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Method for a low-speed DC access point for direct leakage measurement on high-speed links/busses

IP.com Disclosure Number: IPCOM000130477D
Publication Date: 2005-Oct-25
Document File: 5 page(s) / 138K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a low-speed direct current (DC) access point for direct leakage measurement on high-speed links/busses. Benefits include improved functionality, improved performance, and improved design simplicity.

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Method for a low-speed DC access point for direct leakage measurement on high-speed links/busses

Disclosed is a method for a low-speed direct current (DC) access point for direct leakage measurement on high-speed links/busses. Benefits include improved functionality, improved performance, and improved design simplicity.

Background

              Conventional leakage measurement uses a mechanical relay on a loadboard to switch between full-speed loopback testing and automated test equipment (ATE) or other measuring instruments. Typical loop-back input/output (I/O) tests require a relay to provide DC access to silicon pads for leakage/short test coverage (see Figure 1).

              The conventional solution can result in several problems, such as the following:

•             Larger form factor, which prevents placement close to the device under test (DUT)

•             Poor relay reliability

•             Expensive tester resources for switch control

•             Longer test time due to a long settling time to set the switch

General description

              The disclosed method is a low-speed DC access point for direct leakage measurement on high-speed links/busses. The method provides direct access to measure leakage on the pads and full-speed loopback to provide high-speed test coverage.

              The key elements of the disclosed method include:
•             Discrete off-the-shelf choke inductors

•             Lay-out rules to avoid standing wave stub resonance

Advantages

              The disclosed method provides technical advantages, including:

•             Improved functionality due to providing a low-speed direct current (DC) access point for direct leakage measurement on high-speed links/busses

•             Improved functionality due to providing improved loadboard surface area utilization due by decreasing the component size (compared to typical mechanical relays)

•             Improved functionality due to providing a tester that is always ON, eliminating the switching delay

•             Improved performance due to providing a shorter trace loop, improving the bandwidth of the channels for faster data rate (lower losses)

•             Improved design simplici...