一種低功耗多通道連續漸進式類比數位轉換器的設計方法

A Systematic Design Methodology of Low-Power Time-Interleaved SAR ADC

廖冠榮(Kuan-Jung Liao)

指導教授 ： 李泰成

國立臺灣大學/電機資訊學院/電子工程學研究所/碩士(2018年)

https://doi.org/10.6342/NTU201803064

摘要

連續漸進式暫存類比數位轉換器(SAR ADC)因為其良好的功耗效率而被廣泛應用於可攜式生醫電路系統。然而，SAR ADC的設計最佳化對許多電路工程師而言往往是非常耗費時間的。本論文提出一種基於電路行為模型的低功耗多通道交錯時序SAR ADC的系統化電路設計方法，目標是能夠輔助工程師評估一套SAR ADC電路規格的可行性。電路行為模型基於程式語言MATLAB，由不匹配模型、延遲模型、雜訊模型組成，行為模型透過Cadence Spectre的電晶體層級模擬來驗證，本文也提供基於一百八十奈米CMOS製程的設計範例以展示此設計方法的準確性。

關鍵字

連續漸進式暫存 ； 低功耗 ； 行為模型

並列摘要

Successive approximation register analog-to-digital converters (SAR ADCs) are widely used in portable biomedical electronic systems due to their excellent power efficiency. However, the design optimization of SAR ADCs is often very time-consuming for many circuit engineers. This paper proposes a systematic design methodology for low-power time-interleaved SAR ADCs based on circuit behavioral model, aiming to assist engineers to evaluate the feasibility of a given specification of SAR ADC. The circuit behavioral model is based on MATLAB and consisted of mismatch model, delay model and noise model. The behavioral model is verified through transistor-level simulation with Cadence Spectre. Design examples based on 0.18um CMOS technology are also provided to demonstrate the accuracy of this design methodology.

並列關鍵字

Successive-approximation register ； low power ； behavioral model

參考文獻

[1] A. P. Chandrakasan and R. W. Brodersen, “Minimizing power consumption in digital CMOS circuits,” Proc. IEEE, vol. 83, pp. 498–523, Apr. 1995.

[2] B. Razavi, Principles of Data Conversion System Design, Wiley-IEEE Press, New York, 1995.

[3] D. Johns and K. Martin, Analog Integrated Circuit Design, John Wiley & Sons, New York, 1997.

[4] M. Gustavsson, J. J. Wikner, and N. Tan, CMOS Data Converters for Communi -cations, Kluwer Academic Publisher, Boston, 2000.

[5] L. Kull et al., “A 32 mW 8 b 8.8 GS/s SAR ADC with low-power capacitive reference buffers in 32 nm digital SOI CMOS,” Symp. VLSI Circuits Dig. Tech. Papers, pp. 260–261, Jun. 2013.