Injection-Locked Frequency Multiplier for Low-Noise Displacement Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing detectors for object displacement using the Doppler effect face challenges with high-frequency signal processing, leading to reduced signal-to-noise ratio (SNR) due to flicker noise and high power consumption, as they typically rely on analog processes and high-frequency oscillation sources.
Innovation Solution
A detector incorporating a frequency multiplier that uses injection locking and pulling to generate an output signal at a multiple of the input frequency, allowing for reduced oscillation source frequency and improved digital signal processing, thereby decreasing power consumption and mitigating flicker noise effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high frequency oscillation source is used to detect displacement by the Doppler effect, then the displacement detection capability is improved, but the power consumption increases and flicker noise affects the signal quality
Solution Approach 1:
The patent divides the frequency multiplication process into multiple stages using a chain of frequency multipliers (e.g., first frequency multiplier, second frequency multiplier, third frequency multiplier) that sequentially multiply the frequency. This segmentation allows the system to achieve high output frequencies while maintaining lower operating frequencies for the individual oscillator and intermediate stages, thereby reducing power consumption and minimizing flicker noise effects at each stage.
2Measurement precision
If a high frequency oscillation source is used for displacement detection, then the displacement detection capability is improved, but the signal-to-noise ratio is reduced due to flicker noise
Solution Approach 1:
The patent segments the frequency multiplication into multiple stages, where each frequency multiplier operates at a lower frequency than the final output frequency. This segmentation reduces flicker noise because each stage operates at a frequency where flicker noise has less impact, and the noise does not accumulate as severely as it would in a single high-frequency stage.
Solution Approach 2:
The patent introduces intermediate frequency signals as mediators between the low-frequency oscillator output and the high-frequency detection signal. Each frequency multiplier acts as an intermediary stage, progressively increasing the frequency while allowing for noise management and signal conditioning at each intermediate step, thereby maintaining a higher signal-to-noise ratio.
3Measurement precision
If a high frequency oscillation source is used, then the displacement detection capability is improved, but the difficulty of digital signal processing increases
Solution Approach 1:
The patent segments the frequency processing into multiple manageable stages using a chain of frequency multipliers. Each stage operates at a lower frequency that is more amenable to digital signal processing, allowing for easier implementation of digital processing techniques at each intermediate stage rather than attempting to process a single high-frequency signal directly.
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 solution effectively reduces power consumption and minimizes the impact of flicker noise, enabling more efficient digital signal processing and maintaining a higher signal-to-noise ratio by operating at lower frequencies and processing intermediate frequencies.
Implementation Method 1
The frequency multiplier is used to output the output signal at a frequency substantially equal to a multiple of the first frequency by injection locking
Implementation Method 2
pull the output signal to the second frequency by injection pulling
Implementation Method 3
a detector detecting the status of displacement of an object by the Doppler effect
Data Source
AI summary
A detector includes a frequency multiplier and a transceiving node. The frequency multiplier includes a first terminal, a second terminal and an output terminal. The first terminal is used to receive a first injection signal having a first frequency. The output terminal is used to output an output signal. The second terminal is used to receive a second injection signal having a second frequency. The frequency multiplier is used to output the output signal at a frequency substantially equal to a multiple of the first frequency by injection locking and pull the output signal to the second frequency by injection pulling. The transceiving node is coupled to the output terminal and the second terminal of the frequency multiplier. The transceiving node is used to transmit the output signal, and receive a received signal having a third frequency. The received signal is used to update the second injection signal.