SBIR Phase II: An Eight-bit Superconducting Analog-to- Digital Converter with 10GHz Input Bandwidth

95-03344布拉德利这个小型企业创新研究第二阶段项目将致力于在从直流到20千兆赫的更宽频率范围内实现数字数据采集和高速信号记录的新能力。一种名为瞬变数字化仪的新仪器将能够通过记录这些信号并存储它们以供分析，从而表征高速电子设备(或任何可转换为电信号的签名)。第一阶段开发了一种比较器，旨在作为超高速模数转换器(ADC)的基础，其性能比目前可用的高出一个数量级。第二阶段的目标是设计、制造和测试全超导ADC系统。超导电子学将非常低的噪音与快速、高灵敏度测量所需的高开关速度结合在一起。这种方法的一个优点是，磁通量量化允许使用单个比较器进行许多精确的、等间距的阈值。具有这一特性的ADC不需要复杂得多的电路，也不需要具有非常精确数值的电阻。改进的数字化仪将在为光纤接口、交换网络、通信和计算机设计的高速电子设备中得到广泛应用。

95-03344 Bradley This Small Business Innovation Research (SBIR) Phase II project will address a new capability for digital data acquisition and recording of high speed signals over an extended frequency range, from dc to 20 GigaHertz. A new instrument, called a transient digitizer, will be able to characterize high speed electronics (or any signature convertible to an electric signal) by recording these signals and storing them for analysis. Phase I developed a comparator designed to be the basis of an ultra-high speed analog-to-digital converter (ADC) with an order-of-magnitude higher performance than is currently available. Phase II goals are to design, fabricate, and test the full superconducting ADC system. Superconducting electronics combine very low noise with the high switching speeds required in fast, high-sensitivity measurements. An advantage of this approach is that magnetic flux quantitization permits many precise, equally spaced thresholds with a single comparator. ADCs with this characteristic require much less complex circuitry and have no need for resistors with very precise values. Improved digitizers would find extensive application in high speed electronics designed for optical fiber interfaces, switching networks, communication, and computers.