An Integrated Phase Noise Generator for Sensitivity Measurements on Superconducting Qubits

F. Herzel, G. Fischer, C. Carta (IHP Frankfurt (Oder), Germany)

A fully integrated phase noise generator for sensitivity measurements is presented. It is based on a charge pump phase-locked loop (CP-PLL) design with controllable loop parameters. Bandpass-shaped phase noise spectra with controllable peak frequency and phase noise power can be generated. Based on a second-order PLL model and simple stochastic differential equations, phase noise models in frequency and time domain are derived. As an illustration, a 3.5 GHz CP-PLL designed in a 130 nm BiCMOS technology is simulated with different control parameters for phase noise shaping. The approach lends itself to sensitivity measurements of superconducting qubits for quantum computers and for modeling such systems