基于时间累加器的二阶△∑时间数字转换器

提出以一个可获得高的分辨率和宽的信号带宽的二阶△∑时间数字转换器(TDC),TDC基于门控环形振荡器型TDC并结合时间差加法器构成的时间累加器实现了二阶量化噪声整形。采用SMIC28nm工艺设计,Spectre仿真结果表明,在1M带宽内噪声底约为-82dBps^2/Hz,等效到50Ms/s奈奎斯特率型TDC的分辨率约为2ps,功耗取决于输入时间间隔,在测量间隔1ns时功耗约为1.19mW。受到结构限制,这种类型时间数字转换器输入范围较小。...

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Bibliographic Details
Published in电子技术应用 Vol. 43; no. 10; pp. 47 - 51
Main Author 赵磊 张锋
Format Journal Article
LanguageChinese
Published 中国科学院大学,北京100049%中国科学院 微电子研究所,北京,100029 2017
中国科学院 微电子研究所,北京100029
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ISSN0258-7998
DOI10.16157/j.issn.0258-7998.172185

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Summary:提出以一个可获得高的分辨率和宽的信号带宽的二阶△∑时间数字转换器(TDC),TDC基于门控环形振荡器型TDC并结合时间差加法器构成的时间累加器实现了二阶量化噪声整形。采用SMIC28nm工艺设计,Spectre仿真结果表明,在1M带宽内噪声底约为-82dBps^2/Hz,等效到50Ms/s奈奎斯特率型TDC的分辨率约为2ps,功耗取决于输入时间间隔,在测量间隔1ns时功耗约为1.19mW。受到结构限制,这种类型时间数字转换器输入范围较小。
Bibliography:A second order △∑ Time-to-Digital Converter(TDC) is proposed to achieve high resolution and wide signal bandwidth. The proposed TDC based on gated-ring oscillator(GRO)-based TDC achieves second order quantization noise shaping with a time accumulator using time difference adders. Implemented in SMIC 28 nm CMOS process. Spectre simulation results show the noise floor of the TDC within 1 M bandwidth is about -82 dBps2/Hz which corresponds to a 50 Ms/s Nyquist-rate TDC and with 2 ps steps. The TDC power consumption depends on the time difference between input edges, typically about 1.19 mW for 1 ns interval measurement. Limited by the structure, the input range of this type of TDC is small.
Zhao Lei1,2,Zhang Feng1(1.Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China; 2.University of Chinese Academy, Beijing 100049, China)
time-to-digital converter(TDC) ; time accumulator ; noise shaping ; time-domain
11-2305/TN
ISSN:0258-7998
DOI:10.16157/j.issn.0258-7998.172185