Back-Bias Duty Cycle Adjustment for PVT-Stable Clock Timing
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Solution Overview
Problem
Conventional semiconductor memory devices face challenges in maintaining high data reliability and low power consumption due to process, voltage, and temperature (PVT) variations, which affect the timing margins of clock signal transitions, leading to insufficient duty cycle adjustments.
Innovation Solution
The implementation of duty cycle adjustment circuitry that uses back-bias voltage to normalize timing characteristics by applying a back-bias voltage to step generators, allowing for precise adjustments of clock signal duty cycles, thereby reducing variance caused by PVT-induced variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional duty cycle adjustment circuitry is used, then the circuit can operate with standard timing margins, but timing variations due to PVT-induced variation cannot be adequately compensated
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the duty cycle of clock signals based on detected timing variations. The system modifies the duty cycle parameter in response to PVT-induced variations, allowing the circuit to adapt and compensate for timing precision degradation, thereby maintaining data reliability under varying process, voltage, and temperature conditions.
2Speed
If clock speeds are increased to improve performance, then data transmission speed increases, but timing margins become tighter and more susceptible to variations
Solution Approach 1:
The patent implements dynamics by making the duty cycle adjustable and adaptive rather than fixed. The system dynamically modifies the duty cycle in response to detected timing variations, enabling the circuit to maintain reliable operation at high clock speeds by compensating for reduced timing margins through real-time parameter adjustment.
3Manufacturing precision
If duty cycle adjustment is implemented to compensate for PVT variation, then timing precision improves, but conventional adjustment mechanisms are insufficient for high-speed operation
Solution Approach 1:
The patent employs feedback by detecting actual timing variations in the circuit and using this information to adjust the duty cycle accordingly. This closed-loop approach enables precise timing compensation for PVT-induced variations without requiring overly complex adjustment mechanisms, as the system adapts based on real-time performance data.
Data Source
AI summary
An exemplary semiconductor device includes a clock generator circuit configured to generate a clock signal, and a duty cycle adjustment circuit configured to receive the clock signal. The duty cycle adjustment circuit includes an adjuster circuit configured to receive a back-bias voltage and to adjust a duty cycle of the clock signal based on the back-bias voltage to provide an output clock signal.