RFID Transmitter Waveform Self-Measurement for RF Compliance
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Solution Overview
Problem
Existing RFID communication systems require complex and expensive test equipment to ensure compliance with RF-Field emission standards, necessitating the measurement of wave shape parameters like overshoot, undershoot, and non-monotonic edges, hindering fast implementation of new applications.
Innovation Solution
Incorporating a wave shape measurement stage within the transmitter using equivalent time sampling to measure the shape of the received modulated data signal, eliminating the need for external test equipment by utilizing a delay stage, mixer, DC compensation, and AD converter to process the signal internally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external test equipment is used to measure wave shape parameters, then measurement accuracy is ensured, but device complexity and cost increase
Solution Approach 1:
The patent combines the wave shape measurement functionality with the transmitter itself by integrating a delay stage, mixer, and AD converter within the transmitter circuitry. This merging eliminates the need for separate external test equipment, thereby reducing device complexity and cost while maintaining measurement capability through the integrated equivalent time sampling system
Solution Approach 2:
The transmitter performs self-measurement of its own output wave shape parameters through the integrated measurement stage. The transmitter uses its internal resources (delay stage, mixer, AD converter) to measure parameters like overshoot, undershoot, and non-monotonic edges of its own transmitted signal, eliminating dependency on external measurement equipment
2Reliability
If external test equipment is used to measure wave shape parameters, then reliable compliance verification is achieved, but implementation time increases
Solution Approach 1:
The transmitter performs self-verification of compliance with RF-Field emission standards through its integrated wave shape measurement stage. By measuring its own output parameters (overshoot, undershoot, non-monotonic edges) in real-time, the transmitter can immediately verify compliance without waiting for external test equipment, thereby reducing implementation time while maintaining reliable verification
Solution Approach 2:
The integrated measurement stage provides immediate feedback about wave shape parameters to the transmitter system. This feedback loop enables real-time compliance verification and potential automatic adjustment, eliminating the time delay associated with external measurement and analysis processes
3Device complexity
If integrated wave shape measurement is implemented, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent implements equivalent time sampling using periodic action, where the delay stage introduces variable time delays to successive copies of the transmitted signal. By sampling at different time points across multiple signal periods and combining the samples, the system achieves high measurement precision equivalent to having a much higher sampling rate, thereby maintaining accuracy despite the integrated simplified architecture
Solution Approach 2:
The measurement system uses dynamic delay adjustment where the delay time is varied in a controlled manner to capture different portions of the wave shape. This dynamic timing control allows the integrated measurement stage to accurately capture transient features like overshoot and undershoot, maintaining measurement precision while keeping the device complexity low
4Ease of manufacture
If self-testing capability is added to the transmitter, then cost is reduced, but device complexity increases
Solution Approach 1:
The patent merges the measurement functions (delay stage, mixer, AD converter) directly into the transmitter IC, eliminating the need for separate external measurement devices. This consolidation reduces overall system cost by removing the need for expensive external test equipment while the integrated components share the transmitter's power supply and control infrastructure, minimizing the actual increase in internal complexity
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
Enables self-testing of wave shape compliance with RF-Field standards, reducing technical complexity and cost by integrating wave shape measurement capabilities within the transmitter, facilitating faster development and implementation of new applications.
Implementation Method 1
a transmitter stage to generate the amplitude modulated transmitter data signal with a particular frequency and waveform based on a carrier signal generated by a carrier signal stage
Implementation Method 2
an antenna connected to the transmitter stage via a matching circuit to transmit the amplitude modulated transmitter data signal in resonance in the RF-Field over the air
Implementation Method 3
a receiver stage connected via the matching circuit to the antenna to receive the modulated receiver data signal
Data Source
AI summary
A transmitter of an RFID communication system to transmit an amplitude modulated transmitter data signal in resonance in an RF-Field over the air and to receive a modulated receiver data signal, which transmitter comprises: a transmitter stage to generate the amplitude modulated transmitter data signal with a particular frequency and waveform based on a carrier signal generated by a carrier signal stage; an antenna connected to the transmitter stage via a matching circuit to transmit the amplitude modulated transmitter data signal in resonance in the RF-Field over the air; a receiver stage connected via the matching circuit to the antenna to receive the modulated receiver data signal; wherein the transmitter furthermore comprises a wave shape measurement stage to measure the shape of the received modulated receiver data signal with equivalent time sampling.