公开(公告)号：US09453880B2

公开(公告)日：2016-09-27

申请号：US14163725

申请日：2014-01-24

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: G01R15/00 ,  G01R27/08 ,  G01R31/317 ,  G01R1/20

CPC classification number: G01R31/31721 ,  G01R1/203

Abstract: An active shunt source-measure unit (SMU) circuit can include an SMU or power supply having an active shunt circuit that is integrated with the current measuring sub-circuit of the SMU circuit. The active shunt circuit may be active during voltage sourcing of the SMU circuit and deactivated during current sourcing of the SMU circuit.

Abstract translation: 主动分流源测量单元（SMU）电路可以包括具有与SMU电路的电流测量子电路集成的有源分流电路的SMU或电源。 在SMU电路的电压源期间，有源分流电路可能有效，并且在SMU电路的电流源期间被禁用。

公开(公告)号：US20160149560A1

公开(公告)日：2016-05-26

申请号：US14566534

申请日：2014-12-10

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: H03K3/01

CPC classification number: H03K3/01 ,  G01R1/36 ,  H02H9/04

Abstract: A voltage clamp circuit which operates using a voltage controlled current source where the change of the polarity of the voltage controlled current source controls whether it is clamping or not. While clamping, the stability of the control loop uses the capacitance of the output to create and single pole roll-off of the loop gain and while not clamping, uses the capacitance of the circuit which sets the clamping voltage to produce the roll-off. The circuit operates in a linear fashion both while clamping and not clamping, which allows for a faster response when clamping is needed.

Abstract translation: 一种电压钳位电路，其使用电压控制电流源工作，其中电压控制电流源的极性的变化控制其是否被钳位。 在钳位时，控制回路的稳定性使用输出的电容产生环路增益的单极滚降，同时在不夹紧的情况下，使用设置钳位电压的电路的电容产生滚降。 电路以线性方式工作，同时夹紧和不夹紧，这允许在需要夹紧时更快的响应。

公开(公告)号：US09335364B2

公开(公告)日：2016-05-10

申请号：US13901430

申请日：2013-05-23

Applicant: Keithley Instruments, Inc.

Inventor： James A. Niemann

IPC: G01R31/26

CPC classification number: G01R31/2601 ,  G01R31/2607 ,  G01R31/2612

Abstract: An RF testing method and system by which a DC measurement pathway can also act like a properly terminated RF pathway. Achieving this requires that the output HI, LO, and Sense HI conductors are terminated in a frequency selective manner such that the terminations do not affect the SMU DC measurements. Once all SMU input/output impedances are controlled, as well as properly terminated to eliminate reflections, the high-speed devices will no longer oscillate during device testing, so long as the instruments maintain a high isolation from instrument-to-instrument (separate instruments are used on the gate and drain, or on the input and output of the device). The output of HI, LO and Sense HI conductors are coupled to various nodes of the DUT via three triaxial cables, the outer shieldings of which are coupled to each other and to an SMU ground.

Abstract translation: RF测试方法和系统，通过该测试方法和系统，DC测量路径也可以像正确终止的RF路径那样起作用。 实现这一点要求输出HI，LO和Sense HI导体以频率选择性方式终止，使得终端不影响SMU DC测量。 一旦所有的SMU输入/输出阻抗被控制，并且正确终止以消除反射，高速器件将不再在器件测试期间振荡，只要仪器保持与仪器到仪器的高度隔离（分离的仪器 用于栅极和漏极，或器件的输入和输出）。 HI，LO和感测HI导体的输出通过三根三轴电缆耦合到DUT的各个节点，其外屏蔽彼此耦合并连接到SMU接地。

公开(公告)号：US20160084878A1

公开(公告)日：2016-03-24

申请号：US14846121

申请日：2015-09-04

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke ,  Gregory Sobolewski

IPC: G01R1/04 ,  G01R27/28 ,  G01R31/28

CPC classification number: G01R1/0416 ,  G01R27/28 ,  G01R31/06 ,  G01R31/18 ,  G01R31/24 ,  G01R31/2607 ,  G01R31/2822 ,  G01R31/2889

Abstract: Embodiments of the present invention provide an improved two-cable connection system for connecting electrical test instrumentation to a device under test (DUT). In one embodiment, a single pair of equal-length triaxial cables each has a desired characteristic impedance. Each cable has a center connecter, intermediate conductor, and outer conductor. The proximal end of each cable is connected to the test instrumentation, and the distal ends are located at the DUT. At the distal end, the center conductors are connected to the DUT, the intermediate conductors are allowed to float, and the outer conductors are connected to each other. The proximal end of each cable is connected to the device using an appropriate connection for the test that will be performed. This allows the test instrumentation to perform different types of tests without changing connections to the DUT.

Abstract translation: 本发明的实施例提供了一种用于将电测试仪器连接到被测器件（DUT）的改进的双电缆连接系统。 在一个实施例中，单对等长三轴电缆各具有期望的特性阻抗。 每个电缆都有一个中心连接器，中间导体和外部导体。 每个电缆的近端连接到测试仪器，并且远端位于DUT。 在远端，中心导体连接到DUT，允许中间导体浮动，外导体彼此连接。 每个电缆的近端使用适当的连接连接到设备，用于要执行的测试。 这允许测试仪器执行不同类型的测试，而不改变与DUT的连接。

公开(公告)号：US20150270823A1

公开(公告)日：2015-09-24

申请号：US14521969

申请日：2014-10-23

Applicant: Keithley Instruments, Inc.

