Abstract

This letter describes the design and implementation of a wideband radio frequency-baseband multiplexer. This device makes it possible to superimpose radio frequency noise to a functional baseband signal with controlled and repeatable transfer characteristics. The baseband path has a measured dc—380 $\mathrm{M}$ $\mathrm{Hz}$ bandwidth, while the radio frequency path (up to 1 $\mathrm{W}$ ) has a 150 $\mathrm{k}$ $\mathrm{Hz}$ $\text{-}$ 5 $\mathrm{G}$ $\mathrm{Hz}$ bandwidth. This multiplexer can be used for electromagnetic conducted immunity testing of digital and mixed-signal devices.

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