For any engineer working with radio frequency (RF) transceivers, a deep understanding of key performance metrics is paramount. One such critical parameter that directly impacts the quality and fidelity of a transmitted or received signal is the Image Rejection Ratio (IRR). It is also frequently referred to as Residual Sideband (RSB) suppression. This metric quantifies the modulator's ability to generate a clean single-sideband signal and suppress the unwanted sideband, or "image." A poor IRR in a transmitter can lead to spectral regrowth, interference with adjacent channels, and a violation of regulatory spectral masks. This blog post will delve into the concept of IRR from a transmitter's perspective, explaining its origin, its importance, and the methods used to analyze and calculate it in modern RF transceivers.

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