RFID Power Supply Delay Circuit Stabilization
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Solution Overview
Problem
Passive RFID tags using EEPROM memory are inadequate for high-throughput applications due to slow data transfer rates, and FRAM memory, although faster, faces challenges in the RFID environment with process variations, temperature changes, and intermittent power supply issues.
Innovation Solution
A delay circuit for an RFID tag power supply is introduced, featuring a cascade connection of passive, ramp, and current mirror circuits to stabilize and regulate the power supply, preventing overshoot and ensuring stable operation across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FRAM memory is used to increase data throughput, then productivity is improved, but reliability deteriorates due to sensitivity to power supply variations and temperature changes
Solution Approach 1:
The patent implements preliminary power supply stabilization through delay circuits that control the timing of power delivery to different circuit blocks. The power supply circuit delays the activation of FRAM memory until the power supply is fully stable, preventing premature operation that would cause reliability issues. This preliminary action ensures that when FRAM memory does operate, it does so under stable conditions, resolving the contradiction between high throughput and operational reliability.
2Productivity
If power supply is provided immediately to enable fast operation, then productivity is improved, but reliability worsens due to power supply overshoot and instability
Solution Approach 1:
The power supply circuit performs preliminary stabilization by delaying power delivery to FRAM memory until voltage levels are fully settled. The delay circuit monitors power supply stability and only enables memory operation when conditions are appropriate, preventing overshoot-related failures while maintaining fast operational response.
Solution Approach 2:
The patent implements beforehand cushioning by using delay circuits to buffer the power supply transition. Instead of immediately providing full power that could cause overshoot, the circuit gradually enables power delivery and includes protection mechanisms that cushion against voltage spikes, ensuring stable operation from the outset.
3Reliability
If delay circuits are added to stabilize power supply, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the power supply circuit into distinct functional blocks: a power supply input stage, delay circuits for timing control, and separate output stages for different circuit blocks. This modular segmentation allows each component to be optimized independently while maintaining overall simplicity and reliability.
Data Source
AI summary
A delay circuit for an RFID tag includes a power supply input and a power supply output and one or more delay circuits in cascade connection between the power supply input and the power supply output. A first delay circuit includes a passive circuit, a second delay circuit includes a ramp circuit, and a third delay circuit includes a current mirror circuit.