Wideband digital correction of I and Q mismatch in quadrature radio receivers

Kong-Pang Pun, J.E. Franca, C. Azeredo-Leme
2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353)  
I/Q mismatches are common in radio receivers, which apply quadrature demodulation schemes. Numerous methods have been developed to estimate and correct these errors for narro w-band signals. In this paper a wideband correction method is introduced. First the frequency-dependent I/Q mismatches a.re estimated by local test signal injection. Then a digital filter is constructed to correct them. With this method, a significant amount of image rejection over a broad bandwidth can be achiev ed as
more » ... be achiev ed as demonstrated ly high-level simulations.
doi:10.1109/iscas.2000.857556 dblp:conf/iscas/PunFL00 fatcat:dv5tabpnonfojirokvxrart4se