Mismatch cancellation in quadrature bandpass /spl Delta//spl Sigma/ modulators using an error shaping technique
作者： J. Riches , N. Erdol
DOI: 10.1109/TCSII.2002.1002510
关键词: Electronic engineering 、 Sigma 、 Band-pass filter 、 Mathematics 、 Switched capacitor 、 Spectral leakage 、 Signal transfer function 、 Pole–zero plot 、 Noise (electronics) 、 Passband
摘要: A technique for shaping component mismatch error in the real and imaginary paths of a complex (quadrature) /spl Delta//spl Sigma/ are studied simulated. Complex bandpass modulators provide improved performance over pair same order conversion narrow-band quadrature intermediate frequency (IF) signals. This is possible due to elimination redundant conjugate pairs poles zeros its noise signal transfer function. Mismatches paths, however, results spectral leakage image band interference quantization passband converted output. Strategic pole-zero placement, as well adaptive techniques has been earlier works. The work presented here takes advantage inherent dual modulator reduce effects using switched capacitor technique.
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