Phase-Controlled Amplifier Combining for IMD Suppression
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Solution Overview
Problem
Conventional amplifiers for fifth or sixth generation mobile communication base stations face challenges in reducing intermodulation distortion while maintaining efficient operation, as existing methods compromise the power of the fundamental wave signal to suppress intermodulation distortion, leading to inefficient performance.
Innovation Solution
A low distortion amplifier configuration that includes two signal sources and amplifiers, with a combiner operating in a mode where the phase differences between the input signals to each amplifier satisfy specific relational equations, ensuring intermodulation distortion components are in opposite phases, thereby allowing for effective suppression without significantly deteriorating the fundamental wave signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If signals with amplitude difference are input to two amplifiers to suppress intermodulation distortion, then intermodulation distortion is reduced, but fundamental wave signal power is largely lost
Solution Approach 1:
The patent changes the phase parameters of input signals to satisfy specific relational equations, making intermodulation distortion components from two amplifiers opposite in phase while maintaining fundamental wave signals in same phase. This parameter transformation enables selective cancellation of distortion without losing fundamental signal power.
Solution Approach 2:
The patent converts the harmful intermodulation distortion components into a beneficial cancellation mechanism by controlling phase relationships. The distortion components from two amplifiers are made opposite in phase so they cancel each other, while fundamental wave signals remain in phase and reinforce each other.
2Object-generated harmful factors
If conventional distortion compensation is applied to wide band combining low and high frequency sides, then intermodulation distortion is suppressed, but the band width exceeds general transceiver capability
Solution Approach 1:
The patent segments the signal processing into two parallel paths with separate amplifiers, each handling signals with specific phase relationships. This segmentation allows independent control of phase parameters for each path, enabling distortion cancellation across wide bands without requiring the entire system to handle excessive bandwidth.
Data Source
AI summary
An amplifier includes: a first signal source that outputs a first and a second frequency signals; a second signal source that outputs the first and the second frequency signals; a first amplifier that receives and amplifies the signal output from the first signal source; a second amplifier that receives and amplifies the signal output from the second signal source; and an output combiner that combines the signals amplified by the first amplifier and the second amplifier, and operates so that a phase difference between the first frequency signals input to the first and the second amplifier amplifiers and that between the second frequency signals input to the first and the second amplifiers satisfy a relational equation in which intermodulation distortion components of those are in opposite phases.