公开(公告)号：US10802520B2

公开(公告)日：2020-10-13

申请号：US13862135

申请日：2013-04-12

Applicant: Keithley Instruments, Inc.

Inventor： Kevin Cawley ,  Wayne Goeke ,  Gregory Sobolewski

IPC: G05F1/575 ,  G01R31/317 ,  H04M1/24

Abstract: A system can include a device under test (DUT) having a DUT voltage, a cable connected to the DUT, the cable having a cable inductance, and a power supply configured as a current source to provide a wide bandwidth voltage source to the DUT, wherein the DUT voltage is independent of the cable inductance.

公开(公告)号：US10338185B2

公开(公告)日：2019-07-02

申请号：US14576702

申请日：2014-12-19

Applicant: Keithley Instruments, Inc.

Inventor： Martin J. Rice

IPC: G01R35/00 ,  G01D18/00 ,  H03M1/10 ,  G01R13/00 ,  G01R19/00

Abstract: A method for calibrating a test instrument having an initial output voltage level and an open output relay can include programming the test instrument for a certain current level, starting a timer, and stopping the timer (responsive to the test instrument entering compliance) to determine a time interval. The method can also include determining whether the time interval is within a desired range.

公开(公告)号：US20170099000A1

公开(公告)日：2017-04-06

申请号：US14876538

申请日：2015-10-06

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/33569 ,  H02M3/337 ,  H02M2001/342 ,  H02M2001/344 ,  Y02B70/1491

Abstract: Embodiments of the present invention provide improved techniques and devices for reducing transformer commutation distortion caused by large load currents. Traditional power supplies which have two or more phases typically commutate a transformer during the end of each phase. When the load current is large, energy stored in the transformer's leakage inductance can cause undesirable effects during commutation. Embodiments of the present invention reduce these effects by lowering the voltage across the primary side of the transformer prior to commutation. In one embodiment, a capacitor is added to the primary side of the transformer. A switch directs current through the capacitor prior to commutation, allowing the capacitor to absorb the transformer's leakage inductance energy and lower the primary side voltage. Other suitable components, such as resistors, diodes, transistors, or additional transformer windings, may also be used to reduce the primary-side voltage prior to commutation.

公开(公告)号：US09559680B2

公开(公告)日：2017-01-31

申请号：US14522838

申请日：2014-10-24

Applicant: Keithley Instruments, Inc.

Inventor： Kyle K. Rakes

IPC: H03K17/0412 ,  H03K17/687 ,  H03K17/689 ,  H03K17/0416 ,  H03K17/785 ,  H03K17/081

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：US20160231354A1

公开(公告)日：2016-08-11

申请号：US15015893

申请日：2016-02-04

Applicant: Keithley Instruments, Inc.

Inventor： Michael D. Rayman ,  Gregory Sobolewski

IPC: G01R1/02 ,  G01R1/04

Abstract: A connection interface for connecting one or more devices under test (DUTs) to one or more remote test and measurement instruments includes a device-under-test connector for connecting a DUT to the interface, a host-instrument connector for connecting the interface to a host test and measurement instrument, and an electrical path between the device-under-test connector and the host-instrument connector. The connection interface also includes a display that has a first portion visually associated with the device-under-test connector and configured to display an identifier for a particular connection point on the DUT. In some embodiments, the first portion of the display is configured to display measurement data from the particular connection point on the DUT. In some embodiments, the display has a second portion that is configured to display information related to the host test and measurement instrument, or to display a name for a particular measurement of the DUT.

Abstract translation: 用于将一个或多个待测器件（DUT）连接到一个或多个远程测试和测量仪器的连接接口包括用于将DUT连接到接口的测试用连接器，用于将接口连接到接口的主机 - 仪器连接器 主机测试和测量仪器，以及被测设备连接器和主机仪器连接器之间的电气路径。 连接接口还包括显示器，其具有与被测设备连接器可视地相关联的第一部分，并且被配置为在DUT上显示特定连接点的标识符。 在一些实施例中，显示器的第一部分被配置为从DUT上的特定连接点显示测量数据。 在一些实施例中，显示器具有被配置为显示与主机测试和测量仪器相关的信息的第二部分，或者显示DUT的特定测量的名称。

公开(公告)号：US20160141948A1

公开(公告)日：2016-05-19

申请号：US14542231

申请日：2014-11-14

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: H02M1/00 ,  H02M3/335

Abstract: A switching power supply can include multiple power MOSFETs that receive an initial gate drive waveform comprising a fast slew rate region having a negative slope and a slow slew rate region also having a negative slope. The MOSFETs can turn off during the slow slew rate region of the initial gate drive waveform.

