Compact Model of Superconductor-Ferromagnetic Transistors

The superconductor-ferromagnetic transistor (SFT) is a novel cryogenic device with the potential to greatly enhance traditional single flux quantum circuits. Since SFT devices are under active development, compact models are necessary to include this device in the simulation of novel circuits. In this chapter, a simplified compact model of a three-terminal SFT device is described. The model fits the general I-V characteristics of existing devices with 7.4% mean absolute error, while also capturing the transient behavior of the device. The model has been implemented in Verilog-A and simulated in Cadence Spectre. The model enables the simulation of SFQ circuits containing SFT devices and is reconfigurable to support developments in SFT technology.