Tunable Delay Circuit Control for PVT Variation Compensation
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Solution Overview
Problem
Conventional delay circuits are affected by process, voltage, and temperature (PVT) variations, leading to inconsistent delay times across different locations, which compromises the performance of related circuits, such as memory devices, by requiring longer delay settings and resulting in low data output efficiency.
Innovation Solution
A delay control device and tunable delay device that couple an oscillator and counter to an external clock signal, allowing for the generation of an internal clock signal and selective resetting of the counter, enabling the adjustment of delay times based on a delay indication signal to compensate for PVT variations and optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional delay circuit is used, then the delay time can be generated, but the delay time varies significantly due to PVT variations and location differences
Solution Approach 1:
An external clock signal is introduced as an intermediary reference that both the oscillator and counter use. This external clock serves as a stable mediator that decouples the delay generation from PVT variations, allowing consistent delay timing across different locations and conditions while maintaining the required delay functionality.
2Reliability
If the delay time specification is set longer to accommodate variations, then consistency across different locations is improved, but data output efficiency decreases
Solution Approach 1:
The delay time parameter is made dynamically adjustable through the counter mechanism. By changing the counter reset timing based on actual circuit conditions and location, the delay can be optimized for each specific application rather than using a conservative fixed value, thus maintaining consistency while improving efficiency.
3Adaptability or versatility
If distributed oscillators are used, then delay times can be generated at different locations, but PVT variations still affect the delay time accuracy
Solution Approach 1:
The counter mechanism provides feedback control for delay adjustment. By monitoring the actual delay performance and adjusting the counter reset timing accordingly, the system can compensate for PVT variations and maintain precise delay timing across different locations and conditions.
Solution Approach 2:
The external clock signal serves as a stable intermediary reference that decouples the delay generation from PVT variations. This external reference ensures that both the oscillator and counter operate from a common stable timing source, maintaining precision across different locations.
Data Source
AI summary
A delay control device for controlling a delay circuit includes an oscillator, a counter, and an output control circuit. The oscillator generates an internal clock signal according to an external clock signal. The counter generates an accumulative signal according to the internal clock signal. The counter is selectively reset by the external clock signal. The output control circuit generates a delay indication signal according to the accumulative signal. The delay time of the delay circuit is adjusted according to the delay indication signal.