Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-09-11
2011-11-22
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
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.
Ahn Sung
Liu Shuwang
Marvell International Ltd.
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