Self calibrating receive path correction system in a receiver
First Claim
1. A receiver for receiving a radio frequency signal, the receiver having a self-calibrating receive path correction system for correction of an I/Q gain imbalance and an I/Q phase imbalance in the radio frequency signal, the receiver comprising:
- a signal-processing block for processing the received radio frequency signal, thereby producing an unequalized I-signal and an unequalized Q-signal, wherein the signal processing block includes digital offset correction during the processing of the received radio frequency signal;
an I/Q phase imbalance detection and correction circuit coupled to the signal-processing block for equalizing a phase of the unequalized I-signal and a phase of the unequalized Q-signal, thereby producing a phase equalized I-signal and a phase equalized Q-signal;
an I/Q gain imbalance detection and correction circuit coupled to the I/Q phase imbalance detection and correction circuit for equalizing a gain of the phase equalized I-signal and a gain of the phase equalized Q-signal, thereby producing an I-image signal and a Q-image signal;
an adaptive loop bandwidth control circuit coupled to the I/Q phase imbalance detection and correction circuit and to the I/Q gain imbalance detection and correction circuit for dynamically adjusting at least one loop bandwidth for the I/Q gain imbalance detection and correction circuit and the I/Q phase imbalance detection and correction circuit on at least one slot boundary; and
wherein an at least one PN training signal is used for a self-calibration of the I/Q phase imbalance detection and correction circuit and the I/Q gain imbalance detection and correction circuit during a warm-up sequence to compensate for imbalances due to the signal-processing block.
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Accused Products
Abstract
A receiver (50) includes a self-calibrating receive path correction system for correction of I/Q gain and phase imbalances in a radio frequency signal. The system includes a signal-processing block (53), an I/Q phase imbalance detection and correction circuit (98), an I/Q gain imbalance detection and correction circuit (96), and an adaptive loop bandwidth control circuit (102). The I/Q phase imbalance detection and correction circuit (98) equalizes for the relative phase imbalance and the I/Q gain imbalance detection and correction circuit (96) equalizes for the relative gain imbalance between the I and Q channels created by the analog portion of a quadrature receiver. The adaptive loop bandwidth control circuit (102) dynamically adjusts at least one loop bandwidth for the I/Q gain imbalance detection and correction circuit (96) and the I/Q phase imbalance detection and correction circuit (98) on a slot boundary.
91 Citations
15 Claims
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1. A receiver for receiving a radio frequency signal, the receiver having a self-calibrating receive path correction system for correction of an I/Q gain imbalance and an I/Q phase imbalance in the radio frequency signal, the receiver comprising:
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a signal-processing block for processing the received radio frequency signal, thereby producing an unequalized I-signal and an unequalized Q-signal, wherein the signal processing block includes digital offset correction during the processing of the received radio frequency signal; an I/Q phase imbalance detection and correction circuit coupled to the signal-processing block for equalizing a phase of the unequalized I-signal and a phase of the unequalized Q-signal, thereby producing a phase equalized I-signal and a phase equalized Q-signal; an I/Q gain imbalance detection and correction circuit coupled to the I/Q phase imbalance detection and correction circuit for equalizing a gain of the phase equalized I-signal and a gain of the phase equalized Q-signal, thereby producing an I-image signal and a Q-image signal; an adaptive loop bandwidth control circuit coupled to the I/Q phase imbalance detection and correction circuit and to the I/Q gain imbalance detection and correction circuit for dynamically adjusting at least one loop bandwidth for the I/Q gain imbalance detection and correction circuit and the I/Q phase imbalance detection and correction circuit on at least one slot boundary; and wherein an at least one PN training signal is used for a self-calibration of the I/Q phase imbalance detection and correction circuit and the I/Q gain imbalance detection and correction circuit during a warm-up sequence to compensate for imbalances due to the signal-processing block. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A receiver for receiving a radio frequency signal, the receiver having a self-calibrating receive path correction system for correction of an I/Q gain imbalance and an I/Q phase imbalance in the radio frequency signal, the receiver comprising:
