Josephson-Based Full Digital Bridge for High-Accuracy Impedance Comparisons

Area of Science:

• Electrical Metrology
• Quantum Electrical Standards

Background:

• Accurate impedance calibration is crucial for electrical metrology.
• Existing impedance bridges have limitations in range and flexibility.
• National Metrology Institutes require reliable impedance scale maintenance.

Purpose of the Study:

• To introduce a novel Josephson-based digital impedance bridge.
• To demonstrate its capability for comparing diverse impedance types (R-C, R-L, L-C).
• To highlight its broad frequency range (1 kHz to 20 kHz) and flexibility.

Main Methods:

• Utilizing two Josephson arbitrary waveform synthesizer systems.
• Developing a full digital impedance bridge architecture.
• Implementing arbitrary ratio and phase angle comparison capabilities.

Main Results:

• The bridge successfully compares any two impedances across the complex plane.
• Unprecedented flexibility in high-precision impedance calibration is achieved.
• A wide frequency range from 1 kHz to 20 kHz is covered.

Conclusions:

• This Josephson-based bridge offers a versatile solution for impedance calibration.
• It simplifies the realization and maintenance of impedance scales globally.
• The technology promises significant advancements for National Metrology Institutes.