Flash ADC Arrival-Time Interpolation for High-Resolution Conversion
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Solution Overview
Problem
Conventional flash analog-to-digital converters (ADCs) face challenges with exponential growth in circuit size, power consumption, and capacitive loading as binary resolution increases, making them unsuitable for high-speed applications, and existing solutions either reduce conversion speed or increase conversion time.
Innovation Solution
A time domain interpolation scheme for flash ADCs is introduced, utilizing arrival time comparators and a voltage divider configuration to reduce the number of voltage comparators required, allowing for faster and more accurate analog-to-digital conversion while minimizing circuit size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of voltage comparators is increased to achieve higher binary resolution, then measurement precision is improved, but device complexity and power consumption increase exponentially
Solution Approach 1:
The patent segments the comparison function across multiple time intervals rather than requiring all comparators to operate simultaneously. The single comparator performs sequential comparisons at different time slots, dividing the overall conversion process into discrete temporal segments. This reduces the number of physical comparators needed from exponential to linear with respect to resolution.
Solution Approach 2:
The patent introduces dynamic timing control where the comparator operates at different time intervals for different reference voltage levels. The conversion process uses time-domain multiplexing where each comparator output is sampled at specific time slots corresponding to different reference levels, making the system dynamically adaptive rather than statically fixed.
2Measurement precision
If the number of voltage comparators is increased to achieve higher binary resolution, then measurement precision is improved, but power consumption increases exponentially
Solution Approach 1:
The patent segments the power consumption across time intervals rather than having all comparators active simultaneously. By using a single comparator that operates sequentially at different time slots, the power consumption is divided into discrete temporal segments, reducing total power requirements compared to having all comparators active at once.
Solution Approach 2:
The patent employs periodic operation where the single comparator is activated at specific time intervals corresponding to different reference voltage levels. This periodic activation pattern reduces average power consumption compared to continuous operation of multiple comparators, as the comparator is only active during its designated time slots.
3Productivity
If conventional flash ADC architecture is used to maintain high conversion speed, then productivity is improved, but device complexity increases exponentially with resolution
Solution Approach 1:
The patent introduces dynamic timing control where the single comparator operates at different time intervals for different reference voltage levels. The conversion process uses time-domain multiplexing where each comparator output is sampled at specific time slots corresponding to different reference levels, making the system dynamically adaptive rather than statically fixed.
Solution Approach 2:
The patent introduces an intermediary timing control mechanism that coordinates the single comparator's operation across multiple time intervals. This timing intermediary manages the sequential comparison process, enabling high-resolution conversion with a single comparator by mediating between the input signal, reference voltages, and output encoding.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution enables high-speed and accurate analog-to-digital conversion with reduced circuit size and power consumption by interpolating intermediate voltage levels, making it suitable for high-speed applications without sacrificing accuracy.
Implementation Method 1
resistors 110 through 114 form a voltage divider, and a fixed voltage at a level between the reference source 102 voltage and the ground 106 voltage can exist between the second end and first end of each resistor pair
Implementation Method 2
If the reference input voltage is higher than the signal input voltage, the voltage comparator output will be set to logic low. Conversely, if the reference input voltage is lower than the signal input voltage, the voltage comparator output will be set to logic high
Data Source
AI summary
An analog-to-digital converter circuit comprises a first voltage comparator coupled to a first reference voltage and a signal voltage, the first voltage comparator having first negative and first positive outputs for outputting a comparison of the first reference voltage with the signal voltage; a second voltage comparator coupled to a second reference voltage and the signal voltage, the second reference voltage different than the first reference voltage, the second voltage comparator having second negative and second positive outputs for outputting a comparison of the second reference voltage with the signal voltage; and a first arrival time comparator coupled to the first positive output and the second negative output, the first arrival time comparator having a first arrival time comparator output for outputting a comparison of the first positive output with the second negative output.