ADC Decimation Filtering for Narrowband Multi-Channel Sensing
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Solution Overview
Problem
Current data communication systems face challenges in efficiently processing and interpreting signals from various sensors across different physical conditions, such as temperature, pressure, and touch, due to limitations in sensor drive circuits that affect signal quality and accuracy.
Innovation Solution
The implementation of a communication system with drive-sense circuits that provide regulated power signals to sensors, detect changes in these signals, and generate representative signals for processing, enabling accurate interpretation of physical conditions and facilitating communication between sensors and computing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If very narrow bandpass digital filtering is implemented to process sensor signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The signal processing is divided into multiple stages: an initial filtering stage that processes all sensor signals, followed by separate very narrow bandpass filtering stages for different frequency ranges. This segmentation allows complex filtering to be applied selectively only to relevant signals, reducing overall system complexity while maintaining high measurement precision for target frequencies.
Solution Approach 2:
A preliminary filtering operation is performed before the very narrow bandpass filtering. This preliminary action removes obvious out-of-band signals and noise, so that the subsequent complex very narrow bandpass filtering operates on already-preprocessed signals, reducing its computational burden and complexity while maintaining measurement precision.
2Productivity
If multiple sensor channels are processed simultaneously, then productivity is improved, but device complexity increases
Solution Approach 1:
Multiple sensor channels are processed by dividing them into groups based on their frequency ranges. Each group is handled by a dedicated processing path with optimized filtering parameters. This segmentation enables parallel processing of multiple channels while reducing the complexity of each individual processing path, as each path only needs to handle a subset of channels with similar characteristics.
Data Source
AI summary
An analog to digital conversion circuit includes an analog to digital converter (ADC) circuit operable to convert an analog signal having an oscillation frequency into a first digital signal having a first data rate frequency. The analog signal includes a set of pure tone components. The first digital signal includes n 1-bit channels. The analog to digital conversion circuit further includes a digital decimation filtering circuit including n anti-aliasing filters operable to sample and filter the n 1-bit channels of the first digital signal to produce n second digital signals and n decimator circuits operable to decimate the n second digital signals to produce n third digital signals at a second data rate frequency. The analog to digital conversion circuit further includes a multiplexor operable to output the n third digital signals at the second data rate frequency on a single bus.