2025/02/06 by Nan Li, Li, Nan, Ren, Xiang-xiang +23
Engineering · Computer Science · #Analog and Mixed-Signal Circuit Design #Advancements in PLL and VCO Technologies #Quantum Computing Algorithms and Architecture
paper · pdf · doi:10.48550/arxiv.2502.03977
A superconducting quantum interference device (SQUID), functioning as a nonlinear response device, typically requires the incorporation of a flux-locked loop (FLL) circuit to facilitate linear amplification of the current signal transmitted through a superconducting transition-edge sensor (TES) across a large dynamic range.This work presents a reasonable model of the SQUID-FLL readout system, based on a digital proportional-integral-differential (PID) flux negative feedback algorithm.This work investigates the effect of V-ϕ shape on the performance of digital FLL circuits.Such as the impact factors of bandwidth, design limits of slew rate of the system and the influence of the shapes of SQUID V-ϕ curve.Furthermore, the dynamic response of the system to X-ray pulse signals with rise time ranging from 4.4∼281 μs and amplitudes ranging from 6∼8 ϕ0 was simulated.All the simulation results were found to be consistent with the existing mature theories, thereby validating the accuracy of the model.The results also provide a reliable modelling reference for the design of digital PID flux negative feedback and multiplexing SQUID readout electronic systems.