Method and system for compensating for estimated distortion in a transmitter by utilizing a digital predistortion scheme with a quadrature feedback mixer configuration
First Claim
1. A system implemented in a single chip, comprising:
- a radio frequency (RF) receiver;
an RF transmitter, wherein the RF transmitter comprises a power amplifier configured to generate an output signal in response to an input signal;
a quadrature feedback mixer circuit comprising a feedback in-phase (I) mixer and a feedback quadrature-phase (Q) mixer, wherein the quadrature feedback mixer circuit is configured to perform a frequency downconversion operation on the output signal to generate a feedback signal; and
a plurality of selector switches configured by a baseband processor to insert the generated feedback signal at insertion points in the RF receiver during a calibration mode by configuring a closed feedback loop comprising the RF transmitter and a portion of the RF receiver defined by the insertion points.
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Accused Products
Abstract
Aspects of a method and system for compensating for estimated distortion in a transmitter by utilizing a digital predistortion scheme with a quadrature feedback mixer configuration are presented. Aspects of the system may include an RF transmitter that enables generation of an RF output signal in response to one or more generated input signals. One or more feedback signals may be generated by performing frequency downconversion on the RF output signal within a corresponding one or more feedback mixer circuits. The generated one or more feedback signals may be inserted at a corresponding one or more insertion points in an RF receiver. Each insertion point may be between a receiver mixer circuit and corresponding circuits that generate a baseband signal based on the corresponding one of the feedback signals.
8 Citations
22 Claims
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1. A system implemented in a single chip, comprising:
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a radio frequency (RF) receiver; an RF transmitter, wherein the RF transmitter comprises a power amplifier configured to generate an output signal in response to an input signal; a quadrature feedback mixer circuit comprising a feedback in-phase (I) mixer and a feedback quadrature-phase (Q) mixer, wherein the quadrature feedback mixer circuit is configured to perform a frequency downconversion operation on the output signal to generate a feedback signal; and a plurality of selector switches configured by a baseband processor to insert the generated feedback signal at insertion points in the RF receiver during a calibration mode by configuring a closed feedback loop comprising the RF transmitter and a portion of the RF receiver defined by the insertion points. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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in a single chip comprising a radio frequency (RF) receiver and an RF transmitter including a power amplifier, generating, with the power amplifier, an output signal in response to an input signal; generating, with a quadrature feedback mixer circuit, a feedback signal by performing a frequency downconversion operation on the output signal; and selectively inserting the feedback signal at insertion points in the RF receiver to characterize performance of the power amplifier by configuring a closed feedback loop comprising the RF transmitter and a portion of the RF receiver defined by the insertion points within the RF receiver. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A system implemented in a single chip, comprising:
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a radio frequency (RF) receiver; an RF transmitter, wherein the RF transmitter comprises a power amplifier configured to generate an output signal in response to an input signal; a quadrature feedback mixer circuit configured to perform a frequency downconversion operation on the output signal to generate a feedback signal; and a selection circuit in the RF receiver configured to insert the generated feedback signal at insertion points in the RF receiver during a calibration mode by configuring a closed feedback loop comprising the RF transmitter and a portion of the RF receiver defined by the insertion points. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification