Clock Timing Adjustment Circuit for Low-Power Duty Cycle Accuracy
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Solution Overview
Problem
Conventional duty cycle correction circuits face challenges with high power demands and limited accuracy, especially at higher frequencies, making them impractical for devices requiring lower power consumption and higher operating frequencies, such as mobile devices.
Innovation Solution
The proposed solution involves a timing adjustment circuit with signal adjustment cells and differential adjustment cells, utilizing bias-controlled inverters with variable drive strength to adjust clock signal skew, and a duty cycle correction circuit with a bias generator and leakage compensation, ensuring accurate duty cycle correction with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional duty cycle correction circuits are used, then duty cycle control is achieved, but power consumption is high and accuracy is limited at higher frequencies
Solution Approach 1:
The patent employs delay adjustment elements whose delay characteristics are modified by control signals to dynamically adjust the duty cycle. By changing the delay parameter in response to detected duty cycle deviations, the circuit achieves accurate duty cycle correction while using a simplified architecture that consumes less power compared to conventional approaches.
Solution Approach 2:
The patent implements a feedback mechanism where the duty cycle detection circuit monitors the output clock signal and generates control signals based on detected deviations. These control signals are fed back to the delay adjustment elements to automatically correct duty cycle errors, enabling high accuracy without requiring complex control logic that would increase power consumption.
2Measurement precision
If conventional duty cycle correction circuits are used, then duty cycle control is achieved, but accuracy is limited especially at higher frequencies
Solution Approach 1:
The patent uses delay adjustment elements with controllable delay characteristics that can be dynamically modified by control signals. This allows the circuit to adapt to different operating frequencies and maintain accurate duty cycle correction across a wide frequency range, overcoming the limitation of conventional circuits whose accuracy degrades at higher frequencies.
Solution Approach 2:
The patent implements a dynamic correction mechanism where the delay adjustment elements respond in real-time to duty cycle deviations detected by the feedback circuit. This dynamic adjustment capability enables the circuit to maintain high accuracy across varying operating conditions and frequencies, unlike static conventional circuits.
3Adaptability or versatility
If conventional duty cycle correction circuits are used, then duty cycle control is achieved, but the circuits are not practical for mobile devices requiring lower power and higher frequency
Solution Approach 1:
The patent divides the duty cycle correction function into distinct modular components: a duty cycle detection circuit that monitors the clock signal, delay adjustment elements that correct deviations, and control logic that coordinates their operation. This segmentation creates a practical circuit architecture suitable for mobile devices by reducing overall complexity while maintaining adaptability to low-power and high-frequency requirements.
Data Source
AI summary
Apparatuses and methods for adjusting timing of signals are described herein. An example apparatus may include a first signal adjustment cell configured to receive a first clock signal and to adjust skew of rising or falling edges of the first clock signal based on a first control signal. The timing adjustment circuit may further include a second signal adjustment cell configured to adjust skew of rising or falling edges of a second clock signal based on a second control signal. The timing adjustment circuit may further include a differential adjustment cell configured to receive the first and second clock signals and to adjust skew of rising or falling edges of the first clock signal based on the first control signal and to adjust skew of rising or falling edges of the second clock signal based on the second control signal. The first and second clock signals may be complementary.