CML Frequency Divider Bias Control for Duty Cycle Stability
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Solution Overview
Problem
Frequency dividers face challenges in maintaining reliable and precise operation over varying conditions such as temperature and supply voltage, while also requiring reduced current consumption, especially in battery-powered mobile applications.
Innovation Solution
The implementation of a current mode logic (CML) frequency divider with an adjustable current source that controls the duty cycle of the output signal using a current control block, incorporating a low-pass filter and integrator to regulate the duty cycle and reduce current consumption by adjusting the current output based on the duty cycle analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current supplied to the frequency divider is increased to improve reliability and precision over varying conditions, then the accuracy and reliability of the frequency divider is improved, but the current consumption increases
Solution Approach 1:
The patent implements a dynamically adjustable current source that modifies the bias current supplied to the frequency divider based on detected output signal properties (duty cycle or frequency). This dynamic adjustment allows the system to optimize the trade-off between reliability and current consumption by adapting the current level to actual operating conditions rather than using a fixed high current level.
Solution Approach 2:
The patent employs feedback mechanisms where the output signal of the frequency divider is analyzed (through duty cycle detection or frequency measurement) and this information is used to control the current source. The feedback loop enables the system to automatically adjust the supplied current to maintain reliable operation while minimizing power consumption, resolving the contradiction between reliability and energy use.
2Reliability
If a fixed high current is used to ensure reliable operation over varying temperature and voltage conditions, then the reliability is improved, but the current consumption increases which is undesirable in battery-powered applications
Solution Approach 1:
The patent changes the operating parameters of the frequency divider by dynamically adjusting the bias current level based on actual performance needs. Instead of maintaining a fixed high current to ensure reliability across all conditions, the system monitors output signal characteristics and adjusts the current parameter accordingly, achieving reliable operation only when necessary and reducing power consumption during normal operation.
Data Source
AI summary
Various embodiments relate to frequency dividers. A current of a current source of the frequency divider is controlled based on a property of an output signal of the frequency divider.