High-Speed Duty Cycle Corrector Without VCO Bandwidth Loss
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Solution Overview
Problem
Existing data communication systems face challenges in accurately detecting signal loss and maintaining optimal duty cycle, particularly in high-data applications like social networks, where conventional methods are inadequate and inefficient.
Innovation Solution
The implementation of a duty cycle correction device that uses a pair of transistors to process input clock signals, a duty cycle sensor to generate a correction signal, and a duty cycle corrector to adjust the output clock signal, eliminating the need for a voltage-controlled oscillator (VCO) to minimize input capacitance and power consumption while maintaining clock path bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltage-controlled oscillator (VCO) is used for duty cycle correction, then duty cycle accuracy is improved, but input capacitance and power consumption increase
Solution Approach 1:
The patent extracts and removes the VCO component from the duty cycle correction system. Instead of using a VCO to generate correction signals, the invention employs a simplified circuit using transistors (such as a current mirror configuration) that directly generates correction signals from the clock signal itself, thereby eliminating the power consumption and input capacitance associated with VCO operation while maintaining duty cycle correction functionality
Solution Approach 2:
The patent replaces the expensive and complex VCO with a simple, low-cost transistor-based correction circuit. This simpler circuit uses basic transistor components rather than an oscillator, reducing both the cost and the power consumption while achieving the necessary duty cycle correction function
2Measurement precision
If a voltage-controlled oscillator (VCO) is used for duty cycle correction, then duty cycle accuracy is improved, but clock path bandwidth is degraded
Solution Approach 1:
By removing the VCO from the signal path, the patent eliminates the bandwidth limitations and phase delays introduced by the oscillator circuit. The direct transistor-based correction approach processes the clock signal without the intermediate oscillation and frequency conversion steps, preserving the original clock path bandwidth and speed characteristics while still achieving accurate duty cycle correction
3Measurement precision
If conventional duty cycle correction methods are used, then duty cycle is corrected, but device complexity increases
Solution Approach 1:
The patent extracts the essential correction function from the complex VCO-based system and implements it using a minimal transistor circuit. By removing unnecessary oscillator components and using a direct correction approach, the invention achieves duty cycle correction with significantly reduced circuit complexity
Solution Approach 2:
The correction circuit is designed to automatically generate correction signals from the input clock signal itself without requiring external control voltage inputs or complex feedback loops. The transistor-based circuit self-regulates the duty cycle based on the clock signal characteristics, eliminating the need for additional control circuitry and reducing overall system complexity
Data Source
AI summary
Embodiments of the present invention provide techniques for duty cycle correction of clock signals. An input clock signal passes through a pair of output transistors, which provides an output clock signal based on the input clock signal. A duty cycle sensor generates a first correction signal based on the output clock signal. The first correction signal is at least partially opposite of the output clock signal. A duty cycle corrector generates a second correction signal based on the first correction signal. The duty cycle corrector includes two or more transistors for generating the second correction signal. The second correction signal is applied to the output clock signal. There are other embodiments as well.