A Cryogenic Bandgap Reference Based on Vertical PNP Transistor for Quantum Computing

Bandgap reference can provide a stable reference voltage for interface circuits of quantum computers at deepcryogenic temperatures. This paper presents a cryogenic bandgap reference (BGR) circuit in the HHGrace 0.35 μm BCD process that exploits the vertical PNP (VPNP). It is the first demonstration of the stable operating BGR based on standard VPNP transistors in the 4K cryogenic environment. And the measured results show that the reference voltage varies by only 1.2% between 4K and 300K, which exhibits a high level of consistency between cryogenic and room temperatures.