function of a frequency signal applied to a gain control input of the amplifier stage. An input signal to be processed is applied to an input of the amplifier stage. The output of the amplifier is sensed and compared to a reference potential to produce a frequency signal which is applied to the gain control input of the amplifier. Another aspect of the invention includes a frequency controlled variable gain amplifier embodying the invention comprised of an amplifier means having input and feedback networks and whose voltage gain is a function of the impedance of the feedback network with an impedance of the input network. The value of at least one of the feedback and input impedances is varied as a function of an applied sampling frequency signal and the voltage gain of the amplifier is controlled by varying the frequency applied to the feedback and input impedance network whose impedance varies as a function or frequency.
REFERENCES:
patent: 3375447 (1968-03-01), Beek
patent: 4331894 (1982-05-01), Gregorian et al.
B. J. Hosticka, "Novel Dynamic CMOS Amplifier for Switched-Capacitor Integrators", Electronics Letters, Aug. 16, 1979, vol. 15 No. 17.
"Sampled Analog Filtering Using Switched Capacitor as Resistor Equivalents", Caves et al., IEEE Journal of Solid State Circuits, vol. SC12, No. 6, Dec. 1977.
Mullins James B.
RCA Corporation
Schanzer Henry I.
Tripoli Joseph S.
Wan Gene
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