公开(公告)号：US5818714A

公开(公告)日：1998-10-06

申请号：US690778

申请日：1996-08-01

Applicant: Hehong Zou ,  Scott E. Brigham

Inventor： Hehong Zou ,  Scott E. Brigham

IPC: G05B13/04 ,  G06B13/02

CPC classification number: G05B13/042

Abstract: A process control system controls a non-self regulating process through a control output signal based on a set point and a measured process variable. The process control system includes a control circuit having a set point input, a process variable input and a control output. The control circuit generates the control output signal on the control output as a function of the set point received on the set point input and the measured process variable received on the process variable input. An auto-tuning circuit excites the process, estimates a process model based on an intersection between rising and falling asymptotes of the measured process variable, and then tunes the control function to the process based on the process model. The auto-tuning circuit obtains robust results, but is computationally simple such that the circuit can be implemented with hardware or software in low-power and low-memory applications, such as in field-mounted controllers.

Abstract translation: 过程控制系统通过基于设定点和测量过程变量的控制输出信号来控制非自调节过程。 过程控制系统包括具有设定点输入，过程变量输入和控制输出的控制电路。 控制电路根据设定点输入端接收的设定点和过程变量输入端接收的测量过程变量，在控制输出端产生控制输出信号。 自动调谐电路激励过程，基于测量过程变量的上升和下降渐近线之间的交点估计过程模型，然后根据过程模型调整控制功能到过程。 自动调谐电路获得了可靠的结果，但是计算上简单，因此电路可以在低功耗和低内存应用中的硬件或软件实现，如现场安装的控制器。

公开(公告)号：US20110215870A1

公开(公告)日：2011-09-08

申请号：US13041180

申请日：2011-03-04

Applicant: Zhihao Lao ,  Hehong Zou

Inventor： Zhihao Lao ,  Hehong Zou

IPC: H03F3/45

CPC classification number: H03F3/45475 ,  H03F3/45973 ,  H03F2200/375 ,  H03F2200/411 ,  H03F2203/45212 ,  H03F2203/45511 ,  H03F2203/45512 ,  H03F2203/45521 ,  H03F2203/45528

Abstract: An integrator circuit cancels a DC offset component related to an average DC value of a burst mode input signal from the output of an amplifier. The integrator circuit outputs an average DC value of the input signal in a response time that is shorter than the preamble of a burst mode signal. The integrator output signal remains stable within selected amplitude limits for a length of time corresponding to the data portion of a burst mode signal. A transimpedance amplifier embodiment of the invention comprises a TIA gain stage, an integrator, and a voltage-controlled current course. Other embodiments comprise an amplifier for converting single-ended input signals to differential output signals, an amplifier for differential output offset cancellation, a monolithic semiconductor integrated circuit die, and a packaged semiconductor integrated circuit device.

Abstract translation: 积分器电路从放大器的输出消除与突发模式输入信号的平均DC值相关的DC偏移分量。 积分器电路在比突发模式信号的前导码短的响应时间内输出输入信号的平均DC值。 积分器输出信号在与突发模式信号的数据部分相对应的时间长度内，在选定的幅度范围内保持稳定。 本发明的跨阻放大器实施例包括TIA增益级，积分器和电压控制电流过程。 其他实施例包括用于将单端输入信号转换为差分输出信号的放大器，用于差分输出偏移消除的放大器，单片半导体集成电路管芯和封装的半导体集成电路器件。

公开(公告)号：US08310310B2

公开(公告)日：2012-11-13

申请号：US13041180

申请日：2011-03-04

Applicant: Zhihao Lao ,  Hehong Zou

Inventor： Zhihao Lao ,  Hehong Zou

IPC: H03F3/45

CPC classification number: H03F3/45475 ,  H03F3/45973 ,  H03F2200/375 ,  H03F2200/411 ,  H03F2203/45212 ,  H03F2203/45511 ,  H03F2203/45512 ,  H03F2203/45521 ,  H03F2203/45528

Abstract: An integrator circuit cancels a DC offset component related to an average DC value of a burst mode input signal from the output of an amplifier. The integrator circuit outputs an average DC value of the input signal in a response time that is shorter than the preamble of a burst mode signal. The integrator output signal remains stable within selected amplitude limits for a length of time corresponding to the data portion of a burst mode signal. A transimpedance amplifier embodiment of the invention comprises a TIA gain stage, an integrator, and a voltage-controlled current course. Other embodiments comprise an amplifier for converting single-ended input signals to differential output signals, an amplifier for differential output offset cancellation, a monolithic semiconductor integrated circuit die, and a packaged semiconductor integrated circuit device.

