Tunable Antenna Matching Circuit Power Control Loop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In RF communications systems, impedance mismatches between RF power amplifiers and antennas cause reflections, reducing delivered power and leading to instability in output power adjustments due to interactions between separate control loops for tunable antenna matching and RF power amplifier adjustments.
Innovation Solution
Combining tunable antenna matching circuit adjustments and RF power amplifier output power adjustments within a single control loop, particularly at slot boundaries during full duplex operations and low amplitude portions of amplitude modulated RF output signals, to maintain spectral purity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate control loops are used for tunable antenna matching circuit adjustments and RF power amplifier output power adjustments, then each control loop can operate independently, but instabilities occur due to interactions between the two control loops
Solution Approach 1:
The patent merges the tunable antenna matching circuit adjustments and RF power amplifier output power adjustments into a single integrated control loop. This eliminates the instability caused by interactions between separate control loops while maintaining the ability to independently adjust both parameters through coordinated control within the unified loop structure.
2Reliability
If tunable antenna matching circuit adjustments are made continuously, then impedance matching is optimized, but disruptions occur to RF output signals during full duplex operations and amplitude modulated transmissions
Solution Approach 1:
The patent implements periodic action by making tunable antenna matching circuit adjustments only at slot boundaries during full duplex operations and during low amplitude portions of amplitude modulated RF output signals. This timing-based approach allows impedance matching optimization to occur periodically without causing continuous disruptions to the RF output signals, thereby resolving the contradiction between matching optimization and signal disruption.
Data Source
AI summary
The present disclosure relates to combining tunable antenna matching circuit adjustments and RF power amplifier output power adjustments of a first RF terminal in response to output power adjustment commands received from a second RF terminal. The output power adjustment commands may be part of an output power control loop between the first RF terminal and the second RF terminal to control the output power from the first RF terminal. The first RF terminal may include an RF receiver, an RF power amplifier, and a tunable antenna matching circuit coupled between an output of the RF power amplifier and an antenna. The tunable antenna matching circuit adjustments may be impedance adjustments of the tunable antenna matching circuit and the RF power amplifier output power adjustments may result from adjustments to one or more input signals to the RF power amplifier.