High resolution ADC system
ABSTRACT We have developed and verified experimentally a novel
high-resolution superconducting ADC architecture based on phase
modulation/demodulation principle and implemented in RSFQ logic. We have
demonstrated an ADC chip providing full implementation of this
architecture, including on-chip decimation filter and multiple-channel
synchronizer. We have also developed a digital ADC evaluation system
consisting of an interface electronics block converting the low-voltage
ADC output to standard TTL form at multi-MHz sampling rate, and a
computerized test station performing data acquisition, processing and
display in real time. Using this system we have demonstrated that for
low-frequency (kHz) signals our ADC chips possess linearity in excess of
16 bits with Spur-Free Dynamic Range over 108 dB, which is an important
benchmark for any high-resolution ADC technology
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- "during that clock interval. It is possible to increase the resolution of this low-pass first-order delta modulation by using a multichannel synchronizer, which effectively subdivides the clock period . Functionally, this multichannel synchronizer increases the number of quantization levels ( ). "
ABSTRACT: Ultrafast switching speed, low power, natural quantization of magnetic flux, quantum accuracy, and low noise of cryogenic superconductor circuits enable fast and accurate data conversion between the analog and digital domains. Based on rapid single-flux quantum (RSFQ) logic, these integrated circuits are capable of achieving performance levels unattainable by any other technology. Two major classes of superconductor analog-to-digital converters (ADCs) are being developed - Nyquist sampling and oversampling converters. Complete systems with digital sampling at rates of ∼20 GHz and above have been demonstrated using low-temperature superconductor device technology. Some ADC components have also been implemented using high-temperature superconductors. Superconductor ADCs have unique applications in true digital-RF communications, broadband instrumentation, and digital sensor readout. Their designs, test results, and future development trends are reviewed.Proceedings of the IEEE 11/2004; 92(10-92):1564 - 1584. DOI:10.1109/JPROC.2004.833660 · 5.47 Impact Factor
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- "the reference phase, which is modulated by the measured signal. In previous papers    the RPG had not been discussed; it was presented simply as an ideal source of dc voltage exactly corresponding to one half of the clock frequency. In accordance with the fundamental Josephson relationship between voltage and phase, the RPG produces a linearly growing phase. "
ABSTRACT: This paper is a progress report on the development of a high-resolution analog-to-digital converter (ADC) which uses a phase modulation/demodulation architecture. Presented are an analysis of the performance limitations, proposed design improvements, and recent test results. Test results for new versions of room temperature VXI-based interface and processing modules are also described.
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ABSTRACT: This paper reviews progress in superconductor electronics over the decade since the discovery of the high temperature oxide superconductors (HTS). Almost simultaneously with that discovery was the development of a new process for low temperature superconductor (LTS) devices based on the Nb/AlOx/Mb whole wafer tunnel junction. Both of these developments facilitated a strong growth in applications. We review first the applications based on thin films with no Josephson junctions. This is mostly using HTS, which permits more convenient cooling thus making applications mere commercially viable. With their need for only one or two Josephson junctions, SQUID magnetometers have succeeded to the market place using HTS materials. Finally, we review progress in the volt standard and digital circuits, both of which require large numbers of junctions and at present can only be realized with LTS materialsIEEE Transactions on Applied Superconductivity 07/1997; 7(2-7):98 - 111. DOI:10.1109/77.614427 · 1.32 Impact Factor