Semiconductor Test Circuit for Internal Wire Delay Measurement
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Solution Overview
Problem
Semiconductor memory devices face issues with data reliability due to timing variances caused by process, voltage, and temperature differences, leading to unstable data transmission and reduced timing margins, especially in high-speed applications.
Innovation Solution
Incorporating a test circuit to measure and compensate for signal propagation delays within the semiconductor device, allowing for the adjustment of internal delays based on detected delays, thereby ensuring reliable data transmission by configuring a delay parameter that is persistently stored in a programmable circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal propagation delay is not compensated, then device complexity remains low, but data reliability deteriorates due to timing variance
Solution Approach 1:
The semiconductor device performs self-diagnosis by including a test circuit that automatically measures signal propagation delays within the device and generates delay compensation values without requiring external testing equipment, thereby improving data reliability while minimizing additional complexity
Solution Approach 2:
The device implements a feedback mechanism where the test circuit continuously monitors internal signal propagation delays and adjusts timing parameters based on measured values, ensuring data reliability through automatic compensation for PVT-induced timing variations
2Measurement precision
If internal delay measurement is implemented, then timing precision is improved, but device complexity increases due to additional test circuitry
Solution Approach 1:
The test circuit is integrated within the semiconductor device itself, allowing it to autonomously measure its own internal signal propagation delays through self-diagnosis functionality, achieving high timing precision without requiring complex external testing infrastructure
Solution Approach 2:
The test circuit functionality is merged with the existing semiconductor device structure, combining measurement, testing, and compensation functions into a unified integrated system that achieves precise timing measurement while minimizing additional complexity through shared resources
3Stability of the object's composition
If delay compensation is applied, then data stability is improved, but manufacturing complexity increases due to programmable circuit requirements
Solution Approach 1:
The device compensates for timing variations by dynamically adjusting delay parameters based on measured signal propagation characteristics, using programmable delay circuits that can be configured with compensation values generated during manufacturing or operation to maintain data stability across PVT conditions
Solution Approach 2:
Delay compensation values are determined and stored in programmable circuits during the manufacturing process through self-diagnosis testing, performing the compensation configuration in advance before the device enters production, thereby simplifying manufacturing by pre-configuring timing parameters rather than requiring complex real-time adjustments
Data Source
AI summary
Semiconductor devices that include test circuitry to measure internal signal wire propagation delays during memory access operations, and circuity configured to store delay information that is used to configure internal delays based on the measured internal signal propagation circuit delays. The semiconductor device includes a test circuit configured to measure a signal propagation delay between a command decoder and a bank logic circuit based on time between receipt of a test command signal directly from the command decoder and a time of receipt of the test command signal routed through the bank logic circuit.