Wireless Device Transmit Power Control via Directional Coupler Feedback
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Solution Overview
Problem
Existing wireless devices face challenges in effectively controlling transmit power and optimizing antenna tuning networks, which affects their performance across various wireless communication systems.
Innovation Solution
The implementation of a directional coupler and detector system that measures RF signal power levels and adjusts the antenna tuning network to achieve optimal power matching and impedance, using a control module to determine target power levels and adjust amplifier gains and antenna settings for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to improve communication range and signal quality, then data transmission quality is improved, but energy consumption increases and may cause interference
Solution Approach 1:
The patent implements a feedback mechanism where the detector monitors the RF signal power level after amplification and feeds this information back to the controller. The controller adjusts the amplifier gain based on this feedback to maintain the desired output power level, thereby optimizing energy consumption while ensuring reliable data transmission.
Solution Approach 2:
The system dynamically changes the amplifier gain parameter based on detected signal conditions and desired output power requirements. By adjusting this parameter in real-time, the system achieves optimal balance between transmission quality and energy consumption across varying operating conditions.
2Loss of energy
If antenna tuning network is adjusted to optimize impedance matching, then power delivery efficiency is improved, but device complexity increases
Solution Approach 1:
The antenna tuning network is configured to automatically adjust its impedance matching parameters based on signals from the detector and controller, without requiring manual intervention. This self-adjusting capability optimizes power delivery efficiency while minimizing the need for complex manual tuning mechanisms.
Solution Approach 2:
The antenna tuning network is designed to perform multiple functions including impedance matching, power optimization, and adaptive tuning across different operating conditions. This multi-functionality reduces the need for separate dedicated components for each function, thereby managing device complexity while maintaining high power delivery efficiency.
3Power
If amplifier gain is increased to achieve desired output power, then transmit power is improved, but signal distortion increases and power consumption increases
Solution Approach 1:
The detector monitors the amplified RF signal power level and provides feedback to the controller. The controller uses this feedback to precisely control the amplifier gain, increasing it only to the extent necessary to achieve the desired output power level without causing signal distortion or excessive power consumption.
Solution Approach 2:
The amplifier gain is dynamically adjusted based on real-time feedback from the detector rather than being fixed. This dynamic control allows the system to optimize output power while avoiding signal distortion by preventing over-amplification, thereby maintaining signal quality across varying operating conditions.
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 solution enables precise control of transmit power and antenna tuning, enhancing the wireless device's performance by ensuring efficient power delivery and impedance matching, thereby improving data transmission and reception quality.
Implementation Method 1
a directional coupler may receive an input RF signal at a first port, may provide an output RF signal at a second port, and may provide a reflected RF signal at a fourth port
Implementation Method 2
at least one detector may be coupled to the directional coupler and may receive at least one RF signal on at least one port of the directional coupler. The at least one detector may measure the at least one RF signal and may provide measurements
Data Source
AI summary
Techniques for controlling transmit power and adjusting an antenna tuning network of a wireless device are disclosed. In an exemplary design, an apparatus (e.g., a wireless device or a circuit module) includes a directional coupler and at least one detector. The directional coupler receives an input radio frequency (RF) signal at a first port, provides an output RF signal at a second port, and provides a coupled RF signal at a third port. The detector(s) receive at least one RF signal on at least one port of the directional coupler, measure the at least one RF signal, and provide measurements that are used to control the transmit power of the wireless device and adjust an antenna tuning network. For example, the measurements may be used to determine incident power, reflected power, delivered power, etc., which may be used to control the transmit power and/or adjust the antenna tuning network.