Dual-Path Distortion Compensation for Asymmetrical Intermodulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional distortion compensation circuits cannot accurately adjust the phase and amplitude of intermodulation distortion in both low and high frequency ranges, leading to asymmetrical characteristics in amplifiers, which results in incomplete compensation of asymmetrical intermodulation distortion.
Innovation Solution
A distortion compensation circuit comprising a distributor, high-pass and low-pass filters, linearizers, phase shifters, and a synthesizer, which individually adjust the phase and amplitude of intermodulation distortion in different frequency ranges by attenuating signals and shifting phases to match the inverse characteristics of the distortion generated in the amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional distortion compensation circuit with a single impedance transformation circuit is used, then the circuit structure is simple, but it cannot accurately compensate asymmetrical intermodulation distortion in both low and high frequency ranges
Solution Approach 1:
The distortion compensation circuit is divided into two independent signal paths: a first path with a high-pass filter for processing low-frequency intermodulation distortion, and a second path with a low-pass filter for processing high-frequency intermodulation distortion. Each path has its own impedance transformation circuit, allowing independent optimization and accurate compensation for asymmetrical distortion characteristics in different frequency ranges without requiring a complex unified structure.
2Adaptability or versatility
If the frequency band of the desired wave is broad, then the amplifier can handle more signals, but asymmetrical intermodulation distortion appears in both low and high frequency ranges that cannot be individually adjusted
Solution Approach 1:
Different frequency components of intermodulation distortion are treated with different circuit characteristics. The high-pass filter path applies impedance transformation optimized for low-frequency distortion, while the low-pass filter path applies impedance transformation optimized for high-frequency distortion. This local optimization allows precise adjustment of distortion characteristics in each frequency range, enabling accurate compensation across the entire broad frequency band.
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 allows for precise compensation of asymmetrical intermodulation distortion in amplifiers by adjusting the phase and amplitude of intermodulation distortion in both low and high frequency ranges, effectively reducing the distortion generated in the amplifier.
Implementation Method 1
a high-pass filter disposed on a first transmission line, having characteristics to attenuate, among input high-frequency waves being two waves, an amplitude of a wave in a low-frequency range by a set value or more with respect to an amplitude of a wave in a high-frequency range
Implementation Method 2
a low-pass filter disposed on a second transmission line, having characteristics to attenuate, among the input high-frequency waves being two waves, an amplitude of a wave in a high-frequency range by a set value or more with respect to an amplitude of a wave in a low-frequency range
Implementation Method 3
a first phase shifter connected to the first linearizer; a second phase shifter connected to the second linearizer
Data Source
AI summary
A distributor distributes an input signal to a first transmission line and a second transmission line. A high-pass filter, a first linearizer, and a first phase shifter disposed on the first transmission line adjust the phase and amplitude of an intermodulation distortion in a low-frequency range. A low-pass filter, a second linearizer, and a second phase shifter disposed on the second transmission line adjust the phase and amplitude of an intermodulation distortion in a high-frequency range. A synthesizer synthesizes the signal from the first transmission line and the signal from the second transmission line.