IQ Signal Generator Self-Correction Without External Measurement Hardware
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional error suppression techniques for IQ signal generator systems require additional measurement hardware, increasing effort and costs.
Innovation Solution
An integrated method within the IQ signal generator system uses an analysis circuit to determine error quantities from a level curve of the modulated IQ signal, allowing the control circuit to automatically correct errors such as I-offsets, Q-offsets, IQ gain imbalances, and IQ quadrature errors without external measurement devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional error suppression techniques using external measurement devices are employed, then error correction capability is improved, but device complexity and cost increase
Solution Approach 1:
The IQ signal generator system performs self-diagnosis and self-correction by using its own internal resources. The analysis circuit extracts error information from the modulated IQ signal itself, and the control circuit automatically adjusts operational parameters to correct errors, eliminating the need for external measurement devices
Solution Approach 2:
The analysis circuit serves multiple functions: it analyzes the modulated IQ signal to extract error information, determines error quantities, and provides feedback for correction. This multi-functional approach replaces the need for separate external measurement devices while maintaining comprehensive error correction capability
2Measurement precision
If external measurement devices are used for error suppression, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The control circuit receives error information from the analysis circuit and automatically adjusts operational parameters of the baseband circuit and IQ modulator circuit. This closed-loop feedback mechanism eliminates manual measurement and correction efforts while maintaining high measurement precision through automated error quantity determination
Solution Approach 2:
The system automatically performs error measurement and correction without external intervention. The analysis circuit and control circuit work together to autonomously identify errors and adjust parameters, significantly reducing operational effort while maintaining accurate error measurement
Data Source
AI summary
A method of correcting an error in an IQ signal generator system includes: generating, by a baseband circuit, a baseband IQ signal having a baseband I signal part and a baseband Q signal part; modulating, by an IQ modulator circuit, the baseband IQ signal, thereby obtaining a modulated IQ signal; determining, by an analysis circuit, a level curve of the modulated IQ signal, wherein the level curve is associated with a signal level of the modulated IQ signal over time; determining, by the analysis circuit, at least one error quantity based on the level curve, wherein the level curve multiplied with a spectral factor is integrated in order to determine the at least one error quantity; and controlling, by a control circuit, the baseband circuit or the IQ modulator circuit based on the at least one error quantity determined, thereby correcting an error in the IQ signal generator system.