Method and system for compensating for distortion in a transmitter by utilizing a digital predistortion scheme with a feedback mixer configuration
First Claim
1. A system, comprising:
- a radio frequency (RF) receiver;
an RF transmitter configured to generate an output signal;
a feedback in-phase (I) mixer configured to perform a frequency downconversion operation on the output signal to generate an I component feedback signal;
a feedback quadrature-phase (Q) mixer configured to perform a frequency downconversion operation on the output signal to generate a Q component feedback signal; and
switching circuitry configured to insert the I component feedback signal and the Q component feedback signal at an insertion point in the RF receiver.
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Accused Products
Abstract
Aspects of a method and system for compensating for distortion in a transmitter by utilizing a digital predistortion scheme with a 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.
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Citations
20 Claims
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1. A system, comprising:
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a radio frequency (RF) receiver; an RF transmitter configured to generate an output signal; a feedback in-phase (I) mixer configured to perform a frequency downconversion operation on the output signal to generate an I component feedback signal; a feedback quadrature-phase (Q) mixer configured to perform a frequency downconversion operation on the output signal to generate a Q component feedback signal; and switching circuitry configured to insert the I component feedback signal and the Q component feedback signal at an insertion point in the RF receiver. - View Dependent Claims (2, 3, 4)
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5. A method in a radio frequency (RF) transceiver, comprising:
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generating, with a power amplifier of an RF transmitter, an output signal in response to an input signal; generating, with an in-phase (I) feedback mixer, an I component feedback signal by performing a frequency downconversion operation on the output signal; generating, with a quadrature-phase (Q) mixer, a Q component feedback signal by performing a frequency downconversion operation on the output signal; and selectively inserting the I component feedback signal and the Q component feedback signal at an insertion point in an RF receiver. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A system, comprising:
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a radio frequency (RF) receiver; an RF transmitter comprising a power amplifier configured to generate an output signal in response to an input signal; a feedback mixer circuit configured to perform a frequency downconversion operation on the output signal to generate a feedback signal; and a selection circuit configured to uncouple a portion of the RF receiver and insert the feedback signal at an insertion point in the RF receiver by configuring a closed feedback loop comprising the RF transmitter and at least a portion of the RF receiver. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification