Flash ADC Comparator Architecture for Extreme Bias Conditions
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Solution Overview
Problem
Current flash analog to digital converters with uniform comparator circuit architectures face operation failures due to extreme bias conditions and high input signal swings, leading to systematic and random mismatches that cause certain comparator circuits to malfunction.
Innovation Solution
The implementation of a flash analog to digital converter with double differential amplifier circuits having different circuit architectures, where the reference voltage differences and bias conditions are varied to ensure stable operation under extreme conditions, preventing operation failures by maintaining gain and bandwidth within a predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all comparator circuits use the same circuit architecture, then device complexity is reduced and manufacturing is simplified, but reliability deteriorates under extreme bias conditions and high input signal swings
Solution Approach 1:
The patent applies local quality by assigning different circuit architectures to different comparator circuits based on their specific operating conditions. Comparators handling extreme bias conditions or high swing signals use architectures optimized for those conditions, while others use standard architectures. This localized differentiation resolves the contradiction by maintaining simplicity where possible while ensuring reliability where needed.
Solution Approach 2:
The patent changes architectural parameters of comparator circuits selectively. By modifying circuit topology parameters (such as using different amplifier configurations or biasing schemes) for specific comparators facing extreme conditions, the system maintains overall simplicity while achieving local optimization for reliability under stress conditions.
2Reliability
If comparator circuits are designed for extreme bias conditions, then reliability under extreme conditions improves, but device complexity increases
Solution Approach 1:
Complex architectures are applied locally only to comparators that actually encounter extreme bias conditions or high swing signals, rather than uniformly across all comparators. This resolves the contradiction by concentrating complexity only where it provides reliability benefits.
Solution Approach 2:
The comparator array is segmented into different groups based on their operating conditions. Some comparators use simplified architectures while others use enhanced architectures optimized for extreme conditions. This segmentation allows the system to achieve high reliability under extreme conditions without unnecessarily complicating the entire device.
Data Source
AI summary
A flash analog to digital converter includes a voltage generator circuit, an encoder circuit, and first and second double differential amplifier circuits. The voltage generator circuit generates reference voltages according to first and second voltages. The encoder circuit generates a digital signal corresponding to an input signal according to first signals. The first double differential amplifier circuit compares the input signal with a first reference voltage in the reference voltages, to generate a corresponding one of the first signals. The second double differential amplifier circuit compares the input signal with a second reference voltage in the reference voltages, to generate a corresponding one of the first signals. A difference between the first voltage and the first reference voltage is less than that between the first voltage and the second reference voltage, and the first and the second double differential amplifier circuits have different circuit architectures.