超导约瑟夫森任意波形合成器的Jitter灵敏度分析
Christine A Donnelly1,2, Justus A Brevik1, Paul D Dresselhaus1
1Superconductive Electronics Group, National Institute of Standards and Technology (NIST), Boulder, CO 80305 USA.
概括
这项研究分析了超导电压参考波形合成器中的动. 随机动的影响最小,但确定性动会降低信号质量,需要精确的微波计量技术来减轻信号质量.
科学领域:
- 电气工程 电气工程
- 计量学 计量学 计量学
- 超导电子产品 超导电子产品
背景情况:
- 准确的波形生成对于无线电频率 (RF) 计量学至关重要.
- 超导数字-模拟转换器 (DAC) 为高精度波形合成提供了潜力.
研究的目的:
- 执行超导电压参考波形合成器的第一个动灵敏度分析.
- 量化随机和确定性脉冲位置动 (PPJ) 对振幅精度和信号对噪声和扭曲比 (SNDR) 的影响.
主要方法:
- 在28 GHz运行的1.5位delta-sigma DAC的分析.
- 量化PPJ对基本音调幅度和带内SNDR的影响.
- 模拟 (100 kHz-1 GHz) 和实验 (100 kHz-3 MHz) 来验证动冲击.
主要成果:
- 随机PPJ高达200 fs rms对1 GHz的音调对准确性和SNDR的影响是微不足道的.
- 由非零直流偏差电流引起的决定性PPJ,在1 GHz时降低了在带内SNDR的30 dB.
- 超导DAC显示出没有输出脉宽动.
结论:
- 超导DAC对于高频波形合成的随机动具有坚固的耐受性.
- 必须减轻决定性动,以确保超导波形合成器的准确性.
- 这项工作建立了RF计量学的新范式,使用准确的参考波形源.
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