Biasing and Demodulation Firmware for Kilopixel TES Bolometer Arrays

We describe the signal-processing firmware and software for a frequency-domain multiplexed (FDM) biasing and demodulation system that reads out Transition Edge Sensor (TES) bolometer arrays for mm-wavelength cosmology telescopes. This system replaces a mixed-signal readout backend with a much smaller, more power-efficient system relying on Field-Programmable Gate Arrays (FPGAs) for control, computation and signal processing. The new system is sufficiently robust, automated, and power efficient to be flown on stratospheric balloon-borne telescopes and is being further developed for satellite applications.