Data Capture Tracker Circuit for High-Frequency Strobe Synchronization
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Solution Overview
Problem
In automated test equipment systems, high-frequency clock synchronization is critical for accurate testing of integrated circuit devices, but inaccuracies in clock and data synchronization can lead to false test results due to increased jitter at high operating speeds, making it challenging to detect response data signals effectively.
Innovation Solution
A digital data signal capture circuit that includes a transition detector, strobe adjustment circuit, and clock generator to synchronize the tester clock signals with incoming DUT response data signals, adjusting the strobe signal to detect transitions midway between jitter bands, thereby improving synchronization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency clock signals are used to increase testing speed, then productivity is improved, but measurement precision deteriorates due to increased jitter and synchronization errors
Solution Approach 1:
The patent implements a feedback mechanism where the detected data transition timing is fed back to adjust the strobe signal phase. The transition detector monitors when actual data transitions occur and generates control signals to shift the strobe timing, creating a closed-loop system that continuously optimizes synchronization accuracy despite high-frequency jitter
Solution Approach 2:
The strobe signal timing is made dynamic rather than fixed. The system continuously adjusts the strobe phase based on detected transition positions, allowing the sampling window to adapt its timing in real-time to track data transitions even as they shift due to jitter at high frequencies
2Device complexity
If the strobe signal is fixed at a standard position, then device complexity is reduced, but measurement precision deteriorates because data transitions occur at variable times due to jitter
Solution Approach 1:
The system uses the data signal itself to generate the timing information needed for sampling. The transition detector extracts timing information directly from the incoming data transitions, and this self-generated timing information is used to adjust the strobe signal, eliminating the need for external complex synchronization circuits
Data Source
AI summary
A digital data signal capture circuit for synchronization of received digital data signals includes a transition detector for determining a state transition of the received digital data signal. The transition detector samples the received digital data signal at a first time, a second time and a third time and determines whether the transition occurs between the first time and the second time and whether it occurs between the first time and third time and generates an increment/decrement signal indicating a position for the transition. A strobe adjust circuit generates a strobe signal based on the increment/decrement signal. A capture circuit captures the received digital data signal using the strobe signal.