A/D conversion using an asynchronous delta-sigma modulator and a Time-to-Digital converter

被引：22
|
作者：
Daniels, Jorg [1 ]
Dehaene, Wim [1 ]
Steyaert, Michiel [1 ]
Wiesbauer, Andreas [2 ]
机构：
[1] Katholieke Univ Leuven, ESAT MICAS, Kasteelpk Arenberg 10, B-3001 Heverlee, Belgium
[2] Infineon Technol Austria AG Villach, Villach, Austria
来源：
PROCEEDINGS OF 2008 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-10 | 2008年
关键词：
D O I：
10.1109/ISCAS.2008.4541751
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
An analog to digital conversion scheme based on an Asynchronous Delta Sigma Modulator is presented. It uses a Tlme-to-Digital converter to convert the continuous-time square wave signal produced by the Asynchronous Delta Sigma Modulator to a time-quantized digital signal. The original input signal is then recovered by applying a digital demodulation algorithm derived from general duty-cycle modulation theory. This technique shifts the complexity towards the digital domain and is therefore especially suited for ultra-low voltage technologies beyond 90 am. Simulations show 13 bit accuracy for Btuetooth baseband 500 kHz with a first-order Delta Sigma modulator and a Time-to-Digital Converter with 10 ps resolution running at 12 MHz. Using a second-order feedback system to shape the quantization noise of the Time-to-Digital converter, the bandwidth can be increased to 12 MHz with 12 bit accuracy, suitable for video applications.
引用
收藏
页码：1648 / +
页数：2
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