Temperature Compensating Active Resistance Circuit
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Solution Overview
Problem
Temperature variations in semiconductor and electronic circuits cause changes in electrical properties, making them unusable in applications where temperature changes occur, such as in sensors and communications, unless compensated for.
Innovation Solution
A circuit with an active resistance controller that adjusts an adjustable resistance using a proportional to absolute temperature (PTAT) source and temperature-stable source to counteract temperature effects, allowing selection of resistance magnitude and coefficient through external resistors, ensuring consistent operation across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If temperature compensation is implemented using active resistance controller, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the active resistance controller continuously monitors temperature variations and adjusts the resistance value accordingly. The controller receives temperature information from temperature-sensitive circuits and modifies the active resistance to counteract temperature effects, creating a closed-loop feedback system that maintains temperature stability without requiring complex external compensation circuits
Solution Approach 2:
The temperature compensation system utilizes the temperature-sensitive circuits already present in the device to provide temperature information for compensation. The active resistance controller automatically adjusts resistance based on internal temperature readings, making the system self-regulating without requiring external temperature sensors or manual intervention, thus reducing overall device complexity while maintaining stability
2Adaptability or versatility
If external resistors are used to select resistance magnitude and coefficient, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the approach from relying on precise fixed resistor values to using the active resistance controller's ability to dynamically adjust resistance parameters. The controller can vary resistance magnitude and temperature coefficient through control signals, allowing external resistors to serve as coarse-setting elements while the active controller provides fine-tuning, thereby reducing the stringency of resistor tolerance requirements and maintaining adaptability
Solution Approach 2:
The system transitions from static resistor selection to dynamic resistance adjustment. The active resistance controller continuously adapts the resistance value based on operating conditions, allowing the use of less precise external resistors since the active controller compensates for initial resistor variations. This dynamic adjustment capability maintains selection flexibility while relaxing manufacturing precision constraints
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
The solution effectively compensates for temperature-induced changes in electronic circuits, maintaining consistent performance and functionality across different temperatures, enhancing reliability in temperature-sensitive applications.
Implementation Method 1
A circuit with an active resistance controller that adjusts an adjustable resistance using a proportional to absolute temperature (PTAT) source and temperature-stable source
Data Source
AI summary
In an embodiment a circuit provides an active resistance that is adjusted with temperature, the active resistance has a magnitude and temperature coefficient that is selected by the values of external resistors. The active resistance is controlled by an active resistance controller that uses a temperature dependent source and a temperature stable source to control adjustment of a first adjustable resistance to maintain correspondence between a temperature dependent parameter and a temperature stable parameter, and adjusts a second adjustable resistance that is part of the active resistance in correspondence with adjustment of the first adjustable resistance.