公开(公告)号：US09030239B1

公开(公告)日：2015-05-12

申请号：US14143024

申请日：2013-12-30

Applicant: Google Inc.

Inventor： Alireza Dastgheib ,  Brian Otis

IPC: G05F3/02 ,  G01N27/48 ,  G01N27/00

CPC classification number: G01N27/3273 ,  G01N27/00 ,  G01N27/002 ,  G01N27/48 ,  G01N33/48785 ,  G05F3/02

Abstract: A potentiostat includes a voltage regulator, a current mirror, a capacitor, a comparator, a current source, and a counter. The voltage regulator maintains a voltage on a working electrode of an electrochemical sensor. The current mirror develops a mirror current that mirrors an input current from the working electrode. The capacitor is alternately charged by the mirror current, causing the capacitor voltage to increase at a rate related to the current's magnitude, and discharged by a control current, causing the capacitor voltage to decrease. The comparator outputs a waveform that includes upward and downward transitions based on the variations of the capacitor voltage. The current source produces the control current based on the waveform. The counter counts the number of upward or downward transitions in the waveform during a predetermined sampling period to produce a digital output. The digital output is representative of the magnitude of the input current.

Abstract translation: 恒电位仪包括电压调节器，电流镜，电容器，比较器，电流源和计数器。 电压调节器在电化学传感器的工作电极上保持电压。 电流镜产生反射来自工作电极的输入电流的反射镜电流。 电容器由反射镜电流交替地充电，使得电容器电压以与电流幅度相关的速率增加，并通过控制电流放电，导致电容器电压降低。 比较器基于电容器电压的变化输出包括向上和向下转换的波形。 电流源根据波形产生控制电流。 计数器在预定采样周期内对波形中的向上或向下转换的数量进行计数以产生数字输出。 数字输出代表输入电流的大小。

公开(公告)号：US20150226692A1

公开(公告)日：2015-08-13

申请号：US14688590

申请日：2015-04-16

Applicant: Google Inc.

Inventor： Alireza Dastgheib ,  Brian Otis

IPC: G01N27/327

CPC classification number: G01N27/3273 ,  G01N27/00 ,  G01N27/002 ,  G01N27/48 ,  G01N33/48785 ,  G05F3/02

Abstract: A potentiostat includes a voltage regulator, a current mirror, a capacitor, a comparator, a current source, and a counter. The voltage regulator maintains a voltage on a working electrode of an electrochemical sensor. The current mirror develops a mirror current that mirrors an input current from the working electrode. The capacitor is alternately charged by the mirror current, causing the capacitor voltage to increase at a rate related to the current's magnitude, and discharged by a control current, causing the capacitor voltage to decrease. The comparator outputs a waveform that includes upward and downward transitions based on the variations of the capacitor voltage. The current source produces the control current based on the waveform. The counter counts the number of upward or downward transitions in the waveform during a predetermined sampling period to produce a digital output. The digital output is representative of the magnitude of the input current.

Abstract translation: 恒电位仪包括电压调节器，电流镜，电容器，比较器，电流源和计数器。 电压调节器在电化学传感器的工作电极上保持电压。 电流镜产生反射来自工作电极的输入电流的反射镜电流。 电容器由反射镜电流交替地充电，使得电容器电压以与电流幅度相关的速率增加，并通过控制电流放电，导致电容器电压降低。 比较器基于电容器电压的变化输出包括向上和向下转换的波形。 电流源根据波形产生控制电流。 计数器在预定采样周期内对波形中的向上或向下转换的数量进行计数以产生数字输出。 数字输出代表输入电流的大小。