Abstract
This paper presents a reference-voltage regulator free successive-approximation-register analog-to-digital converters (SAR ADC) with self-timed pre-charging for wireless-powered implantable medical devices. Assisted by a self-timed pre-charging technique, the proposed SAR ADC eliminates the need for a power-hungry reference-voltage regulator and area-consuming decoupling capacitor while maintaining insensitivity to the supply voltage fluctuation. Fabricated with a 0.18-µm complementary metal–oxide–semiconductor (CMOS) technology, the proposed SAR ADC achieves a Signal To Noise And Distortion Ratio (SNDR) of 53.32 dB operating at 0.8 V with a supply voltage fluctuation of 50 mVpp and consumes a total power of 2.72 µW at a sampling rate of 300 kS/s. Including the self-timed pre-charging circuits, the total figure-of-merit (FOM) is 23.9 fJ/conversion-step and the total area occupied is 0.105 mm2.
Highlights
For conventional successive-approximation-register analog-to-digital converters (SAR ADC) adopted in such systems [2,3,4,5,6,7,8,9], a dedicated regulator is needed to stabilize the reference voltage against the ADC core
Decoupling capacitors of a few hundred pF or larger values are needed to maintain the stable operation of the regulator [10]
With a supply voltage fluctuation of 50 mVpp, the proposed design has a similar Signal To Noise And Distortion Ratio (SNDR) to other designs
Summary
ADC core [5,6,7,8], while only amedical few studies aimed to optimize the reference-voltage regulator wireless-powered implantable devices. In wireless-powered implantable pre-charging for wireless-powered implantable medical devices It eliminates the power-hungry medical devices, the output voltage of the rectifier contains large ripples and cannot be used directly as reference-voltage regulator to reduce the overall power consumption of the SAR ADC. In the typical wireless-powered implantable the need for a large on-chip decoupling capacitor is eliminated, which helps to reduce the silicon medical devices, a dedicated regulator with decoupling capacitor is used to provide a stable reference area.voltage. Achieves better FOM with a small area compared to several existing SAR ADC designs
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