A Synthesis Method of AC Quantum Voltage Waveform

A technology of voltage waveform and synthesis method, applied in the direction of pulse shaping, etc., can solve the problem of reducing the accuracy of ACJVS synthesis signal, and achieve the effect of simplifying the synthesis system and synthesis process

Inactive Publication Date: 2017-09-01
NAT INST OF METROLOGY CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It is superimposed with the synthesized quantum voltage signal in a nearly orthogonal manner, which reduces the accuracy of the ACJVS synthesized signal, and the induced voltage error is especially serious when synthesizing high-frequency signals

Method used

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  • A Synthesis Method of AC Quantum Voltage Waveform
  • A Synthesis Method of AC Quantum Voltage Waveform
  • A Synthesis Method of AC Quantum Voltage Waveform

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Embodiment Construction

[0025] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] The schematic diagram of the synthesis principle of the AC quantum voltage waveform of the present invention and the schematic diagram of the system structure are as follows: figure 1 shown.

[0027] figure 1 (a) shows the principle diagram of AC quantum voltage waveform synthesis, figure 1 (b) is a schematic diagram of the structure of the AC quantum voltage waveform synthesis system. Such as figure 1 Shown in (b), the quantum voltage synthesis system that the present invention adopts comprises at least bipolar pulse generator 1, and described bipolar pulse generator 1 is preferably Sympuls BPG12G-TER; DC resistor 2; Josephson junction circuit 3. The Josephson junction array circuit 3 is an integrated chip made by NIST and contains 6400 Josephson junctions; a terminal resistor 4 . The quantum voltage synthesis system also includes other equi...

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Abstract

The invention relates to a method for synthesizing an AC quantum voltage waveform. The method includes: recoding the result of Δ-Σ modulation on the waveform to be synthesized, so that the corresponding high-speed digital code does not contain the low-frequency component of the waveform to be synthesized, and using bipolar pulses The generator outputs the digital code to drive the Josephson junction array to output the quantum voltage pulse corresponding to the forward pulse, thereby synthesizing the alternating quantum voltage signal. For the bipolar pulses output by the pulse generator, the contribution of the positive pulse and the negative pulse to the low-frequency components cancel each other out, the positive pulse drives the Josephson junction array to work at the first quantum voltage step, and the negative pulse drives the Josephson junction array at the first quantum voltage step. Zero quantum voltage steps. The AC quantum voltage waveform synthesis method can greatly simplify the AC quantum voltage waveform synthesis system, and can effectively reduce the induced voltage error caused by the Josephson junction array's own inductance, and improve the accuracy of the synthesized quantum voltage signal.

Description

technical field [0001] The invention belongs to the field of precision electromagnetic measurement, and in particular relates to a method for synthesizing an AC quantum voltage waveform. Background technique [0002] In 1996, Hamilton and Benz of NIST in the United States proposed a pulse-driven alternating quantum voltage waveform synthesis method for the first time. The method is based on the AC Josephson effect, that is, a series of high-speed current pulse sequences are used to drive the Josephson junction array. When the current pulse works within the quantum voltage step, no matter how the pulse amplitude changes, the Josephson junction array After the array is driven, it will correspondingly generate a quantum voltage pulse whose time-integrated area is equal to h / 2e. When synthesizing waveforms, first use Δ-Σ modulation to modulate the waveform to be synthesized into a series of digital patterns, store the generated digital patterns in the pulse signal generator and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/01
Inventor 屈继峰周琨荔
Owner NAT INST OF METROLOGY CHINA
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