Applications of polyphase filters for bandpass sigma-delta ADC

angelweishan · 发表于 2010-8-4 09:27:22

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Applications of polyphase filters for bandpass sigma-delta analog-to-digital conversion.

Abstract
The traditional lowpass Sigma-Delta based Analog-to-Digital (A/D) conversion
principle has been recently extended to bandpass for direct IF conversion. Such converter offers high Signal-to-Noise (SNR) ratios for narrowband signals relative to the sampling frequency, at significantly lower oversampling ratios in comparison to the conventional lowpass SD converters. In this paper a sixth-order modulator sampled at 1.82MHz coupled with a multistage polyphase decimation filter is reported for the conversion of bandpass signals centred at 455kHz with 14kHz bandwidth. The decimation filter is using a small number of short-wordlength filter coefficients. The simulations undertaken demonstrated that this setup realises 124.3dB SNR with less than 4mdB passband ripples for a half/full-scale composite 20-sinewave input signal potential of up to 20-bit performance. The resultant converter can directly accomplish demodulation of narrow-band AM signals

angelweishan · 发表于 2010-8-4 11:06:39

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xuyimorgan · 发表于 2011-1-19 16:13:23

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geneicz · 发表于 2011-2-10 14:29:10

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梧桐 · 发表于 2011-4-17 21:50:13

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xgfang · 发表于 2011-7-25 16:40:55

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xgfang · 发表于 2011-7-25 16:45:16

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newbyron · 发表于 2012-1-7 15:53:37

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xiaomanzi · 发表于 2013-11-18 20:32:57

jeffej · 发表于 2015-3-7 15:58:25

Applications of polyphase filters for bandpass sigma-delta ADC

[资料] Applications of polyphase filters for bandpass sigma-delta ADC

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