Abstract translation: 开关电源可以包括多个功率MOSFET，其接收包括具有负斜率的快速压摆率区域和也具有负斜率的慢压摆率区域的初始栅极驱动波形。 在初始栅极驱动波形的缓慢转换速率区域，MOSFET可能会关闭。

公开(公告)号：US09197236B1

公开(公告)日：2015-11-24

申请号：US14568904

申请日：2014-12-12

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke ,  Brian P. Frackelton ,  Benjamin J. Yurick

IPC: G01R13/02 ,  H03M1/12 ,  H03M1/06

CPC classification number: H03M1/20 ,  G01R13/0254 ,  G01R13/0272 ,  G01R19/2509 ,  H03M1/005 ,  H03M1/0634 ,  H03M1/0658 ,  H03M1/1245 ,  H03M1/1265

Abstract: A method for producing sampled data, which as the requested sampling period is increased, each sample is the average of an increasing number of ADC samples such that a maximum number of ADC samples are evenly space across the sample period. The method can include choosing one of multiple ADC with varying speed versus resolution capabilities to further increase the quality of the sampled data as the sampling period increases.

Abstract translation: 一种用于产生采样数据的方法，其随着所请求的采样周期的增加，每个样本是越来越多的ADC采样的平均值，使得ADC采样的最大数量在采样周期内是均匀的空间。 该方法可以包括选择具有不同速度与分辨率能力的多个ADC中的一个，以在采样周期增加时进一步提高采样数据的质量。

公开(公告)号：US20140376201A1

公开(公告)日：2014-12-25

申请号：US13921550

申请日：2013-06-19

Applicant: Keithley Instruments, Inc.

Inventor： James A. Niemann ,  Gregory Sobolewski ,  Martin J. Rice ,  Wayne Goeke

IPC: H05K1/02 ,  H05K3/40 ,  H05K3/46 ,  H05K3/30

CPC classification number: H05K1/0213 ,  H05K1/0225 ,  H05K1/0256 ,  H05K1/142 ,  H05K1/145 ,  H05K3/306 ,  H05K3/4038 ,  H05K3/4697 ,  H05K2201/0792 ,  H05K2201/09063 ,  H05K2201/093 ,  H05K2201/09618 ,  H05K2201/0969 ,  H05K2201/09981 ,  Y10T29/49139

Abstract: A device with low dielectric absorption includes a printed circuit board (PCB), a component connection area including a first conductor layered on a top surface of the component connection area and a second conductor layered on a bottom surface of the component connection area, an aperture surrounding the component connection area, a low-leakage component connecting the component connection area to the PCB across the aperture, and a guard composed of a third conductor at least substantially surrounding the aperture on a top surface of the PCB and a fourth conductor at least substantially surrounding the aperture on a bottom surface of the PCB.

Abstract translation: 具有低介电吸收率的器件包括印刷电路板（PCB），包括层叠在部件连接区域的顶表面上的第一导体的部件连接区域和层叠在部件连接区域的底表面上的第二导体， 围绕部件连接区域，将部件连接区域连接到穿过孔的PCB的低泄漏部件以及由至少基本上围绕PCB顶表面上的孔的第三导体组成的防护件和至少 基本上围绕PCB的底表面上的孔。

公开(公告)号：US20140354354A1

公开(公告)日：2014-12-04

申请号：US13906051

申请日：2013-05-30

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke

IPC: H03F3/45

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：US20140347158A1

公开(公告)日：2014-11-27

申请号：US13902004

申请日：2013-05-24

Applicant: Keithley Instruments, Inc.

Inventor： Wayne C. Goeke ,  John C. Gibbons

IPC: H01F27/36

CPC classification number: H01F27/362 ,  H01F27/288 ,  H01F2027/2833

Abstract: An isolated DC-to-DC switching power supply includes an isolation transformer having a magnetic core, a first winding around the magnetic core, a first winding-shield around the magnetic core, a second winding-shield within the first winding-shield, and a second winding within the second winding-shield. There is no direct coupling between the first winding and the second winding since the second winding is enclosed within the second winding-shield and the second winding-shield is enclosed within the first winding-shield.

Abstract translation: 隔离的DC-DC开关电源包括具有磁芯的隔离变压器，围绕磁芯的第一绕组，围绕磁芯的第一绕组屏蔽，第一绕组屏蔽内的第二绕组屏蔽，以及 在第二绕组屏蔽内的第二绕组。 第一绕组和第二绕组之间没有直接耦合，因为第二绕组被封闭在第二绕组屏蔽内，而第二绕组屏蔽封闭在第一绕组屏蔽内。