RFID Rectifier Bias Current Reuse for Multi-Stage Biasing
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Solution Overview
Problem
Existing RFID systems face inefficiencies in biasing multiple rectifying elements, leading to increased circuit complexity and area requirements due to the need for multiple bias currents and paths.
Innovation Solution
A rectifier design that uses a single bias current or bias current path to simultaneously bias multiple rectifying elements, achieving this through current reuse and central bias adjustment, thereby reducing the number of required bias currents and paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple bias currents and paths are used to bias multiple rectifying elements, then each rectifier stage can be properly biased, but the circuit complexity and area requirements increase
Solution Approach 1:
The patent combines multiple bias current paths into a single shared bias current path that serves multiple rectifier stages. The bias current is generated once and distributed to multiple rectifying elements through current mirrors, reducing the number of separate bias circuits from multiple independent paths to a single unified path.
Solution Approach 2:
The single bias current path serves multiple functions by providing bias current to multiple different rectifier stages simultaneously. The bias current generator becomes a universal source that can bias any number of rectifying elements, making the biasing system multi-functional rather than dedicated to each stage.
2Reliability
If multiple bias currents and paths are used to bias multiple rectifying elements, then each rectifier stage can be properly biased, but the area required for biasing circuitry increases
Solution Approach 1:
The patent merges multiple separate bias current generators into a single compact bias current source. By sharing the bias current path and using current mirror techniques, the physical area required for biasing circuitry is reduced from multiple distributed generators to one centralized source that serves all rectifier stages.
Solution Approach 2:
Instead of generating separate bias currents for each rectifier stage, the patent discards the redundant generation circuits and recovers the biasing function through a single shared path that is efficiently distributed to all stages, eliminating unnecessary circuit area.
3Device complexity
If a single bias current path is used to bias multiple rectifying elements, then circuit complexity and area are reduced, but the biasing of multiple rectifier stages must be achieved through current reuse
Solution Approach 1:
The patent segments the single bias current path into multiple distributed current paths using current mirrors. The master bias current is divided and allocated to individual rectifier stages through isolated current mirror circuits, allowing independent control and adaptation for each stage while maintaining a unified source.
Solution Approach 2:
The patent introduces current mirrors as intermediary elements between the single bias current source and the multiple rectifier stages. These current mirrors act as mediators that translate the single bias current into multiple stage-specific bias currents, providing adaptability without requiring multiple independent sources.
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 area required for biasing circuitry, and enhances the efficiency of power management in RFID systems by minimizing the complexity of biasing multiple rectifier stages.
Implementation Method 1
A rectifier that has multiple rectifier stages coupled together serially includes a bias current path coupled to each of the rectifier stages. The bias current path is configured to simultaneously bias rectifying elements in each of the rectifier stages
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.