Clock Phase Control Circuit for Wide-Range Frequency Stability
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Solution Overview
Problem
Semiconductor circuits face challenges in stably controlling the phase and frequency of clock signals across a wide frequency range, which is crucial for system operation but not adequately addressed by existing technologies.
Innovation Solution
A phase and frequency control circuit is designed, comprising a division circuit to generate divided signals, a timing control circuit to sample these signals based on a phase control code and sampling reference signal, and a multiplexing circuit to output a phase and frequency control signal with desired phase and frequency, using a combination of dividers and flip-flops to achieve precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional clock signal control methods are used, then the circuit operation is simple, but the phase and frequency control stability across wide frequency range is insufficient
Solution Approach 1:
The phase and frequency control circuit is divided into multiple independent functional modules: a division circuit that generates divided clock signals, a timing control circuit that samples these divided signals, and an output circuit that generates the final controlled clock signal. This segmentation allows each module to perform its specific function with high precision, thereby achieving stable phase and frequency control across a wide frequency range without requiring an overly complex monolithic structure.
Solution Approach 2:
The circuit employs dynamic control mechanisms where the timing control circuit samples divided clock signals at different phases determined by a phase control code, and the output circuit dynamically selects and combines these sampled signals based on frequency control requirements. This dynamic adaptability enables the circuit to maintain stable phase and frequency control across varying operating conditions and wide frequency ranges.
2Adaptability or versatility
If the frequency range is extended, then the adaptability of the system is improved, but the control precision of phase and frequency deteriorates
Solution Approach 1:
The division circuit generates multiple divided clock signals with different frequencies by dividing the input clock signal by different division ratios. The timing control circuit then samples these divided signals at different phases. This segmentation of frequency ranges into multiple divided signals allows the system to cover a wide frequency range while maintaining precise phase and frequency control within each segment.
Solution Approach 2:
The circuit changes key parameters including division ratios, sampling phases, and control codes to adapt to different frequency ranges. By dynamically adjusting these parameters, the circuit maintains precise phase and frequency control across the entire wide frequency range, resolving the contradiction between extended frequency coverage and control precision.
3Measurement precision
If multiple divided signals are generated for precise control, then the phase and frequency control precision is improved, but the device complexity increases
Solution Approach 1:
The timing control circuit is designed to perform multiple functions: it samples divided clock signals, determines optimal sampling phases based on phase control codes, and generates timing control signals for the output circuit. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby achieving precise phase and frequency control without proportionally increasing device complexity.
Solution Approach 2:
The output circuit merges multiple sampled clock signals from different division circuits into a single controlled output signal. By combining these signals through selective gating and phase adjustment, the circuit achieves precise phase and frequency control while using a unified output structure rather than multiple independent output paths, thus limiting the increase in device complexity.
Data Source
AI summary
A phase and frequency control circuit may be provided. The phase and frequency control circuit may include a division circuit configured to generate a plurality of divided signals by dividing an input signal. The phase and frequency control circuit may include a timing control circuit configured to generate a plurality of timing control signals by sampling the plurality of divided signals according to a phase control code and a sampling reference signal.