Impedance characteristic circuit for electrochemical sensor

US10288674B2 · kind B2 · utility

Assignee

• Analog Devices Global Unlimited Company · BM

Inventors

• GuangYang Qu · Beijing, CN
• Junbiao Ding · Beijing, CN
• Tony Yincai Liu · Beijing, CN
• Shurong Gu · Beijing, CN
• Yimiao Zhao · Beijing, CN
• Hanqing Wang · Beijing, CN
• Leicheng Chen · Rongjiang, CN

Key dates

• Filing date: May 4, 2017
• Grant date: May 14, 2019
• Expiry date: Oct 28, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R27/02
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A electrochemical or other sensor interface circuit architecture can deliver substantial DC offset bias to an electrochemical or other sensor separately or independently from delivering a time-varying AC excitation signal, which can then be provided with higher resolution, which, in turn, can allow better resolution of the measured response signal providing the impedance characteristic of sensor condition. For example, a differential time-varying AC excitation signal for the sensor condition characteristic can be delivered separately and independently from a differential stable (e.g., DC or other) bias signal, such as by using separate digital-to-analog converters (DACs), so that providing the more stable signal does not limit the resolution and accuracy of the time-varying signal, such as by using up the dynamic range of a single DAC.