Biological Sensor Data Acquisition Circuit for Multi-Band Signal Capture
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Solution Overview
Problem
Existing biological sensors and data acquisition circuits fail to meet the requirements for multi-channeling and broadbanding, limiting their ability to acquire a plurality of types of biological information effectively.
Innovation Solution
The data acquisition circuit employs a series configuration of multiple signal processors, including first and second analog chopper circuits, amplifiers, and filters, coupled with converters and digital chopper circuits to process analog and digital signals in different modes, enabling multi-channel and broadband data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a biological sensor uses a single data acquisition circuit for multiple biological information types, then multi-channeling and broadbanding are achieved, but the circuit cannot appropriately acquire biological information in different frequency bands simultaneously
Solution Approach 1:
The patent implements dynamic switching between two operational modes: first mode where analog filters are active for low-frequency signals (e.g., electrocardiogram) and second mode where digital filters are active for high-frequency signals (e.g., heart sound). This dynamic reconfiguration allows the single data acquisition circuit to adapt to different frequency bands while maintaining acquisition accuracy for each type of biological information.
Solution Approach 2:
The patent changes the filtering parameter configuration based on the target biological information. In the first mode, analog filters with specific cutoff frequencies are used to process low-frequency signals. In the second mode, digital filters with different characteristics are employed for high-frequency signals. This parameter change enables the circuit to maintain reliability across different frequency bands.
2Reliability
If separate data acquisition circuits are used for different frequency bands, then acquisition accuracy is maintained, but device complexity and circuit size increase
Solution Approach 1:
The patent designs a universal data acquisition circuit that can perform multiple functions by switching between two modes. The same circuit hardware processes both low-frequency biological information (using analog filters in first mode) and high-frequency biological information (using digital filters in second mode), eliminating the need for separate dedicated circuits for each frequency band while maintaining acquisition accuracy.
Solution Approach 2:
The patent merges the functionality of multiple frequency-specific circuits into a single integrated data acquisition circuit. By combining analog filtering capability (first mode) and digital filtering capability (second mode) within one circuit, the patent reduces device complexity while preserving the ability to accurately acquire different types of biological information.
3Reliability
If multiple dedicated circuits are provided for different biological information types, then acquisition performance is optimized, but power consumption and circuit size increase
Solution Approach 1:
The patent creates a multi-functional data acquisition circuit that serves multiple biological information types through mode switching. The same physical circuit processes both low-frequency signals (electrocardiogram in first mode) and high-frequency signals (heart sound in second mode), eliminating the need for multiple dedicated circuits and thereby reducing power consumption while maintaining optimized acquisition performance for each type.
Solution Approach 2:
The patent employs periodic mode switching between first mode (analog filtering) and second mode (digital filtering) based on the type of biological information being acquired. This periodic reconfiguration allows a single circuit to deliver optimized performance for different signal types without the continuous power consumption that would result from running multiple dedicated circuits simultaneously.
Data Source
AI summary
A data acquisition circuit includes a plurality of signal processors including a first analog chopper circuit, an amplifier, a second analog chopper circuit, and an analog filter that are coupled in series, respectively. The data acquisition circuit during a first mode converts analog signals from analog filters into a serial signal and converts the serial signal into a digital signal, and filters the digital signal after converting the digital signal into parallel signals. The data acquisition circuit during a second mode converts the analog signals from the amplifiers into the serial signal and converts the serial signal into the digital signal, outputs the digital signal to the digital chopper circuit, and filters the digital signal after converting the digital signal from the digital chopper circuit into parallel signals. Thus, biological information in the plurality of frequency bands can be appropriately acquired.