Dual-Path Low Distortion Amplifier for IMD Suppression
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Solution Overview
Problem
Conventional amplifiers face issues with intermodulation distortion, leading to power loss in fundamental wave signals and inefficient operation, as the ratio of intermodulation distortion suppression is not effectively balanced with fundamental wave deterioration.
Innovation Solution
A low distortion amplifier design that combines signals from two amplifiers with controlled phase differences, ensuring intermodulation distortion components are in opposite phases, using a configuration with first and second signal sources, amplifiers, and a combiner to achieve balanced suppression of intermodulation distortion while maintaining fundamental wave power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If signals are combined from two amplifiers with phase differences to suppress intermodulation distortion, then intermodulation distortion suppression ratio is improved, but fundamental wave signal power is deteriorated
Solution Approach 1:
The input signal is divided into two separate paths, each processed by a different amplifier with distinct phase relationships. The first amplifier receives signals with a first phase difference between frequency components, while the second amplifier receives signals with a second phase difference. This segmentation allows independent control of phase relationships to suppress intermodulation distortion while preserving fundamental wave power.
Solution Approach 2:
Different phase relationships are applied to different frequency components within the signal. The first phase difference is applied to the first frequency component, and the second phase difference is applied to the second frequency component. This local differentiation of phase quality enables selective suppression of intermodulation distortion products while maintaining the integrity of fundamental wave signals.
2Object-generated harmful factors
If conventional phase difference methods are used to reduce intermodulation distortion, then intermodulation distortion power is reduced, but fundamental wave signal power is largely lost
Solution Approach 1:
The invention changes the phase parameter relationships between different frequency components in a controlled manner. By setting specific phase differences for different frequency components rather than applying a uniform phase shift, the system achieves intermodulation distortion suppression while minimizing fundamental wave power loss. The first and second phase differences are carefully selected to target distortion products without affecting fundamental signals.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An amplifier (1) includes: a first signal source (2) that outputs a first frequency signal and a second frequency signal; a second signal source (3) that outputs the first frequency signal and the second frequency signal; a first amplifier (4) that receives the signal output from the first signal source (2) and amplifies the input signal; a second amplifier (5) that receives the signal output from the second signal source (3) and amplifies the input signal; and an output combiner (6) that combines the signal amplified by the first amplifier (4) and the signal amplified by the second amplifier (5), and operates in an operation mode in which a phase difference between the first frequency signals input to the first amplifier (4) and the second amplifier (5) and a phase difference between the second frequency signals input to the first amplifier (4) and the second amplifier (5) satisfy a relational equation in which an intermodulation distortion component included in the signal amplified by the first amplifier (4) and an intermodulation distortion component included in the signal amplified by the second amplifier (5) are in opposite phases.