发明名称 |
AC and DC bipolar voltage source using quantized pulses |
摘要 |
A Josephson quantizer is driven by a sinusoidal microwave generator whose output is combined with a digital two-level code representing a desired waveform. The result is to produce a bipolar drive signal of increased frequency and a bipolar Josephson output with voltage increased significantly. Output voltage is developed according to the relationship V=Nnmfs/KJ, where N is the number of junctions, n is the Josephson junction constant voltage step number, fs is the sampling frequency, m is an integer multiple of the sampling frequency and is >=2, and KJ is the Josephson constant. The digital code generator receives the output of an improved modulator which incorporates a three-level to two-level transformation on the output of a standard three-level modulator in one embodiment. In a second embodiment, a modified two-level modulator produces a bit sequence where the polarity of the next bit is allowed to change only if there is an odd number of consecutive bits of the same polarity.
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申请公布号 |
US6236344(B1) |
申请公布日期 |
2001.05.22 |
申请号 |
US19990347245 |
申请日期 |
1999.07.02 |
申请人 |
THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE |
发明人 |
BENZ SAMUEL P.;HAMILTON CLARK A.;BURROUGHS CHARLES J.;HARVEY TODD E. |
分类号 |
H03B28/00;H03M1/82;(IPC1-7):H03M1/00 |
主分类号 |
H03B28/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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