FM Transmitter Power Feedback for Interference Limit Control
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Solution Overview
Problem
FM transmitters used in mobile devices often exceed regulatory power limits when accessories are connected, leading to potential interference with FM broadcast stations and other telecommunication systems, necessitating a method to adjust output power levels based on measured radio signal power.
Innovation Solution
A radio transmitter with an adjustable output power level, featuring a measurement circuit to assess radio signal power and a control block that reduces the power level if it exceeds predefined limits, incorporating a timer circuit for interval measurements and data storage for comparative analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output power level of the FM transmitter is increased to improve signal transmission range and quality, then the signal strength is improved, but the transmitter may exceed regulatory power limits and cause interference with FM broadcast stations and other telecommunication systems
Solution Approach 1:
The patent implements a feedback mechanism where the output power level is continuously measured by a measurement circuit and the measured value is fed back to a control block. The control block compares the measured power level against a predefined limit and automatically adjusts the output power accordingly, ensuring regulatory compliance while maintaining optimal transmission performance.
Solution Approach 2:
The patent dynamically changes the output power parameter based on measured conditions. The control block adjusts the power level parameter in real-time according to the measured radio signal power, transitioning between different power states to balance transmission quality with regulatory compliance.
2Object-affected harmful factors
If the output power level is dynamically adjusted based on measured radio signal power to ensure regulatory compliance, then interference is prevented, but the device complexity increases due to additional measurement and control circuits
Solution Approach 1:
The FM transmitter performs self-monitoring and self-adjustment of its output power level. The measurement circuit continuously measures the transmitter's own output signal, and the control block automatically adjusts the power level without external intervention, enabling the system to regulate itself and maintain compliance.
Solution Approach 2:
The patent combines the measurement circuit and control block functions within an integrated control unit that is part of the existing transmitter architecture. This merging approach minimizes additional complexity by utilizing shared components and integrated circuits rather than adding completely separate systems.
Data Source
AI summary
According to one exemplary embodiment of the present invention, an apparatus is provided comprising a radio transmitter having an output stage with an adjustable output power level, a measurement circuit configured to measure a radio signal power of the radio transmitter and a control block connected to the measurement circuit wherein the measurement circuit is connected to the output stage of the radio transmitter where the radio signal power is measured; and wherein the control block is configured to adjust the output power level of the radio transmitter based on the measured radio signal power at the radio transmitter output stage.