Eye Pattern Generator Using Shared-Clock Comparator Voltage Control
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Solution Overview
Problem
Traditional eye pattern generators face instability and reduced accuracy due to the need for synchronization circuits to unify comparison results from comparators operating on different clock signals, leading to insufficient timing margin.
Innovation Solution
An eye pattern generator design that uses a control circuit to adjust the voltage levels of comparators operating on the same clock signal, eliminating the need for synchronization by shifting the clock signal and adjusting voltages to define the boundary between open-eye and closed-eye regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If comparators operate based on different clock signals to perform sampling and comparison operations, then the eye pattern generation can be achieved, but a synchronization circuit is required which reduces timing margin and stability
Solution Approach 1:
Multiple comparators are made to operate based on the same clock signal instead of different clock signals, merging their timing reference into a single unified clock source. This eliminates the need for synchronization circuits while maintaining the ability to perform multiple sampling and comparison operations for eye pattern generation.
Solution Approach 2:
The invention dynamically adjusts the voltage levels of the comparators to compensate for operating on the same clock signal. By changing voltage levels dynamically, the system maintains accurate eye pattern measurement while using a unified clock source, thus avoiding synchronization requirements.
2Measurement precision
If a synchronization circuit is used to synchronize comparison results from different comparators, then timing alignment is achieved, but the timing margin becomes insufficient and accuracy reduces
Solution Approach 1:
All comparators operate synchronously on the same clock signal, merging their timing references to eliminate the need for post-comparison synchronization. This direct synchronous operation preserves maximum timing margin while maintaining measurement accuracy through unified timing.
Solution Approach 2:
The invention changes the voltage level parameter of the comparators to optimize performance when operating on the same clock signal. By adjusting voltage levels, the system achieves accurate eye pattern measurement without the timing losses associated with synchronization circuits.
3Productivity
If multiple comparators operate on different clock signals, then sampling operations can be performed independently, but the device complexity increases due to synchronization requirements
Solution Approach 1:
The invention merges the clock signals of multiple comparators into a single shared clock source, allowing independent sampling operations to proceed simultaneously without requiring complex synchronization circuits to coordinate their results.
Data Source
AI summary
An eye pattern generator for generating an eye pattern of an input signal is provided. The eye pattern generator includes first and second comparators and a control circuit. The first comparator receives the input signal, a clock signal, and a first voltage and compares the input signal with the first voltage according to the clock signal to generate a first comparison signal. The second comparator receives the input signal, the clock signal, and a second voltage lower than the first voltage and compares the input signal with the second voltage according to the clock signal to generate a second comparison signal. The control circuit changes at least one of a level of the first voltage and a level of the second voltage according to the first and second comparison signals to form a region boundary between an open-eye region and a closed-eye region of the eye pattern.