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A system-on-chip digital pH meter for use in a wireless diagnostic capsule

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3 Author(s)
Hammond, P.A. ; Dept. of Electron. & Electr. Eng., Glasgow Univ., UK ; Ali, D. ; Cumming, D.R.S.

This paper describes the design and implementation of a system-on-chip digital pH meter, for use in a wireless capsule application. The system is organized around an 8-bit microcontroller, designed to be functionally identical to the Motorola 6805. The analog subsystem contains a floating-electrode ISFET, which is fully compatible with a commercial CMOS process. On-chip programmable voltage references and multiplexors permit flexibility with the minimum of external connections. The chip is designed in a modular fashion to facilitate verification and component re-use. The single-chip pH meter can be directly connected to a personal computer, and gives a response of 37 bits/pH, within an operating range of 7 pH units.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:52 ,  Issue: 4 )

Date of Publication:

April 2005

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