On-Chip Waveform Measurement for Distortion-Free Signal Timing
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Solution Overview
Problem
Existing methods for measuring transition times of digital signals in integrated circuits face challenges due to external measurement distortions and require complex hardware, making on-chip waveform analysis necessary for reliable signal timing and slew rate monitoring.
Innovation Solution
A circuit comprising a window detector and a time-difference-to-digital converter, which compares digital signals with reference voltages and converts time differences into digital values, allowing for precise measurement of transition times without external equipment, reducing hardware complexity by 60%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external measurement equipment is used to measure signal waveforms, then measurement can be performed, but signal distortion occurs and measurement reliability deteriorates
Solution Approach 1:
The measurement function is extracted from external equipment and integrated directly into the chip's internal circuitry. The waveform measurement circuit is embedded within the integrated circuit itself, allowing signals to be measured without leaving the chip, thereby eliminating external equipment-induced signal distortion and improving measurement reliability.
Solution Approach 2:
An on-chip waveform measurement circuit serves as an intermediary between the digital signal and the measurement process. This intermediate measurement circuit captures signal characteristics internally through dedicated comparators and timing circuits, preventing direct interaction with external equipment that would cause distortion while still enabling accurate measurement.
2Measurement precision
If traditional waveform measurement circuits are implemented, then signal timing can be monitored, but hardware complexity increases significantly
Solution Approach 1:
The waveform measurement function is segmented into distinct modular components: edge detection circuits for rising/falling edges, delay measurement circuits for timing intervals, and skew measurement circuits for signal alignment. Each module performs a specific measurement task independently, achieving comprehensive waveform analysis through simple, dedicated circuit blocks rather than complex integrated systems.
Solution Approach 2:
The measurement approach changes from continuous analog waveform capture to discrete parameter sampling. Instead of measuring complete waveforms, the circuit measures specific parameters (edge timing, delay intervals, skew values) at critical points, converting complex continuous signal analysis into simple discrete time interval measurements that require minimal hardware.
Data Source
AI summary
A circuit for measuring a transition time of a digital signal may be provided. The circuit comprises a window detector comprising a comparator circuitry arranged for generating a first signal based on comparing said digital signal with a first reference voltage and for generating a second signal based on comparing said digital signal with a second reference voltage. Additionally, the circuit comprises a time-difference-to-digital converter operable for converting a delay between an edge of said first signal and an edge of said second signal into a digital value, said digital value characterizing said transition time of said digital signal.