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An Ultra-Low Power Successive-Approximation-Register Analog-to-Digital Converter with Input-Referred Amplifier-Skipping Window Technique in 55 nm Low-Leakage Process

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This paper presents an ultra-low power successive-approximation-register (SAR) analog-to-digital converter (ADC) for biomedical applications. To reduce power consumption, an input-referred amplifier-skipping window (IRAS Window) technique is employed. The preamplifier in front of the comparator is disabled for power saving when the input signal is out of the predefined window size. Stack forcing and multi-V t design approaches are used to reduce the leakage current. With the 55 nm low-leakage process and a 0.6 V power supply, the ADC achieves a SNDR of 73.2 dB (11.86 bits ENOB) and a SFDR of 83.9 dB at 10 kS/s sampling rate. Total power consumption is 284 nW, yielding a figure of merit of 7.6 fJ/conversion-step.
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Document Type: Short Communication

Publication date: September 1, 2014

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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