Open-Loop Temperature Compensation Circuit for Stable RF Output
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Solution Overview
Problem
Conventional RF output circuits with closed loop designs are expensive and complex, making them unsuitable for low-cost products, and they require a more cost-effective and simpler solution for temperature compensation.
Innovation Solution
An open loop temperature compensation circuit using a thermistor, compensation capacitor, and compensation diode, where the thermistor's impedance variation with temperature inversely matches the gain variation of the processing circuit, stabilizing the output without feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed loop circuit design is used for temperature compensation, then the output stability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the feedback control mechanism from the temperature compensation circuit, transitioning from a closed-loop design to an open-loop design. By removing the feedback path while retaining the essential temperature compensation function through direct coupling of the thermistor, the circuit achieves output stability without the complexity and cost of closed-loop control components
Solution Approach 2:
The patent replaces expensive and complex closed-loop control components with inexpensive open-loop components including a thermistor, capacitor, and diode. This substitution maintains adequate temperature compensation functionality while dramatically reducing circuit complexity and cost, making the solution suitable for low-price products
2Reliability
If a closed loop circuit design is used for temperature compensation, then the output stability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent removes the feedback control infrastructure from the temperature compensation circuit, eliminating expensive components and assembly steps associated with closed-loop designs. The resulting open-loop circuit uses minimal components that are cheaper to manufacture and assemble, while still providing sufficient output stability for the application
Solution Approach 2:
The patent substitutes costly closed-loop control components with inexpensive open-loop components such as a thermistor, capacitor, and diode. This component substitution significantly reduces bill of materials cost and manufacturing complexity, enabling deployment in cost-sensitive low-price products while maintaining acceptable performance
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 open loop circuit effectively stabilizes the electronic device's output while being low in cost and complexity, ensuring temperature compensation without the need for expensive and complex closed loop designs.
Implementation Method 1
The impedance of the thermistor varies with temperature so as to compensate and stabilize an output of the processing circuit. A rate of change of the Impedance of the thermistor with respect to temperature is inversely proportional to a rate of change of gain of the processing circuit with respect to temperature.
Data Source
AI summary
A temperature compensation circuit is adapted to be used in an electronic device including a processing circuit. The temperature compensation circuit includes a thermistor, a compensation capacitor and a compensation diode. The thermistor has two ends, one of which is adapted to be electrically connected to the processing circuit. The compensation capacitor has two ends, one of which is electrically connected to the other one of the two ends of the thermistor. The compensation diode has an anode electrically connected to the other one of the two ends of the compensation capacitor, and a cathode to be grounded. The impedance of the thermistor varies with temperature so as to compensate and stabilize an output of the electronic device.