A 749nW 1MSps 8-bit SAR ADC at 0.5V employing boosted switches

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Conference Proceeding

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Portability is an increasingly demanded feature in modern electronic system and circuit design, pushing ever tighter on power budget. Besides the well-known limitations on the power constraints, alternative power sources such as solar, vibrational and RF suggest the employment of also lower operating voltages, to match the sub-Volt levels generated by these sources. In this paper, we propose an 8-bit 1MSps SAR ADC in 90nm working with a 0.5V power supply, whose operation relies on an improved boosted switch. The ADC simulation results, including transient noise, exhibit a 7.67 effective number of bits (ENOB) for a full-scale input sinusoid near Nyquist frequency, while consuming 749nW. This leads to a figure-of-merit of 3.68fJ/conv.step. © 2012 IEEE.

Publication Title

2012 19th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2012