TI-ADC Clock Calibration for Timing Skew Reduction
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Solution Overview
Problem
High-speed data transfer in semiconductor circuits is hindered by timing skew issues, which cause mismatches in sampling intervals across channels, leading to degraded signal quality and reduced SNDR.
Innovation Solution
A semiconductor circuit with a TI-ADC circuit and skew calibration circuits that use moving average calculations to adjust sampling clocks, reducing timing skew by calibrating the sampling intervals across multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple channels sample at different timings, then parallel processing capability is improved, but timing skew causes signal quality degradation
Solution Approach 1:
The patent implements a feedback mechanism where the processor calculates timing skew between channels, generates calibration signals with adjusted timings, and feeds these back to the sampling circuits. This closed-loop feedback system continuously corrects timing differences, allowing multi-channel parallel processing to maintain synchronized sampling and prevent signal quality degradation.
Solution Approach 2:
The patent dynamically changes the sampling timing parameters of different channels based on calculated skew values. By adjusting the sampling timing of individual channels relative to a reference channel, the system compensates for timing differences while maintaining parallel operation, thus resolving the contradiction between productivity and signal quality.
2Adaptability or versatility
If sampling intervals are not aligned across channels, then channel independence is improved, but spurious components increase
Solution Approach 1:
The patent performs preliminary timing calibration before actual signal processing. The processor calculates timing skew between channels in advance, generates calibration signals with pre-adjusted timings, and applies these corrections before the main sampling operation. This preliminary action ensures that channels operate independently yet synchronously, preventing spurious components while maintaining channel independence.
3Speed
If high-speed data transfer is implemented, then transfer rate is improved, but timing skew issues worsen
Solution Approach 1:
The patent implements dynamic timing adjustment where sampling clocks are continuously calibrated based on real-time skew measurements. The system adapts sampling timings dynamically during operation, allowing high-speed data transfer while maintaining timing accuracy through active compensation mechanisms that adjust to changing conditions.
Solution Approach 2:
The patent uses feedback control where timing skew is continuously measured, processed, and corrected through calibrated signals. This feedback loop enables the system to maintain reliable timing accuracy even at high transfer rates by automatically compensating for timing drift and skew that occur at higher speeds.
Data Source
AI summary
According to the one embodiment, a semiconductor circuit includes: an analog-to-digital conversion circuit including a first analog-to-digital converter configured to sample at least one first sampling signal regarding an input signal based on a first clock, and a second analog-to-digital converter configured to sample at least one second sampling signal regarding the input signal based on a second clock shifted from the first clock by a first time; and a first calibration circuit configured to calibrate at least one timing of the first clock and the second clock based on a calculation result of a moving average of the first sampling signal and the second sampling signal.