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：US20180196101A1

公开(公告)日：2018-07-12

申请号：US15433862

申请日：2017-02-15

Applicant: Analog Devices Global

Inventor： Guangyang Qu ,  Yincai Tony Liu ,  Baotian Hao ,  Hanqing Wang ,  Hengfang Mei ,  Rengui Luo ,  Yimiao Zhao ,  Junbiao Ding

IPC: G01R31/28 ,  G01N27/416 ,  G01N27/12 ,  G01N33/00

CPC classification number: G01R31/2829 ,  G01N27/122 ,  G01N27/4163 ,  G01N33/0057 ,  G01R27/02 ,  G01R27/16 ,  G01R35/005

Abstract: An apparatus comprises a load resistance connectable in series with the electronic sensor to form a series resistance of the load resistance and the internal impedance of the electronic sensor; an excitation circuit configured to apply a predetermined voltage to a circuit element; and a measurement circuit configured to: initiate applying the predetermined voltage to the series resistance and determining the series resistance; initiate applying the predetermined voltage to the load resistance and determining the load resistance; and calculate the internal impedance of the sensor using the determined series resistance and the load resistance, and provide the calculated internal impedance to a user or process.

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.

公开(公告)号：US20180076780A1

公开(公告)日：2018-03-15

申请号：US15600542

申请日：2017-05-19

Applicant: Analog Devices Global

Inventor： Hanqing Wang ,  Gerard Mora-Puchalt

IPC: H03F3/00 ,  H03F3/42 ,  H03F3/45 ,  H03F3/393 ,  H03F1/02 ,  H03F1/56 ,  H03F1/32

CPC classification number: H03F3/005 ,  H03F1/02 ,  H03F1/14 ,  H03F1/3211 ,  H03F1/56 ,  H03F3/387 ,  H03F3/393 ,  H03F3/426 ,  H03F3/45071 ,  H03F3/45475 ,  H03F2200/213 ,  H03F2200/267 ,  H03F2200/271 ,  H03F2200/378 ,  H03F2203/45458 ,  H03F2203/45514 ,  H03M3/00 ,  H03M3/496

Abstract: A capacitive gain amplifier circuit amplifies an input signal by a pair of differential amplifier circuits couples in series. The first differential amplifier circuit is reset during an autozero phase while disconnected from the second differential amplifier circuit, and the first and second differential amplifier circuits are connected together in series during a chop phase. A set of feedback capacitors is selectively switched in between respective outputs of the second differential amplifier circuit and respective inputs of the first differential amplifier circuit during the chop phase.