A Continuous-Time Delta-Sigma Modulator for RF Subsampling Receivers

被引：2
|
作者：
Ucar, Alper [1 ]
Cetin, Ediz [1 ]
Kale, Izzet [1 ]
机构：
[1] Univ Westminster, Appl DSP & VLSI Res Grp, London W1W 6UW, England
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2012年 / 59卷 / 05期
基金：
英国工程与自然科学研究理事会;
关键词：
Analog-to-digital (A/D) conversion; bandpass sampling; delta-sigma modulation; subsampling;
D O I：
10.1109/TCSII.2012.2190860
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We propose a new continuous-time (CT) delta-sigma modulator (DSM) to be utilized in radio-frequency (RF) subsampling receivers for analog-to-digital conversion. Subsampling DSMs employ sub-Nyquist sampling with respect to the input signal frequency and oversampling with respect to the signal bandwidth. The proposed CT-DSM mitigates the effects of subsampling by modifying the feedback path of the modulator to accommodate the RF replica of the feedback signal and by enhancing the quality (Q) factor of the loop filter. The novel modulator has significant improvements over previously published subsampling modulators as it provides jitter and image suppression and excess loop delay compensation to improve the dynamic range, thus enabling the modulator to be utilized in subsampling receivers when a relatively low sampling rate is desired.
引用
收藏
页码：272 / 276
页数：5
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