Signal Compensation Loop Gain for PA Distortion Linearization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power amplifiers in wireless transceivers suffer from amplitude modulation to amplitude modulation (AM-AM) and amplitude modulation to phase modulation (AM-PM) distortions, leading to spectral regeneration and reduced transmitter performance, which complicates integration and increases costs.
Innovation Solution
A signal compensation device incorporating a modulation circuit that generates a control signal to provide loop gain, linearizing the emitter and receiver by compensating for signal attenuation through a sigma-delta modulation circuit, reducing computational complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If many signal compensation methods are used to correct AM-AM and AM-PM distortions, then transmitter performance is improved, but cost and design complexity increase
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects the transmitted signal and feeds back information about AM-AM and AM-PM distortions to the transmitter. The transmitter then adjusts its signal based on this feedback, creating a closed-loop system that automatically compensates for distortions without requiring complex external compensation circuits.
Solution Approach 2:
The patent combines the signal compensation function with the existing transmitter and receiver structures by integrating distortion detection and correction capabilities into the normal communication signal flow. This merging approach eliminates the need for separate, complex compensation devices while maintaining performance improvements.
2Object-generated harmful factors
If complex signal compensation methods are implemented, then spectral regeneration is reduced, but computational complexity increases
Solution Approach 1:
The feedback mechanism enables real-time detection and correction of spectral regeneration issues. The receiver measures spectral distortion and communicates this information back to the transmitter, which then adjusts its modulation and amplification parameters to minimize spectral regeneration, achieving effective suppression with simple computational operations.
Solution Approach 2:
The system performs preliminary distortion characterization during the feedback process and uses this pre-analyzed information to guide compensation actions. By pre-processing the distortion measurements and preparing correction parameters in advance, the system reduces the computational burden during active transmission while still effectively suppressing spectral regeneration.
Data Source
AI summary
A signal compensation device is disclosed. The signal compensation device includes an operation circuit and a modulation circuit. The operation circuit is configured to generate a control signal according to a first data signal and a second data signal, in which the second data signal is generated according to the first data signal by a signal conversion circuit. The modulation circuit is configured to provide a loop gain according to the control signal to compensate an attenuation of the signal conversion circuit.