公开(公告)号：US20180321302A1

公开(公告)日：2018-11-08

申请号：US15586869

申请日：2017-05-04

Applicant: Analog Devices Global

Inventor： GuangYang Qu ,  Junbiao Ding ,  Tony Yincai Liu ,  Shurong Gu ,  Yimiao Zhao ,  Hanqing Wang ,  Leicheng Chen

IPC: G01R31/28 ,  G01R15/16

CPC classification number: G01R31/2829 ,  G01N27/416 ,  G01N27/4163 ,  G01N27/4175 ,  G01R15/16 ,  G01R27/02

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.

公开(公告)号：US10288674B2

公开(公告)日：2019-05-14

申请号：US15586869

申请日：2017-05-04

Applicant: Analog Devices Global

Inventor： GuangYang Qu ,  Junbiao Ding ,  Tony Yincai Liu ,  Shurong Gu ,  Yimiao Zhao ,  Hanqing Wang ,  Leicheng Chen

IPC: G01R31/28 ,  G01R15/16 ,  G01R27/02 ,  G01N27/417 ,  G01N27/416

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.

公开(公告)号：US20180321187A1

公开(公告)日：2018-11-08

申请号：US15586942

申请日：2017-05-04

Applicant: Analog Devices Global

Inventor： Shurong Gu ,  Hanqing Wang ,  GuangYang Qu ,  Dennis A. Dempsey

IPC: G01N27/416 ,  G01N27/48

CPC classification number: G01N27/4163 ,  G01N27/416

Abstract: Techniques for generating a diagnostic waveform for a sensor are provided. In an example, a control circuit for an electrochemical sensor can include power supply inputs configured to receive a supply voltage, a first signal generator configured to receive control information and to generate a first signal on a first output using the supply voltage and the control information, a second signal generator configured to receive the control information and to provide a second signal on a second output, using the supply voltage and the control information. An output voltage between the first output and the second output, in a diagnostic mode of operation of the control circuit, can include a periodic signal having a peak-to-peak voltage greater than the supply voltage.

公开(公告)号：US09941894B1

公开(公告)日：2018-04-10

申请号：US15586848

申请日：2017-05-04

Applicant: Analog Devices Global

Inventor： Shurong Gu ,  Dennis A. Dempsey ,  GuangYang Qu ,  Hanqing Wang ,  Tony Yincai Liu

IPC: H03M1/66 ,  H03M1/08 ,  H03M1/00 ,  G01N27/416 ,  G01N33/00

CPC classification number: G01N33/004 ,  G01N27/4163 ,  H03M1/002 ,  H03M1/662 ,  H03M1/68 ,  H03M1/765

Abstract: A multiple output, multiple impedance string digital-to-analog converter (DAC) circuit can provide a first output having a first resolution in response to a first digital input signal and a second output having a second resolution in response to a second digital input signal. A main impedance string and a secondary impedance string can be coupled using switching networks to provide a first DAC output. By coupling additional switches to the main impedance string and by sharing the main impedance string, a second DAC output can be realized.