Impedance Matching Circuit Resonance Detection by Phase Difference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional short-range wireless communication devices experience excessive delay in detecting resonant frequencies, which affects communication quality due to the reliance on timing periods over multiple turn-off periods.
Innovation Solution
The implementation of a method that detects the resonant frequency by calculating the phase difference between a recovered clock signal and a reference clock signal during a single turn-off period, utilizing an impedance matching circuit and processing circuitry to extract and analyze the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional resonant frequency detection methods are used, then detection accuracy can be maintained, but detection time becomes excessively long due to reliance on multiple turn-off periods
Solution Approach 1:
The patent performs preliminary actions by using the turn-on period to excite the resonant frequency in the impedance matching circuit before the turn-off period. This preliminary excitation allows the system to have the resonant oscillation already established before detection begins, eliminating the need for multiple turn-off periods to build up the resonance. The detection can start immediately in the first turn-off period with sufficient signal amplitude.
Solution Approach 2:
The patent maintains continuity of useful action by using both the turn-on period (for excitation) and turn-off period (for detection) in a seamless alternating manner. The resonant excitation during turn-on continuously feeds into the detection phase during turn-off, creating an uninterrupted detection process that eliminates the waiting time required by conventional methods to accumulate sufficient signal over multiple cycles.
2Reliability
If resonant frequency detection is performed using multiple turn-off periods, then signal quality can be ensured, but communication quality deteriorates due to excessive delay
Solution Approach 1:
The turn-on period serves as a preliminary action that pre-excites the resonant frequency in the impedance matching circuit. This preliminary excitation ensures that when the turn-off period begins, the resonant oscillation is already at full amplitude, providing high-quality detection signals immediately without requiring multiple accumulation periods.
Solution Approach 2:
The patent utilizes the natural periodic alternation between turn-on and turn-off periods of the NFC communication protocol. By synchronizing the resonant excitation and detection with this existing periodic action, the system achieves rapid resonant frequency detection within a single cycle, improving communication quality by eliminating excessive delay while maintaining signal quality through proper timing.
3Measurement precision
If conventional detection methods are used, then measurement precision can be maintained, but operational efficiency decreases due to excessive delay
Solution Approach 1:
The turn-on period performs the preliminary action of exciting the resonant frequency in the impedance matching circuit. This pre-excitation ensures that the oscillation reaches steady-state amplitude before the turn-off period begins, providing measurement precision equivalent to conventional methods that wait for signal accumulation, but achieves this in a single cycle rather than multiple periods.
Solution Approach 2:
The continuous alternation between turn-on (excitation) and turn-off (detection) periods creates an uninterrupted measurement process. The useful action of building resonant oscillation during turn-on seamlessly transitions into the detection action during turn-off, eliminating the idle waiting time in conventional methods and achieving both high measurement precision and operational efficiency.
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 approach significantly reduces the detection time for resonant frequencies, improving communication quality by enabling faster correction of signal distortions and enhancing operational efficiency.
Implementation Method 1
A resonant frequency of a short-range wireless communication device may be determined by a combination of various radio-frequency (RF) components, such as an impedance matching circuit, included in the short-range wireless communication device
Implementation Method 2
processing circuitry configured to extract a recovered clock signal from the sensing signal, detect a phase difference between the recovered clock signal and the reference clock signal, and detect a resonant frequency of the impedance matching circuit based on the phase difference
Data Source
AI summary
A short-range wireless communication device includes an impedance matching circuit configured to output a radio frequency (RF) signal in a turn-on period, the RF signal being based on a reference clock signal, and output a sensing signal in a turn-off period, and processing circuitry configured to extract a recovered clock signal from the sensing signal, detect a phase difference between the recovered clock signal and the reference clock signal, and detect a resonant frequency of the impedance matching circuit based on the phase difference.