Jitter Suppression Circuit Using Digital Counter for Signal Wiring
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Solution Overview
Problem
Existing jitter suppression circuits in signal wiring systems require large chip sizes due to analog circuit components like capacitors and amplifiers, which also limit the frequency range and increase circuit scale, making it difficult to maintain a small component surface area and effectively suppress jitter, especially in low frequency ranges.
Innovation Solution
A signal wiring system with a jitter suppression circuit that uses a differential amplifier circuit and feedback resistors to reduce jitter in differential signals without requiring analog filters, allowing for a smaller chip size and effective suppression across various frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog circuit components (capacitors and resistors) are used to configure a band-pass filter for jitter suppression, then jitter can be removed from the clock signal, but the chip size increases and the frequency band is narrowed
Solution Approach 1:
The patent replaces the mechanical/analog filter system (capacitors and resistors forming a band-pass filter) with a digital signal processing approach using a counter and clock signal processing circuit. This substitution eliminates the need for physical capacitor components that consume chip area, while maintaining jitter suppression functionality through digital means.
Solution Approach 2:
The patent changes the operating parameters by using digital signal processing instead of analog filtering. The counter-based approach allows for programmable frequency selection and jitter suppression across a wider frequency range without being constrained by the physical limitations of analog components, thereby reducing chip area while maintaining or improving performance.
2Reliability
If analog circuit components are used for jitter suppression, then jitter can be removed, but the frequency range is narrowed and low frequency jitter suppression is ineffective
Solution Approach 1:
The patent replaces the analog band-pass filter with a digital counter-based jitter suppression mechanism that can operate across a broader frequency spectrum. The digital approach allows for flexible frequency handling including low frequencies, overcoming the inherent limitations of analog filters in this range.
Solution Approach 2:
The patent creates a universal jitter suppression circuit that can handle multiple frequency ranges effectively. The counter-based design provides multi-functionality by being capable of suppressing jitter at both high and low frequencies, unlike analog filters that are frequency-specific and require multiple components to cover wide bands.
3Reliability
If variable amplifiers and differential amplifiers are used to extract and correct jitter, then jitter can be suppressed, but the circuit scale size increases
Solution Approach 1:
The patent replaces complex analog amplifier chains with a simplified digital counter-based system. Instead of using multiple analog components (variable amplifiers, differential amplifiers, filters), the invention uses a counter and basic clock signal processing to achieve the same jitter suppression effect with significantly reduced circuit complexity and smaller scale.
Data Source
AI summary
Reducing jitter in signal wiring without requiring a larger circuit scale is difficult in the technology of the related art. A signal wiring system to resolve the above problem therefore includes an output unit to output a differential signal, a receiver unit to receive differential signals from the output unit, a jitter suppression circuit to suppress the amount of the jitter in the differential signal received by the receiver unit according to a suppression coefficient, and a signal wiring unit for conveying a differential signal from the output unit and including a wiring length set according to a suppression coefficient in the jitter suppression circuit.