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

页码：1648 / +

页数：2