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Josephson Junction Digital to Analog Converter for Accurate AC Waveform Synthesis
Patent Number: 5,812,078
In metrology applications, primary standards for AC voltage rely on thermal voltage converters that compare the heating effect of AC and DC inputs. Direct waveform synthesis from an accurate AC voltage source is needed. It would provide the first independent check of the accuracy of thermal voltage converters and change the fundamental method of AC metrology from detector-based to source-based calibrations.
Invention
This invention provides a low-phase noise digital to analog converter utilizing Josephson junctions in connection with the first programmable voltage standards for metrologically accurate waveform synthesis and cryogenic radar systems.
Commercial Application
A low noise accurate signal generator for a calibration system or a radar system.
Competitive Advantage
- Provides quantum mechanically accurate voltage pulses.
- Improves detection of targets in clutter, which would otherwise not be detected.