Dynamic Current Mirror Rectifier for Transistor Mismatch Accuracy
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Solution Overview
Problem
Conventional rectifiers face issues with transistor mismatches leading to inaccuracies in current conversion, particularly in rectification circuits using multiple diodes or transistors.
Innovation Solution
A dynamic current rectifier utilizing dynamic current mirrors with a single transistor for both input and output roles, employing a controller to manage switches and current mirrors to ensure accurate conversion of oscillating bi-directional current into an absolute value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional rectifiers use multiple transistors arranged in rectification circuits, then rectification functionality is achieved, but transistor mismatches cause inaccuracies in current conversion
Solution Approach 1:
The patent combines the input and output transistor functions into a single dynamic current mirror transistor. This single transistor performs both the input current reception and output current generation functions, eliminating the matching errors that would occur between separate transistors. The dynamic current mirror architecture allows one transistor to effectively serve dual purposes that traditionally required multiple matched transistors.
Solution Approach 2:
The dynamic current mirror transistor exhibits multi-functionality by serving as both the input transistor and output transistor in the rectification process. This universal component handles multiple roles within the circuit, reducing the total number of transistors needed and eliminating matching issues between dedicated input and output transistors.
2Measurement precision
If dynamic current mirrors use a single transistor for both input and output roles, then transistor mismatch issues are addressed, but circuit complexity increases with additional switches and control mechanisms
Solution Approach 1:
The patent employs dynamic switching mechanisms that allow the circuit configuration to change over time. Switches dynamically connect and disconnect different circuit paths based on the operating phase, enabling a single transistor to function as both input and output device. This dynamic reconfiguration manages the inherent complexity by organizing it into controlled temporal phases rather than static complex interconnections.
Solution Approach 2:
The circuit operates through periodic switching cycles where different transistors and current mirrors are activated in alternating phases. This periodic operation allows the system to manage complexity by dividing the rectification function into sequential stages, with each stage using simplified circuit configurations that switch periodically to complete the full rectification cycle.
Data Source
AI summary
A dynamic current rectifier includes an input terminal for receiving an input current, an output terminal for outputting a rectified output current, a first current mirror, a second current mirror, a first switch having a first terminal coupled to the input terminal and a second terminal coupled to the first current mirror, a second switch having a first terminal coupled to the output terminal and a second terminal coupled to the first current mirror, a third switch having a first terminal coupled to the input terminal and a second terminal coupled to the second current mirror, and a fourth switch having a first terminal coupled to the output terminal and a second terminal coupled to the second current mirror.