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The Simons Observatory (SO) is an upcoming polarization-sensitive CosmicMicrowave Background (CMB) experiment on the Cerro Toco Plateau (Chile) withlarge overlap with other optical and infrared surveys (e.g., DESI, LSST, HSC).To enable the readout of \bigO(10,000) detectors in each of the four telescopesof SO, we will employ the microwave SQUID multiplexing technology. With atargeted multiplexing factor of \bigO{(1,000)}, microwave SQUID multiplexinghas never been deployed on the scale needed for SO. Here we present the designof the cryogenic coaxial cable and RF component chain that connects roomtemperature readout electronics to superconducting resonators that are coupledto Transition Edge Sensor bolometers operating at sub-Kelvin temperatures. Wedescribe design considerations including cryogenic RF component selection,system linearity, noise, and thermal power dissipation.

Simons Observatory Microwave SQUID Multiplexing Readout -- Cryogenic RF Amplifier and Coaxial Chain Design