A wireless system for continuous in-mouth pH monitoring

Ma, Daryl; Mason, C.H.; Ghoreishizadeh, Sara S.

doi:10.1109/biocas.2017.8325556

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…The simulated input-output characteristics of the potentiometric circuit is shown in Fig. 6, showing sufficiently linear behavior between 0.4V to 1V, which is adequate for values measured using a metal oxide based pH electrode [15]. The curve displays a linear relation, with a slope of -11.4Hz/V input.…”

Section: Amplifiermentioning

confidence: 74%

DAPPER: A Low Power, Dual Amperometric and Potentiometric Single-Channel Front End

Ghoreishizadeh

Georgiou

2020

2020 IEEE International Symposium on Circuits and Systems (ISCAS)

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DAPPER is a front end system capable of simultaneous amperometric and potentiometric sensing proposed for lowpower multi-parameter analysis of bio-fluids such as saliva. The system consists of two oscillator circuits, generating a frequency relative to their sensed current and voltage signals. These signals are then mixed together to produce a single channel output that can be transmitted through backscattering (load-shift keying). The entire system consumes 40µW from a 1.4V supply. The linear ranges of potentiometry and amperometry circuits are 0.4V -1V and 250pA -5.6µA (87dB), and their input referred noise is 1.7µV and 44.6fA, respectively.

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Section: Amplifiermentioning

confidence: 74%

DAPPER: A Low Power, Dual Amperometric and Potentiometric Single-Channel Front End

Ghoreishizadeh

Georgiou

2020

2020 IEEE International Symposium on Circuits and Systems (ISCAS)

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“…The circuit draws a maximum power of 10.4µW@400kHz. The potentiometric circuit has an input of 0.3-1V based on the possible voltages measured with an IrOx electrode [16]. The linear range of the circuit ranges from 9.27Hz@0.3V to 1.51Hz@1V.…”

Section: Simulation Resultsmentioning

confidence: 99%

SPACEMan: Wireless SoC for Concurrent Potentiometry and Amperometry

Chen

Ghoreishizadeh

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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This work describes the implementation of SPACE-Man, a wireless electrochemical system with concurrent potentiometric and amperometric sensing that can be utilised for saliva, sweat or point of care diagnostics. This system is designed with the vision of simpler interfaces for biofluid analysis. With a complete system-on-chip including electrochemical sensing, power management and data transmission, conventional interfaces like wirebonds will no longer be required in post-processing steps. The proposed architecture consists of a sensor front-end with four electrodes for concurrent amperometric and potentiometric sensing. This front-end outputs square wave signals mixed together with varying frequencies dependent on the sensed input, with the output type switchable with a state machine. A power management system consisting of a low dropout regulator (LDO) band gap reference (BGR), and a rectifier bridge is utilised for supplying power from an inductive link at 433MHz. Sensor data is transmitted wirelessly to a base station using LSK (Load-Shift Keying). The sensor front-end consumes 18µW, which the power management system more than adequately provides. The core area of the electronics without the coil is a conservative size of 0.41mm 2 .

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