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