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a signal-processing block for processing the received radio frequency signal, thereby producing an unequalized I-signal and unequalized Q-signal; an I/Q phase imbalance detection and correction circuit coupled to the signal-processing block for equalizing a phase of the unequalized I-signal and a phase of the unequalized Q-signal, thereby producing a phase equalized I-signal and a phase equalized Q-signal wherein the I/Q phase imbalance detection and correction circuit comprises; an I/Q phase imbalance correction loop; and a feed forward signal path coupled to the I/Q phase imbalance correction loop, wherein the I/Q phase imbalance correction loop acquires an I/Q phase imbalance over a slot period, and further wherein the I/Q phase imbalance acquired is applied at the end of the slot period; an I/Q gain imbalance detection and correction circuit coupled to the I/Q phase imbalance detection and correction circuit for equalizing a gain of the phase equalized I-signal and a gain of the phase equalized Q-signal, thereby producing an I-image signal and a Q-image signal; and an adaptive loop bandwidth control circuit coupled to the I/Q phase imbalance detection and correction circuit and to the I/Q gain imbalance detection and correction circuit for dynamically adjusting at least one loop bandwidth for the I/Q gain imbalance detection and correction circuit and the I/Q phase imbalance detection and correction circuit on at least one slot boundary. - View Dependent Claims (8)
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9. A receiver for a radio frequency signal, the receiver having a self-calibrating receive that correction system for correction of an I/Q gain imbalance and an I/Q phase imbalance in the radio frequency signal, the receiver comprising:
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a signal-processing block for processing the received radio frequency signal, thereby producing an unequalized I-signal and an unequalized Q-signal; an I/Q phase imbalance detection and correction circuit coupled to the signal-processing block for equalizing a phase of the unequalized I-signal and a phase of the unequalized Q-signal, thereby producing a phase equalized I-signal and a phase equalized Q-signal; an I/Q gain imbalance detection and correction circuit coupled to the I/Q phase imbalance detection and correction circuit for equalizing a gain of the equalized I-signal and a gain of the phase equalized Q-signal, thereby producing an I-image signal and a Q-image signal wherein the I/Q gain imbalance detection and correction circuit comprises; an I/Q gain correction feedback loop; and a phase equalized feed forward signal path coupled to the I/Q gain correction feedback loop, wherein the I/Q gain correction feedback loop acquires an I/Q gain correction over a slot period, and further wherein the acquired I/Q gain correction is applied to the phase equalized feed forward signal path at the end of the slot period; and an adaptive loop bandwidth control circuit coupled to the I/Q phase imbalance detection and correction circuit and to the I/Q gain imbalance detection and correction circuit for dynamically adjusting at least one loop bandwidth for the I/Q gain imbalance detection and correction circuit and the I/Q phase imbalance detection and correction circuit on at least one slot boundary. - View Dependent Claims (10, 11, 12)
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13. A method for correction of an I/Q gain imbalance and an I/Q phase imbalance in a received radio frequency signal using a self-calibrating receive path correction system, the method comprising:
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performing a warm-up sequence of the receiver, the warm up sequence including the steps of performing a digital offset correction of an I-signal component and a Q-signal component of the received radio frequency signal in a high loop bandwidth mode, thereby producing an unequalized I-signal and an unequalized Q-signal, equalizing an I/Q gain of the unequalized I-signal and the unequalized Q-signal using a self calibrating PN training signal, and equalizing an I/Q phase of the unequalized I-signal and the unequalized Q-signal using a self calibrating PN training signal; and adaptively controlling at least one loop band width of the I/Q phase imbalance detection and correction circuit and the I/Q gain imbalance detection and correction circuit on a slot-by-slot basis based upon the received signal strength. - View Dependent Claims (14, 15)
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Specification