Mode Switch Current Detection Module for Signal Differentiation
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Solution Overview
Problem
Existing current detection systems struggle to accurately differentiate and quantify contributions from a specific source of interest from ambient sources, often due to unpredictable ambient interference and the need to choose distinct frequencies, which can lead to incomplete signal extraction and increased noise.
Innovation Solution
A current detection module that synchronizes with pulsed signals from the source of interest, allowing for phase relationship alignment and effective rejection of ambient noise, enabling precise measurement of both target and ambient contributions through mode-switching configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system uses frequency separation to distinguish target source from ambient sources, then signal differentiation is improved, but measurement precision deteriorates due to incomplete signal extraction and increased noise
Solution Approach 1:
The patent applies periodic action by modulating the target light source at a specific frequency and using synchronous detection to detect only signals at that frequency. The detector is synchronized to the modulation frequency of the target source, allowing it to selectively amplify and detect the modulated signal while rejecting ambient light that does not share the same frequency characteristics. This periodic modulation approach transforms a static detection problem into a dynamic frequency-domain separation problem.
Solution Approach 2:
The patent introduces an intermediary modulation signal as a carrier to encode the target source information. By modulating the target light source with a known frequency signal, the system creates an intermediary carrier wave that carries the target information. The synchronous detector acts as another intermediary, using the same modulation frequency as a reference to demodulate and extract the target signal from the mixed ambient background.
2Adaptability or versatility
If the system integrates multiple measurement modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by designing a single detection circuit that can perform multiple measurement functions through software or control signal configuration. The same hardware circuitry is used for both frequency-separated target detection and ambient-only detection modes. By making the detection system universal, the patent avoids duplicating hardware for different measurement modes, thereby reducing overall device complexity while maintaining measurement flexibility.
Solution Approach 2:
The patent applies dynamics by making the detection system reconfigurable through dynamic mode switching. The system can dynamically change its measurement mode (target-focused or ambient-focused) based on external control signals or environmental conditions. This dynamic adaptability allows the same hardware to optimize its performance for different measurement scenarios without requiring physical reconfiguration or multiple dedicated circuits.
3Measurement precision
If the system uses synchronous detection with pulse synchronization, then signal extraction is improved, but loss of time occurs during synchronization setup
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing the detector to the expected pulse frequency and phase characteristics of the target source before actual measurement begins. The system establishes the synchronization relationship in advance, allowing it to immediately begin accurate synchronous detection without requiring time-consuming adaptive synchronization during the measurement process. This preliminary setup ensures that the detector is ready to extract signals efficiently from the moment measurement starts.
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 module achieves low-noise, high dynamic range, and low-power operation while rejecting uncorrelated ambient sources, allowing for simultaneous sampling of multiple channels and flexible sampling modes, thereby enhancing signal extraction and reducing interference.
Implementation Method 1
When a photon of sufficient energy strikes the photodiode, it excites electrons, creating free electrons and positively charged electron holes. The holes move toward the anode, and electrons toward the cathode, and a photocurrent is produced proportional to the amount of incident light on the photodiode.
Data Source
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AI summary
Present disclosure relates to a current detection module capable of differentiating and quantifying contribution to a current signal generated by a sensor in response to stimulation by a certain target source from contributions from sources other than the target source (ambient sources). As long as the contribution from the target source comprises a pulsed signal, the module synchronizes itself to the pulse(s) so that there is a predetermined phase relationship between the pulse(s) and functions carried out by various stages of the module. The module may be re-used to also detect and quantify contributions from ambient sources by presenting these contributions to the module as pulses that trigger synchronization of the module. To that end, a detection system disclosed herein is based on the use of such current detection module and allows mode switching where, depending on the selected mode of operation, the module is configured to perform different measurements.