Single-Comparator ADC With Capacitor Network for Accurate Signal Comparison
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Solution Overview
Problem
Existing analog to digital converter (ADC) technologies face inefficiencies in comparing subsequent analog signal values against digital results, particularly in optimizing the comparator function for timely and accurate conversion, especially when dealing with multiple analog signals from diverse sources.
Innovation Solution
The implementation of a technique that uses a capacitor network configured by switches and a single analog comparator, where the comparator compares a voltage value against a threshold value adjusted during sampling, allowing for programmable conversion modes and controlled timing sequences to optimize the conversion and compare actions, enabling efficient processing of multiple analog signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single analog comparator is used with a capacitor network, then device complexity is reduced, but measurement precision may be compromised
Solution Approach 1:
The conversion process is divided into distinct phases: sampling phase where capacitors charge to analog input voltage, and conversion phase where capacitors are switched to reference voltages. This temporal segmentation allows a single comparator to perform multiple comparison operations sequentially, reducing hardware complexity while maintaining precision through controlled timing sequences.
Solution Approach 2:
Capacitors are pre-charged to the analog input voltage during the sampling phase before the comparison process begins. This preliminary action stores the analog signal energy in the capacitors, enabling subsequent digital-to-analog conversion and comparison without requiring additional analog signal paths or comparators.
2Productivity
If conversion and compare actions are performed sequentially with controlled timing, then productivity is improved, but loss of time increases
Solution Approach 1:
The ADC operates through periodic cycles of sampling, conversion, and comparison phases controlled by timing signals. Each cycle processes one analog input value through defined stages, enabling predictable and repeatable conversion timing. The periodic nature allows optimization of each phase duration to balance speed and accuracy requirements.
Solution Approach 2:
While one capacitor is being compared during the conversion phase, other capacitors can be preparing for the next comparison or sampling new inputs. The timing controller coordinates multiple operations to overlap useful actions, minimizing idle time and maximizing productivity without sacrificing measurement accuracy.
3Adaptability or versatility
If threshold value is adjusted during sampling phase, then adaptability is improved, but device complexity increases
Solution Approach 1:
The threshold value applied during comparison is dynamically selected based on the digital code being tested and the reference voltage connections. The timing controller dynamically switches capacitor connections to different reference voltages (Vref+, Vref-, or ground) depending on the conversion stage, enabling adaptable threshold values without additional hardware complexity.
Solution Approach 2:
The same capacitor network and single comparator are used for multiple functions: sampling the analog input, storing the sampled value, performing digital-to-analog conversion by switching to reference voltages, and comparing the converted value. This multi-functionality provides conversion mode flexibility while minimizing device complexity through resource sharing.
Data Source
AI summary
This disclosure relates to analog to digital converter (ADC) component with a comparator function for analog signals.