Digital Clock Duty Cycle Control Using Noisy Sampling
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Solution Overview
Problem
High-speed data communication protocols face challenges in controlling duty cycle distortion of clock signals, particularly in half-rate data transmission systems which are more susceptible to distortion and require efficient mechanisms to maintain data integrity and reduce power consumption.
Innovation Solution
The implementation of a method that uses a sampling clock signal with random noise distribution to sample high and low voltage duty cycles of an input clock signal, generating a digital control signal to adjust the duty cycles and maintain distortion within specified limits, employing digital signal processing and mixed signal processing techniques to control duty cycles of both the input and inverse clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a half rate data transmission system is used to reduce power consumption, then power consumption is reduced, but the system becomes more susceptible to duty cycle distortion
Solution Approach 1:
The patent implements a feedback mechanism where the duty cycle distortion detection circuit continuously monitors the clock signal's duty cycle distortion and generates control signals to adjust the clock signal accordingly. This closed-loop feedback system dynamically compensates for distortion, enabling the half rate transmission system to maintain reliability while operating at lower power consumption levels.
Solution Approach 2:
The patent replaces traditional analog duty cycle correction mechanisms with digital signal processing techniques. The duty cycle distortion detection circuit uses digital logic circuits and algorithms to detect and correct distortion, substituting mechanical or analog adjustment mechanisms with programmable digital solutions that offer more precise control and lower power consumption.
2Reliability
If duty cycle distortion is controlled within tight limits for high fidelity data transmission, then data integrity is improved, but system complexity increases
Solution Approach 1:
The patent segments the duty cycle control function into distinct modular components: a duty cycle distortion detection circuit that separates the distortion measurement function from the clock signal generation, and a control circuit that independently processes correction signals. This segmentation allows each module to be optimized independently and simplifies the overall system architecture while maintaining tight distortion control.
Solution Approach 2:
The patent introduces an intermediary duty cycle distortion detection circuit that acts as a mediator between the clock signal source and the data transmission system. This intermediary component buffers and conditions the clock signal, providing a stable reference while isolating the main transmission system from direct control complexity. The detection circuit translates complex distortion measurements into simplified control signals.
Data Source
AI summary
A method controls duty cycle distortion of clock signals. An electronic device obtains an input clock signal having a first frequency and a sampling clock signal having a second frequency that is lower than the first frequency. The sampling clock signal has a random noise distribution. The sampling clock signal is applied to sample high voltage duty cycles and low voltage duty cycles of the input clock signal for a duration of time to obtain a sampling result. The electronic device determines a duty cycle distortion level of the input clock signal in the duration of time based on the sampling result. A duty cycle control signal is generated based on the duty cycle distortion level to control the high voltage duty cycles of the input clock signal.