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A programmable low-power ADC interface for an ISFET sweat sensor used in a wearable multi-sensing system

Maher Kayal, Evgenia Voulgari, François Krummenacher
2019
Conference paper
Abstract

An application specific integrated circuit (ASIC) named ANTIGONE (ANalog To dIGital cONvErter) was designed in AMS 0.35 mu m technology to interface with four Ion-sensitive field-effect transistor (ISFET) sensors and perform real-time monitoring of some biomarkers in human sweat. The non-invasive sweat sensing system is targeted for wearable personalized medicine and healthcare applications. The ASIC is based on the current-to-frequency converter (CFC) architecture and is able to perform measurements of multiple currents from a few pA up to 500 nA in time multiplexing. The ASIC is designed for low power consumption and interfaces with the sensors, biases them to the required voltages and sends the measured current values through a Serial Peripheral Interface (SPI) to a portable device.

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Computer engineering
Physics
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An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of miniaturized transistors and other electronic components are integrated together on the chip. This results in circuits that are orders of magnitude smaller, faster, and less expensive than those constructed of discrete components, allowing a large transistor count.
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An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is defined as the net rate of flow of electric charge through a surface. The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes.
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