Image rejection mixer with mismatch compensation

Details Image rejection mixer with mismatch compensation Image rejection mixer with mismatch compensation

2006-04-18

2006-04-18

Tsang, Fan (Department: 2645)

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

C455S326000, C327S116000

Reexamination Certificate

active

07031686

ABSTRACT:
An image rejection mixer (IRM) for rejecting signals having image frequency and, more particularly, a mixer for rejecting signals of image frequency by using mismatch compensation is provided. The image rejection mixer comprises: first and second mixers; first and second converting means, each of which transforms each output of the first and second mixers to digital signal; third and fourth mixers, each of which mixes output of the first converting means with each of second local oscillation in-phase signal and quadrature-phase signal, respectively; fifth and sixth mixers, each of which mixes output of the second converting means with each of second local oscillation in-phase signal and quadrature-phase signal, respectively; means for subtracting; means for adding; and means for compensating gain-mismatch between the first and second mixers.

REFERENCES:
patent: 6330290 (2001-12-01), Glas
patent: 6731917 (2004-05-01), Krishna
Pun, K-P, et al., “A Digital Method for the Correction of I/Q Phase Errors in Complex Sub-Sampling Mixers”,IEEE D-7803-5975-5/00, pp. 171-174 (2000) 2000 Southwest Symposium. Feb. 27-29, 2000.
Glas, .P.F., “Digital I/Q Imbalance Compensation in a Low-IF Receiver”,IEEE O-7803-4984-9-98, pp. 1461-1466 (1998).
Rudell, JC, et al., “A 1.9-GHz Wide-Band IF Double Conversion CMOS Receiver for Cordles Telephone Applications”,IEEE J Solid State Circuits, 32(12), pp. 2071-2088, (1997).

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