Predistortion Circuit Split Updates for Fast Amplifier Drift
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Amplifiers, particularly compound semiconductor amplifiers like GaN amplifiers, experience instantaneous changes in distortion due to Idq drift, which traditional distortion compensation methods struggle to address efficiently due to high processing loads associated with frequent updates of distortion compensation characteristics.
Innovation Solution
A dual-distortion compensation approach is implemented, using a first distortion compensation circuit for non-linear and memory effect distortions, and a second circuit for quicker temporal changes, with the update unit updating the second distortion compensation characteristic at a higher frequency than the first, allowing for real-time adaptation without excessive processing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional distortion compensation methods are used to address instantaneous changes in distortion due to Idq drift, then distortion compensation accuracy is improved, but processing load increases excessively
Solution Approach 1:
The patent segments distortion compensation into two distinct circuits: a first distortion compensation circuit that processes non-linear and memory effect distortions at a lower update frequency, and a second distortion compensation circuit that processes instantaneous distortion changes at a higher update frequency. This segmentation allows each circuit to be optimized for its specific function, enabling accurate tracking of rapid distortion changes while maintaining manageable processing loads through specialized division of labor.
2Measurement precision
If update frequency of distortion compensation characteristic is increased to track rapid changes, then distortion compensation accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent divides the distortion compensation system into two specialized circuits with different update frequencies. The first circuit handles non-linear and memory effect distortions with slower updates, while the second circuit handles instantaneous changes with faster updates. This segmentation reduces processing complexity by assigning specific update rate requirements to dedicated circuits rather than requiring a single complex system to handle all distortion types at the highest update frequency.
Solution Approach 2:
The patent implements dynamic update frequencies for different distortion compensation circuits. The second distortion compensation circuit operates at a higher update frequency to track rapid instantaneous changes, while the first circuit uses a lower update frequency for more stable distortion components. This dynamic approach allows the system to adapt its processing complexity to the actual distortion characteristics, reducing unnecessary computational overhead while maintaining accuracy where needed.
Data Source
AI summary
A distortion compensation device includes: a first distortion compensation circuit having a first distortion compensation characteristic for compensating for a first distortion occurring in an output of an amplifier, the first distortion compensation circuit being configured to compensate for the first distortion; a second distortion compensation circuit having a second distortion compensation characteristic for compensating for a second distortion occurring in the output of the amplifier, the second distortion compensation circuit being configured to compensate for the second distortion; and an update unit configured to update the second distortion compensation characteristic. The first distortion includes a non-linear distortion and a memory effect distortion, the second distortion is a distortion whose temporal change is quicker than the first distortion, and the update unit updates the second distortion compensation characteristic at a higher frequency than an update frequency of the first distortion compensation characteristic.