Dual-Resolution ADC Circuit for Selective High-Precision Conversion
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Solution Overview
Problem
Existing analog-to-digital converter systems consume excessive power and resources by continuously converting analog signals at high resolution, even when there are no significant changes, leading to inefficient bandwidth usage and increased circuitry.
Innovation Solution
Implementing a dual-resolution ADC system where a lower resolution ADC monitors analog signals and only triggers a higher resolution ADC for conversion when a change is detected, thereby reducing power consumption and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a higher resolution ADC is used for continuous conversion, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The system dynamically switches between lower resolution and higher resolution ADC modes based on signal change detection. When the signal is stable, the lower resolution mode is used to save power. When a change is detected, the higher resolution mode is activated temporarily to capture the transition accurately, then returns to low-power mode.
Solution Approach 2:
The lower resolution ADC periodically monitors the analog signal to detect changes. This periodic sampling at lower resolution allows the system to maintain power efficiency while still being able to trigger high-resolution conversion when necessary. The periodic monitoring creates an opportunity structure for selective high-resolution sampling.
2Measurement precision
If a higher resolution ADC is used for continuous conversion, then measurement precision is improved, but productivity increases due to more efficient bandwidth usage
Solution Approach 1:
The system dynamically adjusts its conversion resolution based on signal activity. By switching to high-resolution mode only when signal changes occur, the system maximizes the useful information captured per conversion cycle, thereby improving bandwidth efficiency. The dynamic adaptation prevents waste of conversion resources on unchanged signals.
Solution Approach 2:
The conversion resolution parameter is changed based on signal conditions. The system transitions between different resolution states (low and high) depending on whether a signal change is detected. This parameter adaptation allows the system to optimize both precision and bandwidth efficiency by matching resolution to actual signal variability.
3Use of energy by moving object
If a dual-resolution ADC system is implemented, then use of energy is reduced, but device complexity increases
Solution Approach 1:
The ADC system is segmented into two functional parts: a lower resolution ADC for continuous monitoring and a higher resolution ADC for selective detailed conversion. This segmentation allows each component to be optimized for its specific function, with the lower resolution ADC handling the continuous low-power monitoring task and the higher resolution ADC being activated only when needed.
Solution Approach 2:
The lower resolution ADC acts as an intermediary that monitors the analog signal and triggers the higher resolution ADC when necessary. This intermediary layer filters out unnecessary high-resolution conversions by detecting only meaningful signal changes, thereby reducing the overall power consumption while maintaining the capability for high-precision measurement when required.
Data Source
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AI summary
A circuit includes a first external terminal, a first lower resolution analog-to-digital converter (LRADC) coupled to the external terminal and configured to perform a first conversion of an analog signal received at the external terminal to a digital value, and a higher resolution analog-to-digital converter (HRADC). The HRADC is configured to selectively receive the analog signal from the first external terminal based on the digital value. When the digital value outputted by the first LRADC indicates a change in value of the received analog signal, the HRADC is provided with the analog signal and performs a second conversion of the analog signal to a second digital value. The first LRADC has a lower conversion resolution as compared to the HRADC.