Frequency Offset Testing System for PCI-Express Compliance
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Solution Overview
Problem
Current methods for testing frequency offset compliance in high-speed electronic devices, such as those adhering to the PCI-Express specification, are inefficient and economically viable only for single port devices, necessitating a more efficient automatic test equipment system for high-volume production.
Innovation Solution
A system comprising two automatic test equipment devices that provide a reference clock signal and adjust frequencies to simulate frequency offsets, using coherent sampling techniques to test electronic devices for compliance with PCI-Express specifications, allowing for testing across a range of frequency offsets with a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bench-type equipment with independent clock sources is used for frequency offset testing, then measurement precision is improved, but device complexity and testing cost increase
Solution Approach 1:
The patent merges the clock signal generation and data transmission functions into a single integrated testing device. The testing device generates both the reference clock signal and the test data signals, eliminating the need for separate independent clock sources and signal generators. This integration reduces system complexity while maintaining measurement precision through controlled frequency offset generation.
Solution Approach 2:
The testing device is designed with multi-functionality to perform both clock signal generation and data transmission testing. The device can operate in multiple modes: as a clock signal generator, as a data transmitter, or as a combined testing system. This universal design allows a single device to replace multiple specialized instruments, reducing overall system complexity while maintaining comprehensive testing capabilities.
2Measurement precision
If traditional bench-type testing methods are used, then measurement precision is maintained, but productivity decreases due to manual testing processes
Solution Approach 1:
The testing device incorporates automatic frequency offset generation and measurement capabilities. The system automatically generates frequency offsets according to test specifications, automatically measures the offset values, and automatically evaluates compliance without requiring manual intervention. This self-service capability maintains measurement precision while dramatically improving productivity by eliminating manual testing steps and accelerating the testing cycle.
Solution Approach 2:
The testing device enables continuous automated testing operations. The system can continuously generate test signals, measure frequency offsets, and evaluate compliance without interruption or manual setup changes. This continuous operation maintains consistent measurement precision while significantly increasing testing throughput compared to manual bench-type methods that require setup, adjustment, and analysis between measurements.
3Productivity
If multiple digital channel resources are deployed in ATE systems, then productivity is improved for high-volume production, but device complexity increases
Solution Approach 1:
The testing device is segmented into distinct functional modules: a clock signal generation module, a data transmission module, and a measurement evaluation module. Each module operates independently but coordinates through standardized interfaces, allowing the system to handle multiple digital channels without proportionally increasing overall complexity. This modular segmentation enables high-volume production testing capability while keeping individual module complexity manageable.
Data Source
AI summary
Described is a system and method for frequency offset testing. The system comprises an electronic device, a first testing device providing a reference clock signal at a first frequency to the electronic device, and a second testing device receiving data from the electronic device at the first frequency and transmitting data to the electronic device at a second frequency. The second frequency is equal to a product of the first frequency and a frequency offset value.