Speakers
Description
To meet the electronic readout requirements of Transition Edge Sensor (TES) arrays in the Ali CMB Polarization Telescope (AliCPT) experiment, under conditions of high channel count, wide bandwidth, high-speed readout, and long-term stability, a Microwave Superconducting Quantum Interference Device (SQUID) Multiplexer (μMUX) readout electronics system has been designed and implemented. The system is composed of a control board, a Radio Frequency (RF) board, and the ZCU111 development board, covering a continuous readout bandwidth of 0 to 4.096 GHz. It enables excitation, up-down frequency conversion, digitization, and real-time processing of μMUX resonator arrays. The system achieves up-down frequency conversion and amplitude adjustment of RF signals through the RF board. The high-speed DACs and ADCs integrated on the ZCU111 development board are responsible for generating and collecting a comb of probe tones, and the FPGA implements digital down frequency conversion, channelization and signal demodulation. The readout signals are channelized into independent 2 MHz-bandwidth using the Polyphase Filter Bank (PFB), enabling parallel readout of multiple resonators. Based on the complete electronic readout chain, noise analysis is performed on the system output, evaluating the power spectral density characteristics and the level of electronic noise of the signals after channelization. These results provide experimental evidence for performance optimization of the μMUX readout system and the application of large-scale TES arrays.
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