Oscillator Clock Duty Adjustment for Accurate Multi-Output Timing
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Solution Overview
Problem
Existing circuit devices face challenges in achieving high-accuracy duty adjustment of clock signals, particularly when implementing a multi-output function, due to difficulties in adjusting the duty ratio while maintaining precision across various manufacturing process fluctuations and transistor variations.
Innovation Solution
The circuit device incorporates an oscillation circuit, a waveform shaping circuit, a first duty adjustment circuit, and an output buffer circuit with a second duty adjustment circuit, which collectively adjust the duty ratio of clock signals through variable bias voltage adjustments and phase inversion, ensuring high-accuracy duty adjustment and multi-output functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple duty adjustment method is used, then device complexity is reduced, but manufacturing precision of duty ratio deteriorates
Solution Approach 1:
The duty adjustment function is segmented into two independent circuits: a first duty adjustment circuit for coarse adjustment and a second duty adjustment circuit for fine adjustment. This segmentation allows each circuit to be optimized for its specific adjustment range, achieving high precision without excessive overall complexity.
Solution Approach 2:
The patent employs dynamic adjustment capabilities where the first and second duty adjustment circuits can be independently controlled to provide both coarse and fine adjustment ranges. This dynamic segmentation of adjustment functions enables precise duty ratio control while maintaining reasonable circuit complexity.
2Device complexity
If a single duty adjustment circuit is used, then device complexity is reduced, but adaptability to multi-output requirements deteriorates
Solution Approach 1:
The first and second duty adjustment circuits are designed to work together to provide universal duty adjustment capability for multiple output clock signals. The circuits can independently adjust duty ratios of different output signals, making the system adaptable to various multi-output requirements while maintaining manageable complexity.
3Manufacturing precision
If high-accuracy duty adjustment is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The high-precision duty adjustment is achieved through segmentation into two circuits with different adjustment ranges. The first circuit handles coarse adjustment (0-100% duty ratio range) while the second circuit provides fine adjustment, dividing the precision requirement into manageable segments that reduce overall circuit complexity.
Solution Approach 2:
The first duty adjustment circuit provides adjustment capability that may be more than sufficient for some applications (0-100% range), while the second circuit provides additional fine adjustment precision. This partial overlap of adjustment ranges ensures high precision is achieved without requiring every component to be optimally complex.
Data Source
AI summary
A circuit device includes an oscillation circuit configured to oscillate a resonator to thereby generate an oscillation signal, a waveform shaping circuit to which the oscillation signal is input, and which is configured to output a clock signal obtained by performing waveform shaping on the oscillation signal, a first duty adjustment circuit configured to perform a duty adjustment of the clock signal, and an output buffer circuit configured to output a first output clock signal and a second output clock signal to an outside based on the clock signal. The output buffer circuit includes a second duty adjustment circuit configured to perform a duty adjustment of the second output clock signal.