Low Noise High Linearity Current Readout Topologies for Potentiostat Circuitry

Toprak, S.; Vural, Revna Acar; Batur, Okan Zafer

doi:10.1109/miel52794.2021.9569170

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…Depending on the direction of the current, either a PMOS or NMOS current mirror is enabled to copy the current to the output branch. Different from other conventional CC architectures [32] [33], this circuit ensures constant drain-source voltages of the mirroring transistors to improve current mirroring accuracy and to avoid the channel modulation effect. Regulating circuits, consisting of transistors M 3 and M 4 , are built to fix the drain voltage of M 5 and M 6 to VP cas and VN cas , respectively.…”

Section: A the Potentiostat And Current Conveyormentioning

confidence: 99%

A Multichannel Electrochemical Sensor Interface IC for Bioreactor Monitoring

Lin,

Sijbers,

Avdikou

et al. 2023

IEEE Trans. Biomed. Circuits Syst.

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This research paper introduces a novel integrated circuit (IC) designed for bioreactor applications catering to multichannel electrochemical sensing. The proposed IC comprises 2x potentiometric, 2x potentiostat, 2x ISFET channels and 1x temperature channel. The potentiostat channel utilizes a current conveyor-based architecture with a programmable mirroring ratio, enabling an extensive measurement range of 114 dB. The potentiometric channel incorporates a customized electrostatic discharge (ESD) protection circuit to achieve ultra-low input leakage in the picoampere range, while the ISFET channel employs a constant-voltage, constant-current topology for accurate pH measurement. Combined with the die temperature sensor, this IC is well-suited for monitoring bioreactions in realtime. Additionally, all channels can be time-multiplexed to a reconfigurable analog backend, facilitating the conversion of input signals into digital codes. The prototype of the IC is fabricated using 0.18 µm standard CMOS technology, and each channel is experimentally characterized. The interface IC demonstrates a peak power consumption of 22µW.

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Section: A the Potentiostat And Current Conveyormentioning

confidence: 99%

A Multichannel Electrochemical Sensor Interface IC for Bioreactor Monitoring

Lin,

Sijbers,

Avdikou

et al. 2023

IEEE Trans. Biomed. Circuits Syst.

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Low-Noise Potentiostat Readout Circuit with a Chopper Fully Differential Difference Amplifier for Glucose Monitoring

Choi¹,

Nam²,

Yoo³

et al. 2022

Applied Sciences

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This paper presents a low-noise potentiostat readout circuit with a chopper fully differential difference amplifier (FDDA) for glucose monitoring. Glucose monitoring is necessary for the early diagnosis of diabetes complications and for health management. Ammeter electrochemical sensors are widely used for glucose detection, and in general, a three-electrode structure of a reference electrode (RE), a counter electrode (CE), and a working electrode (WE) is implemented with a potentiostat structure. A low-noise characteristic of the readout circuit is essential for highly accurate glucose monitoring. The chopping technique can reduce low-frequency noises such as 1/f noise and can achieve the required low-noise characteristic. The proposed potentiostat readout circuit is based on a low-noise chopper FDDA with a class-AB output stage. The implementation of the chopper FDDA scheme of the potentiostat readout circuit can decrease the number of amplifiers in the control part of the potentiostat, with reduced power consumption and a wide dynamic output range. The negative feedback loop of the inverting amplifier scheme with the FDDA maintains the voltage between the WE and RE constants. The negative feedback loop tracks the reference voltage of the RE with an input voltage of the WE. The proposed potentiostat readout circuit is designed in the standard 0.18 µm CMOS process, and the simulated current consumption is 48.54 μA with a 1.8 V power supply. The simulated input-referred noise level was 8.53 pArms.

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Low Noise High Linearity Current Readout Topologies for Potentiostat Circuitry

Cited by 2 publications

References 8 publications

A Multichannel Electrochemical Sensor Interface IC for Bioreactor Monitoring

A Multichannel Electrochemical Sensor Interface IC for Bioreactor Monitoring

Low-Noise Potentiostat Readout Circuit with a Chopper Fully Differential Difference Amplifier for Glucose Monitoring

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