Fluctuating Oscillator Circuit Using Input Noise for Weak Signal Sensing
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Solution Overview
Problem
Conventional fluctuating oscillators require a noise generator, increasing circuit scale, cost, and power consumption, and require time and effort to adjust circuit parameters for natural frequency adjustments.
Innovation Solution
A fluctuating oscillator design that omits the noise generator by using an uncorrelated signal higher in frequency than the main signal as a noise source, allowing stochastic resonance to enhance signal sensing without the need for a noise generator, comprising an adder, threshold discrimination unit, transient response unit, and feedback loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a noise generator is included in the fluctuating oscillator, then the oscillator can achieve stochastic resonance to sense weak signals, but the circuit scale increases and cost increases
Solution Approach 1:
The patent extracts and removes the noise generator from the fluctuating oscillator circuit, replacing it with an uncorrelated signal source that is already present in the input signal. This extraction principle directly reduces circuit scale while maintaining the stochastic resonance effect needed for weak signal detection.
Solution Approach 2:
The patent makes the system self-sufficient by utilizing the uncorrelated signal component inherently present in the input signal as the noise source. This eliminates the need for an external noise generator, reducing circuit complexity while enabling the oscillator to perform self-adjustment and stochastic resonance without additional components.
2Measurement precision
If a noise generator is included in the fluctuating oscillator, then the oscillator can achieve stochastic resonance, but power consumption increases
Solution Approach 1:
The noise generator is extracted and removed from the circuit, eliminating its power consumption. The uncorrelated signal component is reused without requiring additional power, thus maintaining signal sensing capability while reducing overall power consumption of the system.
Solution Approach 2:
The system utilizes the existing uncorrelated signal in the input as the noise source, making the system self-sufficient and eliminating the need for dedicated power consumption for noise generation. The oscillator performs stochastic resonance using already-available signal energy.
3Measurement precision
If a noise generator is included in the fluctuating oscillator, then the oscillator can achieve stochastic resonance, but it takes time and effort to adjust the level of the noise signal when adjusting circuit parameters
Solution Approach 1:
The noise generator is removed from the circuit, eliminating the need to adjust its output level. The uncorrelated signal component is used directly without requiring level adjustment, thus reducing the time and effort needed for circuit parameter adjustment while maintaining stochastic resonance functionality.
Solution Approach 2:
The system automatically utilizes the uncorrelated signal component present in the input signal without requiring manual adjustment of noise levels. This self-adjusting mechanism eliminates the time-consuming process of tuning noise generator parameters when adjusting circuit settings.
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
This design reduces circuit scale and cost, saves time and effort in adjusting circuit parameters, and enables accurate sensing of weak signals like electroencephalograms without the need for a noise generator, achieving efficient stochastic resonance.
Implementation Method 1
a fluctuating oscillator, which is an oscillator using a stochastic resonance phenomenon in which a signal is boosted and a reaction is improved under a certain probability by adding noise to the signal
Data Source
AI summary
A fluctuating oscillator includes: an adder that has an input terminal to which an input signal including a main signal and an uncorrelated signal that is uncorrelated with the main signal and is higher in frequency than the main signal is input, and adds a feedback signal to the input signal; a threshold discrimination unit that generates a pulse signal by comparing an addition signal added by the adder with a threshold; a transient response unit that generates an output signal by transiently responding the generated pulse signal; and a feedback loop that feeds back the output signal to the adder as the feedback signal.