Latency Control Circuit for PVT-Induced Clock Phase Compensation
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Solution Overview
Problem
Existing latency control circuits in semiconductor devices face failures due to phase differences between external and internal clocks caused by variations in process, voltage, and temperature (PVT) conditions, leading to incorrect timing of signal operations.
Innovation Solution
A latency control circuit that includes a phase detection unit to generate phase information, a delay amount deciding unit to calculate the latency delay based on path and phase information, and a latency delay unit to synchronize the input signal with the internal clock, ensuring accurate latency signal generation regardless of PVT variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a delay locked loop is used to synchronize clocks, then clock synchronization is achieved, but phase differences still occur due to PVT variations causing timing failures
Solution Approach 1:
The patent applies preliminary action by measuring the phase difference between external and internal clocks in advance (before signal processing) and pre-calculating the compensation value. This phase difference measurement and compensation value calculation are performed beforehand so that when signals need to be processed, the timing relationship is already known and compensated, preventing timing failures due to PVT variations.
Solution Approach 2:
The patent implements feedback by continuously monitoring the phase difference between external and internal clocks and using this information to adjust the timing of signal processing operations. The phase difference measurement feeds back into the system to determine appropriate timing adjustments, creating a closed-loop control mechanism that maintains accurate timing despite PVT variations.
2Measurement precision
If latency delay is calculated without phase information, then calculation simplicity is maintained, but timing accuracy deteriorates under PVT variations
Solution Approach 1:
The patent applies preliminary action by pre-calculating the phase difference between external and internal clocks and storing this compensation value for later use. This phase difference information is measured and prepared in advance, so when latency delay calculation is needed, the accurate timing can be achieved by incorporating this pre-computed phase information without requiring complex real-time calculations.
3Reliability
If signal timing is not compensated for phase difference, then operation speed is maintained, but timing accuracy and reliability decrease
Solution Approach 1:
The patent introduces an intermediary mechanism - a phase difference measurement and compensation system - that mediates between the external clock and internal signal processing. This intermediary measures the phase difference and provides compensation information that allows signals to be timed accurately without requiring excessive delay, thus maintaining both reliability and reasonable operation speed.
Data Source
AI summary
A latency control circuit of a semiconductor device includes a phase detection unit configured to generate phase information regarding a phase difference between an external clock and an internal clock, a delay amount deciding unit configured to decide a latency delay amount based on path information of an input signal, a latency value of the input signal, and the phase information, and a latency delay unit configured to generate a latency signal by delaying the input signal according to the latency delay amount and the phase information to produce a delayed input signal and by synchronizing the delayed input signal with the internal clock.