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A 10-bit Ultra-Low-Power SAR ADC with a Novel DAC Switching Method

Weibo Hu *, Donald Lie**

* Research Scholar, ECE Department of Texas Tech. University, Lubbock.

** Associate Professor, ECE Department of Texas Tech. University, Lubbock.

Periodicity:January - March'2011
DOI : https://doi.org/10.26634/jee.4.3.1395

Abstract

A 10-bit single-ended ultra-low-power Successive Approximation Register ADC with a novel DAC switching technique is designed in the TSMC 0.18µm mixed-signal CMOS technology. This method uses a reference voltage of VR/2, rather than VR, as the only reference voltage to digitize the input signals with the amplitude range of [0, VR]. Compared with the conventional switching method, this work reduces the size of binary-weighted capacitor array by 50%, lowering the average power consumption in the DAC during digitizing by 87.5%, and it also reduces the power consumption during sampling by 63.5%. With the sampling frequency of 77 kHz, ADC’s post-layout simulation resolution is 8.84 bits and ERBW (Effective Resolution Bandwidth) is 60 kHz, and the post-layout simulation FOM of our 10-bit SAR ADC can reach 18.9 fJ/(conversion-step), which is among the best ADCs FOM reported in a CMOS 0.18 µm technology.

Keywords

SAR ADC, DAC, Capacitor Switching Method

How to Cite this Article?

Weibo Hu and Donald Y.C. Lie (2011). A 10-Bit Ultra-Low-Power SAR ADC with a Novel DAC Switching Method. i-manager’s Journal on Electrical Engineering, 4(3), 17-22. https://doi.org/10.26634/jee.4.3.1395

References

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[3]. E. Culurciello., and A. G. Andreou, (2006). “An 8-bit 800?W 1.23-MS/s Successive Approximation ADC in SOI CMOS,” IEEE Tran. Circuit and Systems-II, Sep. Vol. 53, No. 9, pp. 858-891.

[4]. B. P. Ginsburg., and A. P. Chandrakasan, (2005). “An Energy-Efficient Charge Recycling Approach for a SAR Converter With Capacitor DAC,” May, Proc. IEEE ISCAS, pp. 184–187, Kobe, Japan.

[5]. C.C. Liu, S.J. Chang, G.Y. Huang., and Y.Z. Lin, (2010). “A 10-bit 50Ms/s SAR ADC with a Monotonic Capacitor Switching Procedure,” Apr. IEEE J. Solid-State Circuits, Vol. 45, No. 4, pp. 731-740.

[6]. V. Hariprasath, J. Guerber, S.-H. Lee., and U. -K. Moon, (2010). “Merged capacitor switching based SAR ADC with highest switching energy-efficiency,”Apr. Electronics Letters, Vol. 46, No. 9, pp. 620-621.

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A 10-bit Ultra-Low-Power SAR ADC with a Novel DAC Switching Method

Abstract

Keywords

How to Cite this Article?

References

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