Analog-to-Digital Converter Based on Voltage-Controlled Superconducting Devices

The conventional approach to quantum processor control relies on transmitting signals across a significant temperature gradient - from milli-kelvin cryogenic environments to room-temperature CMOS electronics. This transition introduces thermal noise, latency, and signal degradation, posing fundamental limitations on scalability and fidelity. To address these challenges, this work explores the development of a next-generation quantum control platform leveraging quantum-enhanced Josephson Junction Field-Effect Transistors (JJFETs). These devices are specifically engineered for cryogenic operation and offer ultra-low power dissipation, making them inherently compatible with superconducting quantum systems. In this study, we develop and simulate core digital and mixed-signal components - including logic gates, comparator circuits, and a custom 3-bit flash Analog-to-Digital Converter (ADC) based entirely on a Verilog-A calibrated JJFET model. The JJFET-based ADC integrates low-power comparator blocks, and a custom thermometer-to-binary priority encoder designed using voltage-controlled logic topologies. These building blocks enable high-speed, low-noise signal conversion and are optimized for integration with quantum measurement chains. The results lay the groundwork for scalable, low-latency cryogenic control systems, paving the way for future integration of additional digital and mixed-signal elements such as DACs and multiplexers to enable full-stack, cryo-compatible classical control infrastructure.