公开(公告)号：US20180321349A1

公开(公告)日：2018-11-08

申请号：US15586877

申请日：2017-05-04

Applicant: Analog Devices Global

Inventor： GuangYang Qu ,  Leicheng Chen ,  Michael Looney

IPC: G01R35/00 ,  G01R17/02

CPC classification number: G01R35/005 ,  G01R27/14

Abstract: The sensor interface IC measures or calibrates a target resistance to be used as a gain resistor for a TIA amplifier in the sensor interface IC. One or more excitation currents are generated in response to different specified excitation voltages that are applied to an external calibration resistor having a specified calibration resistance value. Response voltages are measured across the target resistor, respectively in response to the corresponding different one or more excitation currents. The resistance value of the target resistor is determined using a difference between the measured response voltages, a difference between the specified excitation voltages, and the specified calibration resistance value.

公开(公告)号：US10429483B2

公开(公告)日：2019-10-01

申请号：US15586877

申请日：2017-05-04

Applicant: Analog Devices Global

Inventor： GuangYang Qu ,  Leicheng Chen ,  Michael Looney

IPC: G01R35/00 ,  G01R27/14

Abstract: The sensor interface IC measures or calibrates a target resistance to be used as a gain resistor for a TIA amplifier in the sensor interface IC. One or more excitation currents are generated in response to different specified excitation voltages that are applied to an external calibration resistor having a specified calibration resistance value. Response voltages are measured across the target resistor, respectively in response to the corresponding different one or more excitation currents. The resistance value of the target resistor is determined using a difference between the measured response voltages, a difference between the specified excitation voltages, and the specified calibration resistance value.

公开(公告)号：US10782263B2

公开(公告)日：2020-09-22

申请号：US15586849

申请日：2017-05-04

Applicant: Analog Devices Global

Inventor： Michael Looney ,  GuangYang Qu

IPC: G01N27/416 ,  G01N27/12 ,  G01N27/404

Abstract: An impedance in an electrochemical gas sensor can be measured by connecting at least one pin in an integrated circuit to at least one electrode in an electrochemical gas sensor, using a damping capacitor to connect the at least one pin in the integrated circuit to an electrical ground, applying a voltage to the electrochemical gas sensor to provide a bias voltage to at least one electrode in the electrochemical gas sensor, receiving a current from at least one electrode in the electrochemical gas sensor, determining a measured gas amount from the received current, activating a switch located within the integrated circuit to isolate the damping capacitor from the at least one pin in the integrated circuit, and measuring an impedance of the electrochemical gas sensor using an excitation signal while the at least one damping capacitor is isolated from the at least one electrode in the electrochemical gas sensor.