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US 7,627,060 B2Granted
Receiver and method having envelope compensation signal
AssigneeIntel Corporation
InventorStewart S. Taylor
Life of this patent
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Abstract
In some embodiments, methods and apparatus to reduce nonlinearity in a receiver are generally described herein. Other embodiments may be described and claimed.
Claims23
An apparatus, comprising:
- a front-end circuitry to generate a baseband signal based at least in part on a received communication signal, with the baseband signal having a signal envelope reflecting at least one nonlinearity of the front-end circuitry, wherein the front-end circuitry includes:
- an amplifier to receive the received communication signal and to generate an amplified communication signal in response to the received communication signal, with the amplifier having the at least one nonlinearity, wherein the amplifier includes at least one amplifier transistor;
- and
- a mixer coupled to the amplifier to generate the baseband signal based in part on the amplified communication signal, wherein the mixer includes at least one mixer transistor;
- and
- a digital baseband circuitry, coupled to a gate of the transistor of a selected one of the amplifier and the mixer, to generate an envelope compensation signal based at least in part on the baseband signal and provide the envelope compensation signal to bias the selected one of the amplifier and the mixer to reduce the at least one nonlinearity.
3 more elements
A method, comprising:
- generating an amplified communication signal with an amplifier in a front-end circuitry in response to a received communication signal;
- generating a baseband signal with a mixer in the front-end circuitry based at least in part on the amplified communication signal, a received communication signal, with the baseband signal including a distortion caused by at least one nonlinearity of the front-end circuitry and the amplifier having the at least one nonlinearity;
- generating a nonlinearity compensation signal in a digital baseband circuitry based at least in part on the baseband signal;
- and
- feeding back the nonlinearity compensation signal to the front-end circuitry to reduce the distortion by biasing a selected one of the amplifier and the mixer with the nonlinearity compensation signal, wherein the biasing includes biasing a gate or drain of a transistor of the selected one of the amplifier and the mixer.
2 more elements
A system, comprising:
- at least one omnidirectional antenna to receive a communication signal;
- a front-end circuitry, coupled to the omnidirectional antenna, to generate a baseband signal based at least in part on the received communication signal, with the baseband signal having a signal envelope reflecting at least one nonlinearity of the front-end circuitry, wherein the front-end circuitry includes:
- an amplifier to receive the received communication signal and to generate an amplified communication signal in response to the received communication signal, with the amplifier having the at least one nonlinearity, wherein the amplifier includes at least one amplifier transistor;
- and
- a mixer coupled to the amplifier to generate the baseband signal based in part on the amplified communication signal, wherein the mixer includes at least one mixer transistor;
- and
- a digital baseband circuitry, coupled to a gate of the transistor of a selected one of the amplifier and the mixer, to generate an envelope compensation signal based at least in part on the baseband signal and provide the envelope compensation signal to bias the selected one of the amplifier and the mixer to reduce the at least one nonlinearity.
4 more elements
A machine-readable medium having instructions stored thereon that, when executed, cause a machine to perform operations comprising:
- generating an amplified communication signal with an amplifier in a front-end circuitry in response to a received communication signal;
- generating a baseband signal with a mixer in the front-end circuitry based at least in part on the amplified communication signal
- receiving the baseband signal outputted from the front-end circuitry, with the baseband signal including a distortion caused by at least one nonlinearity of the front-end circuitry, the amplifier having the at least one nonlinearity;
- generating a nonlinearity compensation signal based at least in part on the baseband signal;
- and
- outputting the nonlinearity compensation signal so that it may be fed back to the front-end circuitry to reduce the distortion by biasing a selected one of the amplifier and the mixer with the nonlinearity compensation signal, wherein the biasing includes biasing a gate or drain of a transistor of the selected one of the amplifier and the mixer.
3 more elements
An apparatus, comprising:
- a front-end circuitry to generate a baseband signal based at least in part on a received communication signal, with the baseband signal having a signal envelope reflecting at least one nonlinearity of the front-end circuitry, wherein the front-end circuitry includes:
- an amplifier to receive the received communication signal and to generate an amplified communication signal in response to the received communication signal, with the amplifier having the at least one nonlinearity, wherein the amplifier includes at least one amplifier transistor and an amplifier voltage supply coupled to an amplifier drain of the amplifier transistor;
- and
- a mixer coupled to the amplifier to generate the baseband signal based in part on the amplified communication signal, wherein the mixer includes at least one mixer transistor and a mixer voltage supply coupled to a mixer drain of the mixer transistor;
- and
- a digital baseband circuitry, coupled to the drain of the transistor of the selected one of the amplifier and the mixer, to generate an envelope compensation signal based at least in part on the baseband signal and provide the envelope compensation signal to bias a voltage of the drain of the selected one of the amplifier and the mixer to reduce the at least one nonlinearity.
3 more elements
Dependencies are inferred from the claim text.