Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2005-08-09
2005-08-09
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S281000
Reexamination Certificate
active
06927632
ABSTRACT:
A low distortion compression amplifier comprising an amplifier circuit having an input and an output, wherein an input signal is received at the input and amplified in accordance with a gain to form an output signal at the output. The amplifier circuit further comprises a comparator circuit operable to receive the output signal and generate a first control signal in response thereto. A digital gain control circuit is coupled to the amplifier circuit, and is operable to generate a digital gain control signal based at least in part on the first control signal. The gain control signal is then employed to modulate the gain of the amplifier circuit in a digital fashion. The invention also comprises a method of digitally controlling a gain associated with an amplifier circuit. The method comprises comparing an output signal to a threshold and modulating the gain in a digital fashion, wherein the gain is modulated up in a plurality of rates or down in a plurality of rates in response to the comparison.
REFERENCES:
patent: 4360787 (1982-11-01), Galpin
patent: 5404115 (1995-04-01), Johnson
patent: 5862238 (1999-01-01), Agnew et al.
patent: 5903655 (1999-05-01), Salmi et al.
patent: 6256395 (2001-07-01), Melanson
“FETs As Voltage-Controlled Resistors”, AN105,Sillconix, Mar. 10, 1997, 6 pgs.
Fattaruso John W.
Gata Daramana G.
Sjursen Walter Paul
Brady W. James
Mottola Steven J.
Swayze, Jr. W. Daniel
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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