I/Q Transceiver Distortion Reduction via Feedback Correction
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Solution Overview
Problem
Cartesian transceivers, particularly I/Q transceivers, are susceptible to amplitude and phase mismatch (I/Q mismatch) and oscillator phase and frequency leakage, leading to distortion of modulated carrier signals and data transmission.
Innovation Solution
An electronic device with a transceiver that measures energy components of zero intermediate frequency (ZIF) signals representing I/Q mismatch and local oscillator (LO) leakage, generates correction factors based on this energy, and applies these factors to reduce or eliminate distortion in the electromagnetic signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If I/Q transceivers are used for ease of modulation, then modulation ease is improved, but signal distortion increases due to I/Q mismatch and LO leakage
Solution Approach 1:
The patent implements a feedback mechanism where the transceiver measures the energy of distortion components in the transmitted signal and uses this information to generate correction factors. These correction factors are applied to adjust the I/Q modulation parameters, creating a closed-loop system that continuously reduces distortion while maintaining modulation simplicity.
Solution Approach 2:
The patent dynamically changes modulation parameters (I/Q amplitude and phase) based on measured distortion energy. By adjusting these parameters in real-time according to the measured distortion levels, the system optimizes signal quality without sacrificing the ease of I/Q modulation operation.
2Object-affected harmful factors
If correction factors are applied to reduce distortion, then signal quality is improved, but device complexity increases
Solution Approach 1:
The transceiver performs self-correction by measuring its own distortion and generating its own correction factors without requiring external calibration equipment or complex manual adjustment mechanisms. This self-service approach reduces overall system complexity while maintaining signal quality.
Solution Approach 2:
The patent uses parameter changes to simplify the correction process by focusing on adjusting only the essential I/Q modulation parameters (amplitude and phase) rather than redesigning the entire transceiver architecture. This targeted parameter adjustment reduces complexity compared to comprehensive system redesign.
Data Source
AI summary
Devices and methods for reducing or substantially eliminating I/Q mismatch and/or LO leakage in I/Q transceivers are provided. By way of example, an electronic device includes a transceiver configured to receive an in-phase/quadrature (I/Q) signal, and to generate an electromagnetic signal based on the I/Q signal. However, the electromagnetic signal may also include a distortion. Accordingly, the transceiver is also configured to receive a feedback signal based on the electromagnetic signal, measure an energy of the distortion by way of the feedback signal, and to generate one or more correction factors based at least in part on the energy of the distortion. The one or more correction factors may be utilized to reduce or substantially eliminate the distortion of the electromagnetic signal.