Oscillator Frequency Correction Circuit for Continuous Clock Drift
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Solution Overview
Problem
Display driving circuits face challenges in actively responding to continuous frequency fluctuations of oscillator clock signals due to external factors, leading to image quality degradation, as conventional frequency correction methods are limited by fixed correction times.
Innovation Solution
A frequency generator with a frequency correction circuit that operates in either normal or fast mode, allowing for frequency measurement and correction during different periods, enabling quick response to frequency deviations by adjusting the oscillator clock signal without a preset interval in fast mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed correction period is used for frequency measurement, then the correction process is simple and stable, but the system cannot respond quickly to continuous frequency fluctuations
Solution Approach 1:
The frequency correction circuit dynamically switches between normal mode and fast mode based on the detected state of frequency fluctuations. When continuous fluctuations are detected, the system transitions to fast mode with a shorter measurement period, thereby adapting the correction speed to the actual operational conditions rather than using a fixed correction period
Solution Approach 2:
The system changes the measurement period parameter based on the operational mode. In normal mode, a longer measurement period is used for stable conditions, while in fast mode, a shorter measurement period is applied to respond quickly to continuous frequency fluctuations, thus optimizing the trade-off between response speed and measurement accuracy
2Measurement precision
If a longer measurement period is used, then frequency measurement accuracy is improved, but the correction time increases and responsiveness decreases
Solution Approach 1:
The measurement period is dynamically adjusted based on the operational mode. The system uses a longer measurement period in normal mode when frequency stability is maintained, ensuring high measurement accuracy. When continuous frequency fluctuations are detected, the system switches to fast mode with a shorter measurement period, reducing correction time while maintaining sufficient accuracy for the fluctuating conditions
Solution Approach 2:
The system changes the measurement period parameter from a fixed value to a variable that adapts to operational conditions. By switching between different measurement period values based on the detected frequency stability, the system optimizes both measurement precision and correction time according to the actual operational state
3Speed
If frequency correction is performed continuously without intervals, then responsiveness to frequency deviations is maximized, but power consumption and system load increase
Solution Approach 1:
The frequency correction is performed periodically based on the operational mode. In normal mode, corrections are performed at regular intervals with longer periods, reducing power consumption during stable operation. In fast mode, when continuous frequency fluctuations are detected, the correction interval is reduced to provide more frequent corrections, thereby balancing power consumption with responsiveness based on actual operational needs
Data Source
AI summary
A frequency generator and a frequency correction method for a frequency generator, which have the purpose to provide a frequency correction technology that actively responds to continuous frequency fluctuations of a clock signal through a frequency measurement period of at least two unit periods. The frequency generator comprises: an oscillator which generates an oscillator clock signal; and a frequency correction circuit which selectively operates in one of a normal mode and a fast mode, which have different correction periods according to the state of the oscillator clock signal.