RFID Tag Signal Reception Circuit with Dynamic Amplitude Control
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Solution Overview
Problem
Conventional RFID tags face challenges in signal reception due to irregular signal amplitudes caused by distance or obstacles, leading to deteriorated performance.
Innovation Solution
The RFID tag incorporates a voltage generator, common gate circuit, current/voltage converter, low-pass filter, buffer, and control circuit to convert and buffer signals within an operational range, using transistors and resistors to adjust resistance values based on signal amplitudes, ensuring consistent signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional signal reception methods are used in RFID tags, then the device structure remains simple, but signal reception performance deteriorates due to irregular signal amplitudes from distance or obstacles
Solution Approach 1:
The patent implements dynamic signal amplitude adjustment through a control circuit that automatically regulates the amplitude of received signals. The control circuit monitors signal strength and dynamically adjusts the amplitude to maintain optimal levels for subsequent processing, enabling the RFID tag to handle irregular signal amplitudes from varying distances or obstacles while preserving reliable signal reception performance.
Solution Approach 2:
The patent changes the amplitude parameter of the received signal through a dedicated control circuit. By adjusting the amplitude parameter dynamically based on received signal strength, the system ensures that signals within the buffer's operation range are properly conditioned, thereby improving signal reception reliability without requiring complete redesign of the signal processing architecture.
2Stability of the object's composition
If signal amplitude is not adjusted, then the circuit operation remains simple, but signal quality varies with distance and obstacles
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit continuously monitors the amplitude of received signals and adjusts the signal amplitude accordingly. This closed-loop feedback system ensures that signal quality remains consistent regardless of distance or obstacles, as the control circuit compensates for amplitude variations by adjusting the signal level to maintain optimal quality for buffer operation.
3Measurement precision
If the buffer operates outside its operation range, then the circuit design is simpler, but signal processing accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by adjusting the signal amplitude before it enters the buffer stage. The control circuit pre-conditiones the signal by regulating its amplitude to fall within the buffer's operation range, ensuring that subsequent signal processing occurs with high accuracy. This preliminary amplitude adjustment prevents distortion and maintains measurement precision throughout the signal processing chain.
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 configuration enhances signal reception performance by maintaining signal quality across varying amplitudes, reducing the impact of obstacles and distance on RFID tag functionality.
Implementation Method 1
a voltage generator configured to generate a voltage signal from a reception signal
Implementation Method 2
a common gate circuit configured to convert the voltage signal into a current signal
Implementation Method 3
a current/voltage converter configured to convert the current signal into a converted voltage signal by controlling a resistance value
Data Source
AI summary
Provided are a radio frequency identification (RFID) tag and a method for receiving a signal of the RFID tag. The RFID tag includes a voltage generator configured to generate a voltage signal from a received signal, a common gate circuit configured to convert the voltage signal into a current signal, a current/voltage converter configured to the current signal into a voltage signal by using a resistance value, a low-pass filter configured to perform low-pass filtering on the converted voltage signal, a buffer configured to buffer the low-pass-filtered voltage signal within an operation range, and a peak detector configured to detect a peak value from the buffered signal to demodulate information data. The current/voltage converter controls the resistance value to convert the current signal into a voltage signal included within the operation range of the buffer.