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An Optoelectronic Pulse Drive for Quantum Voltage Synthesizer
摘要： An optoelectronic pulse drive system based on commercially available telecoms optoelectronic components and a field-programmable gate array has been developed. In order to allow the use of ac-coupled optoelectronic components, a method of adding and subtracting complementary pulses was developed. The system was used to drive a Josephson junction array to synthesize quantum-accurate voltage waveforms. These waveforms will be used in voltage waveform metrology applications. Results from the synthesis of sinusoidal unipolar voltage waveforms from 3 to 300 kHz are presented. The margin of operation was measured and shown to require an optical pulse height stability better than 0.15 mW. The use of delta–sigma code with repeated sections, suitable for a quantum voltage digitizer was also examined. A test code corresponding to a delta–sigma feedback loop rate of 250 MHz was used to synthesize a 3.125 kHz sinusoidal waveform.
关键词： Josephson arbitrary waveform synthesizer,optoelectronics,metrology,Josephson arrays,measurement,voltage measurement
更新于2025-09-23 15:21:21
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Frequency-Dependent Verification of the Quantum Accuracy of a Quantum Voltage Noise Source
摘要： This paper describes the characterization of a quantum voltage noise source (QVNS) based on pulse-driven Josephson-arrays for frequencies up to 200 kHz. The QVNS synthesizes a voltage noise reference which is used to calibrate the electronics of a Johnson noise thermometer (JNT). To realize an “electronic Kelvin” with measurement uncertainty at μK/K-level, we investigated the frequency-dependent voltage difference between two pulse-driven Josephson Arrays, each one producing a 10 mV RMS sinusoidal voltage.
关键词： Josephson arbitrary waveform synthesizer,quantum voltage noise source,Josephson voltage standard
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - An Optoelectronic Pulse Drive for Quantum Voltage Synthesizer
摘要： An optoelectronic pulse drive system based on commercially available telecoms optoelectronic components and a field programmable gate array (FPGA) has been developed. The system was used to drive a Josephson junction array (JJA) to synthesize quantum-accurate voltage waveforms. Results from preliminary demonstration of the system are presented showing the synthesis of a 3.1 kHz sine wave.
关键词： Josephson arbitrary waveform synthesizer,opto-electronics,metrology,voltage measurement,Measurement,Josephson arrays
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - 1 V AC-DC Difference of a Thermal Transfer Standard Measured with a Pulsed Josephson Standard Unloaded by a Transconductance Amplifier
摘要： A transconductance amplifier (TCA) with a negative admittance has been used in parallel with a commercial thermal transfer standard (TTS) to unload the voltage source, a pulse-driven AC Josephson Voltage Standard (also known as Josephson Arbitrary Waveform Synthesizer or JAWS). AC-DC difference measurements at 1 V and at frequencies from 10 Hz to 10 kHz show excellent agreement with the values obtained by a conventional method. Expanded uncertainties between 0.28 μV/V and 0.39 μV/V (k=2), depending on the frequency, have been achieved.
关键词： thermal transfer standard,transconductance amplifier,AC-DC difference,pulse-driven,Josephson Arbitrary Waveform Synthesizer,Josephson Voltage Standard
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - A Novel Method for Calibration of ADC Using JAWS
摘要： A new method for the calibration of digitizers was tested. This method uses the unique ability of Josephson Arbitrary Waveform Synthesizer (JAWS) to generate almost any waveform with high precision. A complex waveform has been prepared such that the gain of a digitizer at different frequencies and amplitudes was calibrated simultaneously. The stability of the gain was also evaluated.
关键词： calibration,Josephson arbitrary waveform synthesizer,analogue-digital converter,stability,ADC,JAWS
更新于2025-09-10 09:29:36