发明名称 |
Josephson junction digital to analog converter for accurate AC waveform synthesis |
摘要 |
A low noise accurate signal generator for a calibration system or a radar system includes a generator of a digital data stream having a predetermined frequency spectrum incorporated therein. A series connected array of Josephson junctions is coupled to and excited by the digital data stream to provide a stream of pulses with quantum mechanically accurate time integral. A low pass analog signal filter is coupled to the pulses of accurate time integral for extracting analog signals of the predetermined frequency spectrum. For radar applications, a low phase-noise local oscillator of a fixed RF frequency and the output of the filter are coupled to a signal mixer which outputs low phase-noise chirped RF signals for use in generating transmit pulses for the radar system whereby enhanced detection of targets in "clutter" can be obtained.
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申请公布号 |
US5812078(A) |
申请公布日期 |
1998.09.22 |
申请号 |
US19970861732 |
申请日期 |
1997.05.22 |
申请人 |
NORTHROP GRUMMAN CORPORATION;NAT INST OF STANDARDS & TECH |
发明人 |
PRZYBYSZ, JOHN XAVIER;WORSHAM, ANTHONY HODGE;BENZ, SAMUEL PAUL;HAMILTON, CLARK ALLEN |
分类号 |
H03M3/02;(IPC1-7):H03M1/00 |
主分类号 |
H03M3/02 |
代理机构 |
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