HIGH-BANDWIDTH ANALOG SQUID SIMULATOR

We describe the design, construction, and performance of an electronic analog of a de SQUID (Superconducting Quantum Interference Device). T his SQUID simulator is characterized by bandwidth exceeding 1.5 MHz an d low noise consistent with the performance of modern de SQUID devices . The flux modulation current to output voltage transfer function and the input and output impedances are similar to those of common SQUID d esigns. We will present results on the performance of this simulator u sed with SQUID control electronics having flux modulation frequencies up to 500 MHz.