Extended frequency-band-decomposition sigma---delta A/D converter
Analog Integrated Circuits and Signal Processing
Analytical settling noise models of single-loop sigma-delta ADCs
IEEE Transactions on Circuits and Systems II: Express Briefs
The software radio architecture
IEEE Communications Magazine
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Time interleaved sigma-delta converter is a potential candidate for multi-mode wideband analog to digital (A/D) converters dedicated for multistandard receivers. However, the interpolation by zeros to compress the useful signal bandwidth at the input of the sigma-delta modulator imposes constraints on the implementation of the analog part leading to a very large die area due to the high value required for the sampling capacitor. This paper proposes a new interpolation technique using extra samples instead of zeros resulting from the oversampling of the input signal. This new technique not only reduces the die area and the order of the anti-alias filter but also improves A/D converter performance. The proposed technique was simulated and implemented in a four channel time interleaved sigma-delta designed in a 1.2 V 65 nm CMOS process.