Duty Ratio Correction Circuit With Mode-Dependent Sensing Speed
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Solution Overview
Problem
Existing duty correction circuits have a uniform duty ratio sensing speed across all modes, including normal, power-up, and self-refresh modes, which can lead to increased jitter and instability when high speed correction is required in specific modes like power-up or self-refresh.
Innovation Solution
A duty correction circuit that dynamically controls the duty ratio sensing speed through a sensing speed control signal, allowing for increased or decreased sensing speed as needed, by adjusting the current flow or capacitance of the duty ratio sensor, thereby enabling faster correction in modes like power-up or self-refresh without affecting normal mode performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the duty ratio sensing speed is increased in all modes, then the correction speed is improved, but jitter and instability increase in normal mode
Solution Approach 1:
The patent applies dynamics by making the duty ratio sensing speed adjustable rather than fixed. The sensing speed control signal dynamically changes the sensing speed based on the operating mode: higher speed during power-up/self-refresh modes and normal speed during normal mode. This resolves the contradiction by allowing the system to adapt its performance characteristics to different operational requirements.
Solution Approach 2:
The patent changes the sensing speed parameter based on the operating mode. By controlling the sensing speed through a control signal that adjusts the charging/discharging current of capacitors in the duty ratio sensor, the system can optimize correction speed when needed while maintaining stability during normal operation. This parameter adjustment resolves the contradiction between speed and stability.
2Device complexity
If the duty ratio sensing speed is uniform across all modes, then device complexity is reduced, but the system cannot meet high-speed correction requirements in specific modes
Solution Approach 1:
The patent makes the duty ratio sensor multi-functional by enabling it to operate at different sensing speeds within the same hardware structure. The sensor can function in both normal speed mode (for stability) and high speed mode (for quick correction during power-up or self-refresh), eliminating the need for separate circuits for different modes while meeting diverse performance requirements.
Solution Approach 2:
The patent introduces dynamic control capability to a previously static sensing system. By adding a sensing speed control signal that adjusts the operating parameters based on mode requirements, the system gains the flexibility to optimize correction speed when needed without increasing fundamental circuit complexity. The same hardware adapts its behavior dynamically.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This dynamic control of duty ratio sensing speed stabilizes system performance, reduces instability, and minimizes jitter by increasing sensing speed in specific modes while maintaining normal mode stability.
Implementation Method 1
The first and second charge storing units 107 and 109 are connected to an output end of the duty ratio sensor 101 and charged or discharged thereby. The first and second charge storing units 107 and 109 control a logical level transition speed of the first and second correction signals A and B.
Data Source
AI summary
A duty correction circuit includes a duty ratio sensor for controlling a duty ratio sensing speed by a sensing speed control signal and outputting a correction signal by sensing a duty ratio of a clock, and a duty ratio corrector for controlling the duty ratio of the clock in response to the correction signal.