Load Calibration Circuit for Precise Driver Impedance Adjustment
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Solution Overview
Problem
The impedance of resistance elements in driving circuits often deviates from the acceptable range due to process and environmental variations, necessitating a calibration scheme to ensure correct operation, but existing methods are costly and lack accuracy.
Innovation Solution
A driving circuit and method utilizing reference current sources, switch units, and a calibration module to calibrate the impedance of a load unit by injecting and sinking a reference current, and using a comparator and decision logic to adjust the impedance based on output port voltages, allowing for precise calibration of adjustable resistance elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adjustable resistance elements are used to compensate for impedance variation, then the driving circuit can operate correctly within acceptable impedance ranges, but the production cost increases due to the need for calibration schemes
Solution Approach 1:
The calibration module automatically adjusts the impedance of the load unit by comparing the actual impedance with the target impedance and controlling the adjustable resistance elements accordingly, eliminating the need for manual calibration and reducing production costs
Solution Approach 2:
The calibration module measures the actual impedance of the load unit and uses this feedback information to automatically adjust the adjustable resistance elements, ensuring the impedance remains within the acceptable range without increasing production cost
2Adaptability or versatility
If traditional calibration schemes are used to adjust load unit impedance, then impedance can be modified, but the calibration accuracy is insufficient
Solution Approach 1:
The patent replaces traditional manual or mechanical calibration methods with an automated electronic calibration system that uses voltage measurements and control modules to precisely adjust impedance, significantly improving calibration accuracy
Solution Approach 2:
The calibration module creates a virtual model of the impedance calibration process by measuring voltages at output ports and calculating the actual impedance, allowing for precise digital adjustment without physical trial-and-error
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 reduces production costs and improves calibration accuracy by enabling precise impedance adjustment within acceptable ranges, ensuring reliable operation of the driving circuit.
Implementation Method 1
The calibration module is used for calibrating an impedance of the load unit according to a voltage at one of the output ports, wherein the voltage is generated due to the reference current passing through one of the two first switch units, the load unit and one of the two second switch units
Data Source
AI summary
A driving circuit includes: a first reference current source injects a reference current; each first switch unit is coupled between the first reference current source and one of first and second output ports; a second reference current source sinks the reference current; each second switch unit is coupled between the second reference current source and one of the output ports; a load unit is coupled between the output ports, and a common voltage is applied onto the load unit; and a calibration module calibrates an impedance of the load unit according to a voltage at one of the output ports, and the voltage is generated due to the reference current passing through one of the first switch units, the load unit, and one of the second switch units.