公开(公告)号：US20130162297A1

公开(公告)日：2013-06-27

申请号：US13720511

申请日：2012-12-19

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Mirko Gravati ,  Claudio Cantoro

IPC: G01R19/04

CPC classification number: G01R19/04 ,  H03K5/1532

Abstract: A peak detector circuit receives an oscillating power supply signal. A capacitor is selectably coupled to the signal and charged to a value corresponding to a peak value of the signal. A switch is then opened to isolate the capacitor. A comparator continually compares the signal with the value stored on the capacitor. When the signal rises to within a selected threshold, relative to the stored value, the comparator produces a command signal to close the switch, again coupling the capacitor to the signal. The peak detector can also include a tracking circuit that controls the capacitor to track the oscillating signal while the switch is closed, a timer circuit configured to close the switch and activate the tracking circuit if more than a selected time passes without production of a command signal, and a circuit configured to control the polarity of a leakage current of the capacitor.

公开(公告)号：US08884654B2

公开(公告)日：2014-11-11

申请号：US13720511

申请日：2012-12-19

Applicant: STMicroelectronics S.r.l.

Inventor： Mirko Gravati ,  Claudio Cantoro

IPC: H03K5/153 ,  H03K5/1532 ,  G01R19/04

CPC classification number: G01R19/04 ,  H03K5/1532

Abstract: A peak detector circuit receives an oscillating power supply signal. A capacitor is selectably coupled to the signal and charged to a value corresponding to a peak value of the signal. A switch is then opened to isolate the capacitor. A comparator continually compares the signal with the value stored on the capacitor. When the signal rises to within a selected threshold, relative to the stored value, the comparator produces a command signal to close the switch, again coupling the capacitor to the signal. The peak detector can also include a tracking circuit that controls the capacitor to track the oscillating signal while the switch is closed, a timer circuit configured to close the switch and activate the tracking circuit if more than a selected time passes without production of a command signal, and a circuit configured to control the polarity of a leakage current of the capacitor.

Abstract translation: 峰值检测器电路接收振荡电源信号。 电容器可选地耦合到信号并充电到与信号的峰值对应的值。 然后打开开关以隔离电容器。 比较器连续地将信号与存储在电容器上的值进行比较。 当信号上升到所选择的阈值内时，相对于存储的值，比较器产生一个命令信号来闭合开关，再次将电容器耦合到信号上。 峰值检测器还可以包括跟踪电路，该跟踪电路控制电容器在开关闭合时跟踪振荡信号;定时器电路被配置为关闭开关并激活跟踪电路，如果多于选定的时间经过，而不产生指令信号 以及被配置为控制电容器的漏电流的极性的电路。

公开(公告)号：US20130162296A1

公开(公告)日：2013-06-27

申请号：US13720236

申请日：2012-12-19

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Mirko Gravati ,  Claudio Cantoro

IPC: G01R19/04

CPC classification number: G01R19/04 ,  H03K5/1532

Abstract: A peak detector circuit receives an oscillating power supply signal. A capacitor is selectably coupled to the signal and charged to a value corresponding to a peak value of the signal. A switch is then opened to isolate the capacitor. A comparator continually compares the signal with the value stored on the capacitor. When the signal rises to within a selected threshold, relative to the stored value, the comparator produces a command signal to close the switch, again coupling the capacitor to the signal. The peak detector can also include a tracking circuit that controls the capacitor to track the oscillating signal while the switch is closed, a timer circuit configured to close the switch and activate the tracking circuit if more than a selected time passes without production of a command signal, and a circuit configured to control the polarity of a leakage current of the capacitor.

Abstract translation: 峰值检测器电路接收振荡电源信号。 电容器可选地耦合到信号并充电到与信号的峰值对应的值。 然后打开开关以隔离电容器。 比较器连续地将信号与存储在电容器上的值进行比较。 当信号上升到所选择的阈值内时，相对于存储的值，比较器产生一个命令信号来闭合开关，再次将电容器耦合到信号上。 峰值检测器还可以包括跟踪电路，该跟踪电路控制电容器在开关闭合时跟踪振荡信号;定时器电路被配置为关闭开关并激活跟踪电路，如果多于选定的时间经过，而不产生命令信号 以及被配置为控制电容器的漏电流的极性的电路。