Radio-Frequency Circuit Phase Control for Stable Transmission
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Solution Overview
Problem
Existing radio-frequency circuits experience fluctuations in transmission characteristics due to load variations, which affect the performance of mobile devices.
Innovation Solution
The radio-frequency circuit incorporates a splitter to split a fundamental signal into two signals with a 90° phase difference, power amplifiers to amplify these signals, and phase shifter circuits to control the phase of fundamental and harmonic waves, ensuring a 180° reflection phase difference between output ports to mitigate fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power amplifier configurations are used, then device complexity is reduced, but transmission characteristics fluctuate due to load variations
Solution Approach 1:
The circuit is divided into two separate signal paths, each with its own power amplifier, phase shifter, and harmonic phase shifter. This segmentation allows independent control of each path to maintain 180° phase difference and suppress transmission characteristic fluctuations caused by load variations
Solution Approach 2:
Phase shifters and harmonic phase shifters are introduced as intermediary components between the power amplifiers and the combining point. These intermediaries actively adjust the phase of fundamental waves and harmonic waves to maintain the required 180° phase difference, thereby stabilizing transmission characteristics
2Reliability
If phase shifter circuits are added to control fundamental and harmonic waves, then transmission characteristics are stabilized, but device complexity increases
Solution Approach 1:
Different phase shifter circuits are designed with specific local functions: one for controlling fundamental wave phase and another for controlling harmonic wave phase. Each phase shifter is optimized for its specific frequency range, allowing precise local control of phase characteristics to stabilize transmission properties
Solution Approach 2:
The phase shifter circuits are designed to dynamically adjust phase shifts based on operating conditions. The harmonic phase shifter specifically adapts to maintain 180° phase difference between fundamental and harmonic waves, enabling the system to respond to load variations and maintain stable transmission characteristics
Data Source
AI summary
A radio-frequency circuit 1 includes a power amplifier configured to receive a first signal, a power amplifier configured to receive a second signal that is +90° relative to the first signal, a combiner circuit configured to combine in phase a third signal input from a fourth input port and a fourth signal input from a fifth input port, a phase shifter circuit coupled to a third output port of the power amplifier, a phase shifter circuit coupled to a fourth output port of the power amplifier, the forward phase of a fundamental wave in the phase shifter circuit being −90° relative to the phase shifter circuit, a harmonic phase shifter circuit coupled to the third output port, and a harmonic phase shifter circuit coupled to the fourth output port.