Multi-Phase Clock Synchronization for PVT-Stable Duty Ratios
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Solution Overview
Problem
Existing clock generation circuits that generate multi-phase clock signals face challenges in maintaining consistent duty ratios and transition times due to variations in Process, Voltage, and Temperature (PVT).
Innovation Solution
The proposed solution involves a clock generation circuit with a control clock generation circuit, first and second clock synchronization circuits, which compare reference voltages with feedback clock signals to generate control clock signals. These control clock signals synchronize the feedback clock signals, allowing the generation of phase clock signals that are synchronized with the transitions of the feedback clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a ring oscillator including a plurality of inverting gates is used to generate multi-phase clock signals, then the clock generation circuit can be implemented with a relatively simple structure, but the duty ratios and transition time points of the clock signals cannot be guaranteed due to PVT variations
Solution Approach 1:
The patent introduces feedback mechanisms where clock signals are fed back to control logic circuits that adjust the operation of inverting gates. The control logic receives feedback about the actual clock signal characteristics and dynamically adjusts gate operation to maintain consistent duty ratios and transition times despite PVT variations, resolving the contradiction between simple structure and reliable performance.
Solution Approach 2:
The patent employs parameter changes by adjusting the operating parameters of the inverting gates (such as threshold voltages, bias currents, or gate dimensions) based on detected clock signal characteristics. This allows the circuit to adapt to PVT variations and maintain consistent duty ratios without fundamentally changing the overall ring oscillator structure.
2Device complexity
If a ring oscillator including a plurality of inverting gates is used to generate multi-phase clock signals, then the clock generation circuit can be implemented with a relatively simple structure, but the transition time points of the clock signals cannot be guaranteed due to PVT variations
Solution Approach 1:
The patent uses feedback loops where transition time information is monitored and fed back to control elements that adjust the timing of signal transitions in the ring oscillator. This feedback mechanism ensures that transition time points remain consistent across PVT variations while preserving the simplicity of the ring oscillator architecture.
Solution Approach 2:
The patent implements preliminary action by pre-adjusting the parameters of inverting gates or inserting calibration circuits that proactively compensate for expected PVT variations before they affect the clock signal transitions. This preemptive adjustment maintains transition time consistency without requiring complex real-time correction mechanisms.
Data Source
AI summary
A clock generation circuit includes a control clock generation circuit and first and second clock synchronization circuits. The control clock generation circuit compares a reference voltage with first and second feedback clock signals to generate first and second control clock signals. The first clock synchronization circuit makes the first and second feedback clock signals transit in synchronization with the first and second control clock signals. The second clock synchronization circuit generates first and second phase clock signals in synchronization with the first feedback clock signal and the second feedback clock signal.