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A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer. | LitMetric

A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer.

Micromachines (Basel)

Auckland Bioengineering Institute, The University of Auckland, Auckland 1010, New Zealand.

Published: September 2020

AI Article Synopsis

Article Abstract

This paper presents a capacitive pressure sensor interface circuit design in 180 nm XH018 CMOS technology for an implantable capacitive pressure sensor, which has a wireless power supply and wireless data transfer function. It integrates full-bridge rectifiers, shorting control switches, low-dropout regulators, bandgap references, analog front end, single slope analog to digital converter (ADC), I2C, and an RC oscillator. The low-dropout regulators regulate the wireless power supply coming from the rectifier and provide a stable and accurate 1.8 V DC voltage to other blocks. The capacitance of the pressure sensor is sampled to a discrete voltage by the analog front end. The single slope ADC converts the discrete voltage into 11 bits of digital data, which is then converted into 1 kbps serial data out by the I2C block. The "1" of serial data is modulated to a 500 kHz digital signal that is used to control the shorting switch for wireless data transfer via inductive back scatter. This capacitive pressure sensor interface IC has a resolution of 0.98 mmHg (1.4 fF), average total power consumption of 7.8 mW, and ±3.2% accuracy at the worst case under a -20 to 80 °C temperature range, which improves to ±0.86% when operated between 20 and 60 °C.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7601096PMC
http://dx.doi.org/10.3390/mi11100897DOI Listing

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