Amplifier Linearization Assembly for Intermodulation Distortion Correction
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Solution Overview
Problem
Conventional signal processing systems, such as amplifiers, exhibit non-linear behavior leading to distortion, particularly intermodulation distortion, which is difficult to filter out and reduces system performance, with existing methods only 'covering' or 'patching' the issue rather than correcting the non-linearity.
Innovation Solution
A system linearization assembly that includes a delay device, attenuation device, computing device, and controller to detect and modify non-linear intermodulation distortion components by comparing the input and output signals, allowing for direct adjustment of amplifier bias voltages to minimize distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional linearization methods (power backoff, pre-distortion, post-distortion) are used, then distortion effects are minimized, but the non-linearity of the amplifier itself is not corrected and amplification efficiency is compromised
Solution Approach 1:
The system uses a feedback mechanism where the output signal is fed back through a delay device and attenuation device to be compared with the input signal. The computing device calculates the difference between these signals to generate a correction signal that is applied to the amplifier bias voltages, continuously adjusting the amplifier to minimize distortion while maintaining efficiency.
Solution Approach 2:
The amplifier system performs self-correction by using its own output signal to generate the correction information. The detection device detects distortion components in the output, and the controller automatically adjusts the bias voltages without requiring external intervention, enabling the system to self-optimize its linearization.
2Object-affected harmful factors
If amplifier bias voltages are adjusted to reduce non-linear distortion, then distortion is minimized, but system complexity increases due to additional control circuitry
Solution Approach 1:
The system combines multiple functions into integrated components: the delay device and attenuation device are merged into a single signal path, the computing device integrates subtraction and correction signal generation, and the controller combines detection and adjustment functions. This reduces overall system complexity while achieving effective distortion minimization.
Data Source
AI summary
A system linearization assembly generally includes a delay device that receives an input signal from a signal source and delays the input signal by a predetermined delay function. An attenuation device receives a modified output signal from a signal modifying device, wherein the output signal is based on the input signal and includes a time varying parameter representing a plurality of frequency components including at least one component caused by non-linear intermodulation distortion. The attenuation device attenuates the output signal by a factor that is equal to at least one parameter of the modifying device. A computing device compares the attenuated output signal with the delayed input signal to obtain a resultant signal that includes the component caused by non-linear intermodulation distortion. A detection device detects at least one parameter of the resultant signal. Based on the detected parameter, a controller facilitates a modification of the component.