RFID Rectifier Bias Current Reuse Through Resistive Ladder Biasing
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Solution Overview
Problem
Existing RFID systems face inefficiencies in powering and biasing multiple rectifier stages, leading to increased circuit complexity and area requirements due to the need for multiple bias currents and current mirrors.
Innovation Solution
A central biasing scheme that reuses bias currents to simultaneously bias multiple rectifier stages, reducing the number of required bias currents and circuitry by using resistive ladders to create bias current paths that can voltage-bias multiple stages with fewer bias currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple bias currents are used to bias multiple rectifier stages, then each rectifier stage can be properly biased, but the circuit complexity and area increase due to multiple current mirrors
Solution Approach 1:
A single bias current path is designed to serve multiple rectifier stages simultaneously. The bias current generated by one current mirror is distributed to multiple rectifier stages through shared current paths, allowing one bias current to perform the function of multiple separate bias currents, thereby reducing circuit complexity while maintaining proper biasing of all stages
Solution Approach 2:
Multiple separate bias current paths are merged into a single shared bias current path. The patent combines the biasing functions for multiple rectifier stages into one unified current path, eliminating the need for separate current mirrors for each stage and reducing the overall circuit area and complexity
2Reliability
If multiple bias currents are used to bias multiple rectifier stages, then each stage operates independently, but the circuit area increases due to multiple current mirrors
Solution Approach 1:
The single bias current path is designed to universally serve multiple rectifier stages, eliminating the need for multiple separate current mirrors. This multi-functional approach reduces the total circuit area while ensuring each stage receives appropriate bias current through the shared path
Solution Approach 2:
The patent merges multiple bias current generation circuits into one, consolidating the area required for multiple current mirrors into a single compact bias current path that serves all rectifier stages, thereby reducing the overall circuit footprint
3Device complexity
If a single bias current path is used, then circuit complexity is reduced, but the ability to independently bias multiple stages is limited
Solution Approach 1:
The bias current path is designed to be dynamically adjustable, allowing the single bias current to be flexibly distributed to different rectifier stages as needed. This dynamic capability enables the system to adapt to different operating conditions and stage requirements while maintaining a simple unified circuit structure
Solution Approach 2:
The patent employs parameter changes in the bias current distribution, allowing the single bias current to be adjusted in magnitude and allocation to suit different rectifier stage requirements. By changing current parameters dynamically, the system maintains versatility despite using a single bias current path
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 simplifies the circuit design, reduces the number of bias currents needed, and enhances the efficiency of rectifier performance by allowing for central bias adjustment and current reuse, thereby improving power management in RFID systems.
Implementation Method 1
using resistive ladders to create bias current paths that can voltage-bias multiple stages with fewer bias currents
Data Source
AI summary
Embodiments are directed to rectifiers using a single bias current or bias current path to bias multiple rectifying elements. A rectifier that has multiple rectifier stages coupled together serially includes a bias current path coupled to each of the rectifier stages. Thee bias current path is configured to simultaneously bias rectifying elements in each of the rectifier stages by using a bias current to bias a first rectifying element and reusing the bias current to bias other rectifying elements.