Inventor： Gregory Sobolewski

IPC: H03H7/46 ,  G01R19/00 ,  G01R27/02

CPC classification number: H03H7/465 ,  G01R19/00 ,  G01R19/0015 ,  G01R27/025 ,  G01R31/2822 ,  G01R31/2889 ,  H01P1/2007 ,  H01P5/00 ,  H03H7/0123 ,  H03H7/46

Abstract: Bias tees, according to certain embodiments of the present invention, include switches in the AC signal path, the DC signal path, or both, to improve the capability of the bias tees to be used for high impedance AC measurement, low current DC measurement, or both. Optical control of the switches, as well as control of the switches using a DC bias present within the AC signal input to the bias tee, is described. Including a set of diodes into the DC signal path, rather than a switch, provides enhanced capability of the bias tee to be used for high impedance AC measurements.

Abstract translation: 根据本发明的某些实施例的偏置三通包括交流信号路径，直流信号路径或两者中的开关，以提高偏置三通的能力用于高阻抗AC测量，低电流DC测量， 或两者。 描述了开关的光学控制，以及使用存在于输入到偏置三通的AC信号内的DC偏压来控制开关。 将一组二极管包括在DC信号路径中，而不是开关，提供了用于高阻抗AC测量的偏置三通的增强功能。

公开(公告)号：US20150222257A1

公开(公告)日：2015-08-06

申请号：US14522838

申请日：2014-10-24

Applicant: Keithley Instruments, Inc.

Inventor： Kyle K. Rakes

IPC: H03K17/0412 ,  H03K17/689 ,  H03K17/687

CPC classification number: H03K17/04123 ,  H03K17/04163 ,  H03K17/08104 ,  H03K17/6871 ,  H03K17/6877 ,  H03K17/689 ,  H03K17/785

Abstract: A circuit structured to drive an isolated high speed voltage metal-oxide-semiconductor field-effect transistor (MOSFET) switch, including a first MOSFET and a second MOSFET configured to operate as a switch, a capacitor, a charging component in parallel with the capacitor, a first switch in series with the charging component, and a second switch in parallel with the charging component and the capacitor. The stored voltage in the capacitor is sent to the gates of the first MOSFET and the second MOSFET when a second switch is open and a first switch is closed.

Abstract translation: 一种构造成驱动隔离的高速度电压的金属氧化物半导体场效应晶体管（MOSFET）开关的电路，包括配置为用作开关的第一MOSFET和第二MOSFET，电容器，与电容器并联的充电元件 ，与充电部件串联的第一开关，以及与充电部件和电容器并联的第二开关。 当第二开关断开并且第一开关闭合时，电容器中存储的电压被发送到第一MOSFET和第二MOSFET的栅极。

公开(公告)号：US20150212110A1

公开(公告)日：2015-07-30

申请号：US14163725

申请日：2014-01-24

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: G01R1/04 ,  G01R19/00

CPC classification number: G01R31/31721 ,  G01R1/203

Abstract: An active shunt source-measure unit (SMU) circuit can include an SMU or power supply having an active shunt circuit that is integrated with the current measuring sub-circuit of the SMU circuit. The active shunt circuit may be active during voltage sourcing of the SMU circuit and deactivated during current sourcing of the SMU circuit.

Abstract translation: 主动分流源测量单元（SMU）电路可以包括具有与SMU电路的电流测量子电路集成的有源分流电路的SMU或电源。 在SMU电路的电压源期间，有源分流电路可能有效，并且在SMU电路的电流源期间被禁用。

公开(公告)号：US09077301B2

公开(公告)日：2015-07-07

申请号：US13906051

申请日：2013-05-30

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: H03F1/02 ,  H03F3/45 ,  H03F1/30 ,  H03F3/38

CPC classification number: H03F3/45 ,  H03F1/303 ,  H03F3/38 ,  H03F3/45475

Abstract: A circuit can include operational amplifier having a first input, a second input, and an output, first and second resistors in series between the output of the op-amp and a ground, and multiple switches configurable to toggle the circuit between a positive phase and a negative phase.

Abstract translation: 电路可以包括运算放大器，其具有第一输入，第二输入和输出，串联在运算放大器的输出和地之间的第一和第二电阻器，以及多个开关，其可配置为在正相和 一个负相。

公开(公告)号：US20140285181A1

公开(公告)日：2014-09-25

申请号：US13849265

申请日：2013-03-22

Applicant: Keithley Instruments, Inc.

Inventor： Wayne Goeke

IPC: G01R19/25

CPC classification number: G01R19/2503 ,  G01R15/22

Abstract: A system may include two input terminals, e.g., HI and LO, and a floating circuit that is physically separate from the input terminals and includes a gain amplifier. The floating circuit can be surrounded by a conductive enclosure that is electrically connected to the second input terminal. The floating circuit can further switch between input signals received from the first and second input terminals to the gain amplifier and the floating circuit ground.

Abstract translation: 系统可以包括两个输入端子，例如，HI和LO，以及物理上与输入端子分离并包括增益放大器的浮置电路。 浮动电路可以被电连接到第二输入端子的导电外壳包围。 浮动电路可以进一步在从第一和第二输入端子接收的输入信号之间切换到增益放大器和浮置电路接地。