Abstract translation: 积分器电路从放大器的输出消除与突发模式输入信号的平均DC值相关的DC偏移分量。 积分器电路在比突发模式信号的前导码短的响应时间内输出输入信号的平均DC值。 积分器输出信号在与突发模式信号的数据部分相对应的时间长度内，在选定的幅度范围内保持稳定。 本发明的跨阻放大器实施例包括TIA增益级，积分器和电压控制电流过程。 其他实施例包括用于将单端输入信号转换为差分输出信号的放大器，用于差分输出偏移消除的放大器，单片半导体集成电路管芯和封装的半导体集成电路器件。

公开(公告)号：US20090110409A1

公开(公告)日：2009-04-30

申请号：US12288982

申请日：2008-10-24

Applicant: Hehong Zou ,  Krishna Shivaram ,  Daniel Draper

Inventor： Hehong Zou ,  Krishna Shivaram ,  Daniel Draper

IPC: H04B10/06 ,  H03F1/34 ,  H03F3/16 ,  H03F3/68

CPC classification number: H03F3/082

Abstract: The invention relates to amplifiers and in particular, to a transimpedance amplifier for high rate applications. Disclosed is a two stage transimpedance amplifier having a first stage comprising an amplifier and a load and a second stage comprising an amplifier and a resistor. Negative feedback is provided through a feedback resistor. Only two voltage conversions occur which reduces phase distortion, as compared to three stage transimpedance amplifiers which perform 3 voltage conversions.

Abstract translation: 本发明涉及放大器，特别涉及用于高速应用的跨阻放大器。 公开了一种具有第一级的两级跨阻抗放大器，包括放大器和负载，第二级包括放大器和电阻器。 通过反馈电阻提供负反馈。 与执行3次电压转换的三级跨阻抗放大器相比，仅发生两次电压转换，从而降低相位失真。

公开(公告)号：US08509629B2

公开(公告)日：2013-08-13

申请号：US12288982

申请日：2008-10-24

Applicant: Hehong Zou ,  Krishna Shivaram ,  Daniel Draper

Inventor： Hehong Zou ,  Krishna Shivaram ,  Daniel Draper

IPC: H04B10/06 ,  H03F1/34 ,  H03F3/68

CPC classification number: H03F3/082

Abstract: The invention relates to amplifiers and in particular, to a transimpedance amplifier for high rate applications. Disclosed is a two stage transimpedance amplifier having a first stage comprising an amplifier and a load and a second stage comprising an amplifier and a resistor. Negative feedback is provided through a feedback resistor. Only two voltage conversions occur which reduces phase distortion, as compared to three stage transimpedance amplifiers which perform 3 voltage conversions.

公开(公告)号：US5691896A

公开(公告)日：1997-11-25

申请号：US515410

申请日：1995-08-15

Applicant: Hehong Zou ,  Kale P. Hedstrom ,  Jogesh Warrior ,  Coy L. Hays

Inventor： Hehong Zou ,  Kale P. Hedstrom ,  Jogesh Warrior ,  Coy L. Hays

IPC: G05B13/02 ,  G05B11/42 ,  G05B13/04 ,  G05B23/02

CPC classification number: G05B13/042 ,  G05B11/42

Abstract: A process control system controls a process through a control output signal based on a set point and a measured process variable. The process control system includes a control circuit having a set point input, a process variable input and a control output. The control circuit generates the control output signal on the control output as a function of the set point received on the set point input and the measured process variable received on the process variable input. An auto-tuning circuit excites the process, estimates a process model based on a rising dead time, a rising rate-of-change, a falling dead time and a falling rate-of-change in the measured process variable and then tunes the control function to the process based on the process model. The auto-tuning circuit obtains robust results, but is computationally simple such that the circuit can be implemented with hardware or software in low-power and low-memory applications, such as in such in field-mounted control units.

Abstract translation: 过程控制系统通过基于设定点和测量过程变量的控制输出信号控制过程。 过程控制系统包括具有设定点输入，过程变量输入和控制输出的控制电路。 控制电路根据设定点输入端接收的设定点和过程变量输入端接收的测量过程变量，在控制输出端产生控制输出信号。 自动调谐电路激励该过程，基于上升的死区时间，上升的变化率，下降的死区时间和下降的测量过程变量的变化估计一个过程模型，然后调整控制 基于过程模型的过程的功能。 自动调谐电路获得了可靠的结果，但是在计算上很简单，因此电路可以在低功耗和低内存应用中的硬件或软件实现，例如在现场安装的控制单元中。

公开(公告)号：US5812428A

公开(公告)日：1998-09-22

申请号：US853809

申请日：1997-05-09

Applicant: Hehong Zou ,  Coy L. Hays

Inventor： Hehong Zou ,  Coy L. Hays

IPC: G05B13/02 ,  G05B13/04

CPC classification number: G05B13/042 ,  G05B13/021 ,  Y10S388/907

Abstract: A process controller controls an integrating-type process based on a measured process variable and a set point. The process controller includes an error generating circuit, a non-integrating control circuit and an adaptive bias circuit. The error generating circuit generates an error signal based on a difference between the set point and the measured process variable. The control circuit generates a control signal as a function of the error signal. The adaptive bias circuit adds a bias value to the control signal, the measured process variable or the set point. The bias value is selectively updated as a function of the error signal to force the error signal toward zero.

Abstract translation: 过程控制器基于测量的过程变量和设定点来控制积分型过程。 过程控制器包括误差产生电路，非积分控制电路和自适应偏置电路。 误差产生电路基于设定点和测量过程变量之间的差产生误差信号。 控制电路产生作为误差信号的函数的控制信号。 自适应偏置电路将偏置值添加到控制信号，测量过程变量或设定点。 偏置值被有选择地更新为误差信号的函数，以迫使误差信号为零。