Duty Cycle Correction Circuit With Sawtooth Feedback Clock Balancing
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Solution Overview
Problem
Conventional frequency doubling circuits in high-speed integrated circuits fail to correct the duty cycle of clock signals, leading to instability and inefficiency in frequency doubling operations.
Innovation Solution
A duty cycle correction circuit comprising a sawtooth wave generating unit, a voltage regulating unit, a differential comparator, a differential amplifier, and low-pass filters, which converts a narrow pulse signal into a sawtooth wave with a 50% duty cycle, compares voltage differences, and adjusts voltage levels to stabilize the output clock signal at 50%, ensuring precise frequency doubling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional frequency doubling circuits are used, then frequency doubling can be achieved, but the duty cycle of the clock signal cannot be corrected, leading to instability and imprecision
Solution Approach 1:
The patent implements a feedback mechanism where the output clock signal is fed back to the duty cycle correction circuit, which compares the actual duty cycle with the target 50% duty cycle and adjusts the clock signal accordingly. This closed-loop feedback ensures both stable and precise frequency doubling by continuously correcting duty cycle deviations.
Solution Approach 2:
The patent replaces conventional mechanical or simple electronic frequency doubling methods with a sophisticated duty cycle correction circuit that uses differential comparators, voltage controlled oscillators, and feedback loops. This substitution enables precise duty cycle control and stable frequency doubling that conventional circuits cannot achieve.
2Measurement precision
If duty cycle correction is added to frequency doubling circuits, then precision and stability improve, but circuit complexity increases
Solution Approach 1:
The patent merges the frequency doubling function and duty cycle correction function into a single integrated circuit architecture. The duty cycle correction circuit is seamlessly combined with the frequency doubling stages, allowing both functions to work together without requiring separate independent circuits, thus reducing overall system complexity while maintaining precision.
Solution Approach 2:
The duty cycle correction circuit is designed to be universal and can be applied to multiple frequency doubling stages within the same circuit. The correction mechanism serves multiple purposes: it corrects duty cycle deviations, stabilizes oscillation frequencies, and ensures precise frequency doubling, making it a multi-functional component that justifies its inclusion despite increased complexity.
Data Source
AI summary
A duty cycle correction circuit includes a sawtooth wave generating unit, a voltage regulating unit, a differential comparator, a differential amplifier and low-pass filters. The sawtooth wave generating unit converts a narrow pulse signal into a sawtooth wave signal with a duty cycle of 50% which is input into the differential comparator. The voltage regulating unit regulates an input voltage value of a non-inverting input terminal of the differential comparator. The differential comparator compares a voltage difference between input signals of input terminals and outputs an output clock signal. The low-pass filters input DC components to the differential amplifier which amplifies the DC signals and output to the voltage regulating unit. The duty cycle correction circuit has a small chip occupying area to realize high integration of the chip, and the duty cycle of the output clock is accurately corrected to ensure the stability of the output clock frequency.