Systems and methods for I/Q imbalance correction and...

Pulse or digital communications – Receivers – Angle modulation

Reexamination Certificate

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C375S235000, C375S320000, C375S322000, C327S254000, C329S306000

Reexamination Certificate

active

08064542

ABSTRACT:
Disclosed herein are systems and methods for accurate removal of I/Q mismatch in received signals of an analog FM receiver. The analog FM receiver includes a down-converter, a calibration circuit that estimates I/Q mismatch values, and a compensation circuit that uses the estimated mismatch values to reduce the effects of I/Q mismatch. In one aspect, the calibration circuit uses an adaptive dual-parameter compensation scheme to iteratively correct the received signals by approximating a coefficient value and an amplitude value that minimize the signals' amplitude variation from the amplitude value. In another aspect, phase and amplitude mismatch parameters can be determined using the coefficient value.

REFERENCES:
patent: 6985549 (2006-01-01), Biracree et al.
patent: 7693215 (2010-04-01), Chen
patent: 2003/0035498 (2003-02-01), Li et al.
Elahi, I., Muhammad, K., Balsara, P., “I/Q Mismatch Compensation Using Adaptive Decorrelation in a Low-IF Receiver in 90-nm CMOS Process”, Feb. 2006, IEEE Journal of Solid-State Circuits, vol. 41 No. 2, p. 395-404.
Imtinan Elahi, et al “I/Q Mismatch Compensation Using Adaptive Decorrelation in a Low-If Receiver in 90-nm CMOS Process”, IEEE Journal of Solid-State Circuits, vol. 41, No. 2, pp. 395-404, Feb. 2006.

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