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US 2006/0125562 A1Published application
Variable gain amplifiers systems and methods
AssigneeSkyworks Solutions, Inc.
InventorTirdad Sowlati
Life of this patent
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Abstract
A system for controlling gain in a polar loop is disclosed. Embodiments of the invention provide for a substantially constant gain tolerant of changes in supply voltage, ambient temperature, and/or manufacturing process.
Claims28
A method of providing direct current (DC) control voltages that operate in opposing manner, the method comprising:
- receiving a DC shifted voltage, a differential emitter voltage, and a differential collector voltage;
- imposing the differential emitter and collector voltages through a respective RC network to provide an emitter common mode voltage and a collector common mode voltage, respectively;
- combining the DC shifted voltage and the emitter common mode voltage to provide a first reference voltage;
- combining the DC shifted voltage and the collector common mode voltage to provide a second reference voltage;
- receiving a differential control voltage at a first terminal and a second terminal;
- combining the first reference voltage and the differential control voltage corresponding to the second terminal to provide a first result;
- combining the second reference voltage and the differential control voltage corresponding to the first terminal to provide a second result;
- subtracting the differential control voltage corresponding to the first terminal from the first result to provide a first DC control voltage;
- and
- subtracting the differential control voltage corresponding to the second terminal from the second result to provide a second DC control voltage that operates in opposing manner to the first DC control voltage.
7 more elements
A system that provides direct current (DC) control voltages that operate in opposing manner, the system comprising:
- a first control system, comprising:
- means for receiving a differential emitter voltage and a differential collector voltage;
- means for providing an emitter common mode voltage based on the differential emitter voltage;
- means for providing a collector common mode voltage based on the differential collector voltage;
- means for providing a first reference voltage based on a DC shifted voltage and the emitter common mode voltage;
- means for providing a second reference voltage based on the DC shifted voltage and the collector common mode voltage;
- means for receiving a differential control voltage at a first terminal and a second terminal;
- means for:
- providing a first result based on the first reference voltage and the differential control voltage corresponding to the second terminal;
- and
- providing a first DC control voltage based on the differential control voltage corresponding to the first terminal and the first result;
- and
- means for:
- providing a second result based on the second reference voltage and the differential control voltage corresponding to the first terminal;
- and
- providing a second DC control voltage that operates in opposing manner to the first DC control voltage based on the differential control voltage corresponding to the second terminal and the second result.
13 more elements
A closed-loop system, comprising:
- a first variable gain amplifier comprising means for providing a first gain variation as a function of an imposed differential input control voltage;
- and
- a second variable gain amplifier coupled to the first variable gain amplifier, the second variable gain amplifier comprising means for providing a second gain variation that is substantially symmetrical to the first gain variation.
A method of providing direct current (DC) control voltages that operate in opposing manner, the method comprising:
- producing a first control voltage based on an emitter common mode voltage, a DC shifted voltage, and a differential control voltage;
- and
- producing a second control voltage that operates in opposing manner to the first DC control voltage based on a collector common mode voltage, the DC shifted voltage, and the differential control voltage.
A system that provides direct current (DC) control voltages that operate in opposing manner, the system comprising:
- means for producing a first control voltage based on an emitter common mode voltage, a DC shifted voltage, and a differential control voltage;
- and
- means for producing a second control voltage that operates in opposing manner to the first DC control voltage based on a collector common mode voltage, the DC shifted voltage, and the differential control voltage.
Dependencies are inferred from the claim text.