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Large arrays of cryogenic sensors for various imaging applications rangingacross x-ray, gamma-ray, Cosmic Microwave Background (CMB), mm/sub-mm, as wellas particle detection increasingly rely on superconducting microresonators forhigh multiplexing factors. These microresonators take the form of microwaveSQUIDs that couple to Transition-Edge Sensors (TES) or Microwave KineticInductance Detectors (MKIDs). In principle, such arrays can be read out withvastly scalable software-defined radio using suitable FPGAs, ADCs and DACs. Inthis work, we share plans and show initial results for SLAC MicroresonatorRadio Frequency (SMuRF) electronics, a next-generation control and readoutsystem for superconducting microresonators. SMuRF electronics are unique intheir implementation of specialized algorithms for closed-loop tone tracking,which consists of fast feedback and feedforward to each resonator's excitationparameters based on transmission measurements. Closed-loop tone trackingenables improved system linearity, a significant increase in sensor count perreadout line, and the possibility of overcoupled resonator designs for enhanceddynamic range. Low-bandwidth prototype electronics were used to demonstrateclosed-loop tone tracking on twelve 300-kHz-wide microwave SQUID resonators,spaced at $\sim$6 MHz with center frequencies $\sim$5-6 GHz. We achievemulti-kHz tracking bandwidth and demonstrate that the noise floor of theelectronics is subdominant to the noise intrinsic in the multiplexer.

SLAC Microresonator Radio Frequency (SMuRF) Electronics for Read Out of Frequency-Division-Multiplexed Cryogenic Sensors