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Determining electrical path length

An electrical path and signal path technology, applied in the field of electrical path length, can solve the problems of ATE unable to perform TDR measurement, unreliable TDR, etc.

Active Publication Date: 2018-07-17
TERADYNE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TDR can be unreliable in certain situations, such as when the signal rise time exceeds the electrical path length of the transmission line
Also, ATE may not be able to perform TDR measurements

Method used

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  • Determining electrical path length
  • Determining electrical path length
  • Determining electrical path length

Examples

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Embodiment Construction

[0017] Example ATEs herein may be configured to determine the electrical path length of a transmission line, such as a transmission line through a DIB, and to use this information for purposes including, but not limited to, signal alignment and detecting breaks or shorts in a transmission line. The example ATE is configured to inject current into a transmission line, which has a known capacitance per unit length; in response to the current, detect the change in voltage on the transmission line over time (the rate of change of voltage); determine based on the change in voltage over time a capacitance of the transmission line; and determining an electrical path length of the transmission line based on the determined capacitance of the transmission line and the known capacitance per unit length. In this example, electrical path length refers to the distance on a transmission line that carries an electrical signal between two points.

[0018] An example transmission line with cont...

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PUM

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Abstract

The present invention provides an example process for determining electrical path lengths. The example process comprises the steps of: injecting current into a transmission line having a known capacitance per unit of length; determining a rate of change in voltage on the transmission line in response to the current; determining a capacitance of the transmission line based on the change in voltage;and determining an electrical path length of the transmission line based on the determined capacitance of the transmission line and the known capacitance per unit of length.

Description

technical field [0001] This specification generally relates to determining the electrical path length of a transmission line based on the capacitance of the transmission line. Background technique [0002] Automatic test equipment (ATE) includes electronics for sending signals to and receiving signals from a device under test (DUT) in order to test the operation of the DUT. ATE includes test instruments, such as digital test instruments for performing digital tests on integrated circuits. Test instruments typically reside on the test head. A Device Interface Board (DIB), which is typically provided by the DUT manufacturer and not manufactured with the ATE, connects the test heads, thereby connecting the test instrumentation to the DUT. Transmission lines pass through the DIB; however, the electrical path length of these transmission lines is not known to ATE. However, this information can be used for various purposes including, but not limited to, aligning signals and det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26G01R19/12
CPCG01R31/31901G01R31/3191G01R1/24G01D5/24G01R19/12G01R27/2605G01R31/2834G01R31/2889H03K17/955G01R27/26G06V40/1306G01B7/02
Inventor 马可·斯皮尔曼
Owner TERADYNE