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US 5,473,279 AGranted
Integrated compander amplifier circuit with digitally controlled gain
AssigneeDallas Semiconductor Corporation
InventorsKevin P. D'Angelo, Francis A. Scherpenberg
Life of this patent
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Abstract
An integrate circuit companding amplifier for analog signals with digitally controlled gain. The expansion amplifier uses a square law with presentation of sign and the compression amplifier uses the inverse (square root law with preservation of sign). A digital potentiometer determines the gain, and peak detection plus feedback control of the potentiometer provides for automatic gain control. Three wire communication can program a fixed gain.
Claims43
A companding integrated circuit, comprising:
- (a) analog compression circuitry to compress a first inputted signal;
- (b) analog expansion circuitry to expand a second inputted signal;
- (c) a first gain control coupled to said compression circuitry to condition said first inputted signal, analog signal for said analog compression circuitry;
- and
- (d) a second gain control coupled to said expansion circuitry to condition said second inputted signal for said analog expansion circuitry;
- (e) wherein said first and second gain controls are programmable.
3 more elements
A compander integrated circuit, comprising:
- (a) analog compression circuitry to compress a first inputted signal;
- (b) analog expansion circuitry to expand a second inputted signal;
- (c) a first gain control coupled to said compression circuitry to condition said first inputted signal for said analog compression circuitry;
- and
- (d) a second gain control coupled to said expansion circuitry to condition said second inputted signal for said analog expansion circuitry.
2 more elements
An integrated circuit, comprising:
- (a) analog compression circuitry to compress a first inputted signal;
- and
- (b) a first gain control coupled to said compression circuitry to condition said first inputted signal for said analog compression circuitry
- (c) wherein said first gain control is programmable by a second inputted signal.
1 more element
Dependencies are inferred from the claim text.