Transmitter Gain Control Using Voltage Feedback to Protect Power Amplifiers
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Solution Overview
Problem
Existing wireless communication systems face issues where signal strength can exceed acceptable limits, potentially damaging power amplifiers in transmitters.
Innovation Solution
A transmitter design incorporating an analog transmission circuit, power amplifier, voltage detector, comparator, and control circuit to dynamically adjust gains based on voltage, power, and temperature levels to prevent excessive signal energy from reaching the power amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal strength is increased to improve communication quality, then the communication quality is improved, but the power amplifier may be damaged due to excessive energy
Solution Approach 1:
The patent applies preliminary action by detecting the voltage level of the second analog signal before it reaches the power amplifier. The control circuit proactively adjusts the first gain based on this detection, preventing excessive energy from reaching the power amplifier before damage can occur. This is embodied in the voltage detector that monitors the signal and the control circuit that adjusts gain in advance.
Solution Approach 2:
The patent implements feedback by using the voltage detector to continuously monitor the voltage level of the second analog signal and feeding this information back to the control circuit. The control circuit then adjusts the first gain based on this feedback, creating a closed-loop control system that maintains signal strength within safe limits while optimizing communication quality.
2Power
If the gain is increased to enhance signal strength, then the signal strength is improved, but the signal power may exceed acceptable ranges causing apparatus damage
Solution Approach 1:
The patent applies dynamics by making the first gain adjustable rather than fixed. The control circuit dynamically changes the first gain based on real-time voltage level detection, allowing the system to optimize signal strength while preventing excessive power. This is achieved through the variable gain control in the analog transmission circuit.
Solution Approach 2:
The patent implements parameter changes by modifying the first gain parameter based on detected voltage levels. When the voltage level indicates potentially dangerous signal strength, the control circuit changes the first gain parameter to reduce power. This dynamic parameter adjustment allows the system to maintain high signal strength when safe and reduce it when necessary to prevent damage.
Data Source
AI summary
A transmitter includes an analog transmission circuit, a power amplifier, a voltage detector, a comparator, and a control circuit. The analog transmission circuit is configured to provide a first gain to a first analog signal, so as to generate a second analog signal. The power amplifier is configured to provide a second gain to the second analog signal, so as to generate an output signal to an antenna. The voltage detector is configured to detect a voltage level of the second analog signal. The comparator is configured to generate an indication signal according to the voltage level and a reference level. The control circuit is configured to adjust the first gain of the analog transmission circuit according to the indication signal.