日: 2026年6月11日

RF Modulator vs Frequency Converter: Key Differences, EVM Impact, LO Leakage and I/Q Imbalance Correction

Are you seeing poor EVM in your satellite upconverter system? The cause might be an overlooked detail in your modulator’s architecture, which is hurting your signal quality and system performance. The main difference is function. A frequency converter simply shifts a signal’s carrier frequency. An RF modulator, like a quadrature modulator, also impresses a baseband signal onto that carrier. This means it actively processes I/Q data, creating unique challenges like LO leakage and I/Q imbalance.1 I’ve spent a lot of time in the lab trying to pinpoint strange performance issues. Often, the problem isn’t with a single faulty component. It’s about how different components interact. The distinction between a modulator […]