34 results about "Superconducting electronics" patented technology

A multiphase clock circuit in which bit errors are propagated only for the duration of the clock cycle in which a bit error occurs. The circuit recovers automatically from bit errors and is capable of operating at high frequency with high clock precision. The multiphase clock circuit can generate a plurality of clock pulse streams, each pulse stream at the same clock frequency, with fixed phase relationships among the streams. The multiphase clock circuit includes a master clock signal of frequency fc which is applied to a divide by N frequency divider circuit for producing a base clock signal of fc / N. The base clock signal is sequentially applied to the data input of a series chain of N clocked data flip-flops (DFFs) each of which is simultaneously clocked by a clock signal of frequency fc to produce N clock signals of base frequency fc / N separated from each other by a constant time delay T=1 / fc.

A new technique is presented for improving the microfabrication yield of Josephson junctions in superconducting integrated circuits. This is based on the use of a double-layer lithographic mask for partial anodization of the side-walls and base electrode of the junctions. The top layer of the mask is a resist material, and the bottom layer is a dielectric material chosen so as to a) maximize adhesion between the resist and the underlying superconducting layer, b) be etch-compatible with the underlying superconducting layer, and c) be insoluble in the resist and anodization processing chemistries. In a preferred embodiment of the invention, the superconductor is niobium, the material on top of this is silicon dioxide, and the top layer is conventional photoresist or electron-beam resist. The use of this combination results in a substantial increase in the fabrication yield of high-density superconducting integrated circuits due to increase in junction uniformity and reduction in defect density. An additional improvement over the prior art involves the replacement of a wet-etch step with a dry etch more compatible with microlithography.

A broadband multibit digital radio-frequency (RF) signal is synthesized digitally. to convert the digital signal to a high-power analog signal for RF transmission. Each bit (or cluster of bits) of the digital signal is first separately amplified using a fast switching amplifier with a controlled dc power supply voltage. The DC voltages are weighted to match the significance of the bits, and controlled by a set of calibrated DC reference sources to maintain high precision. The amplified digital signals from the various bits are then combined and passed through an appropriate analog filter to generate the RF signal to be transmitted. Such a signal can exhibit broad bandwidth, high dynamic range, excellent linearity, and low noise. Preferred embodiments of this system can incorporate superconducting electronic elements. For ultimate precision, a set of primary or secondary DC voltage standards can be used to regulate the switching amplifier supply voltages.

A new technique is presented for improving the microfabrication yield of Josephson junctions in superconducting integrated circuits. This is based on the use of a double-layer lithographic mask for partial anodization of the side-walls and base electrode of the junctions. The top layer of the mask is a resist material, and the bottom layer is a dielectric material chosen so as to a) maximize adhesion between the resist and the underlying superconducting layer, b) be etch-compatible with the underlying superconducting layer, and c) be insoluble in the resist and anodization processing chemistries. In a preferred embodiment of the invention, the superconductor is niobium, the material on top of this is silicon dioxide, and the top layer is conventional photoresist or electron-beam resist. The use of this combination results in a substantial increase in the fabrication yield of high-density superconducting integrated circuits due to increase in junction uniformity and reduction in defect density. An additional improvement over the prior art involves the replacement of a wet-etch step with a dry etch more compatible with microlithography.

The invention relates to Tl2Ba2CaCu2O8 (Tl-2212) superconducting film and its making method. Its superconducting change temperature is higher than 100K; the critical current density is greater than 1000000 A / sq cm at 77K; at 77K and at 10GHz, its surface resistance is less than 1m Ohm. Its thickness is between 10-1000nm. Its making method mainly two steps; first, depositing Tl-Ba-Ca-Cu-O non-crystalline pioneer film; second, making the high-temperature treatment to convert the non-crystalline pioneer film into the superconducting film. The invention resolves the method to make large area double-sided Tl-2212 extended superconducting film, which can make microwave passive devices or other superconducting electronic ones.

The present invention relates to a defect-free oxide high-critical temperature superconductor acicular crystal, that is, an oxide high-critical temperature superconductor acicular crystal that is substantially a perfect crystal and also relates to a method for producing the same, wherein such a crystal is essential for achieving superconducting electronic devices. The oxide high-critical temperature superconductor acicular crystal of the present invention includes an acicular crystal having a Bi2Sr2Ca2Cu3O10 (Bi-2223) crystal structure and is grown from a powder compact by heat-treating the powder compact in an oxygen atmosphere, wherein the powder compact contains an oxide having the Bi-2223 crystal structure and TeO2, CaO, or (SrCa)3TeO6. The achievement of the acicular crystal having the Bi-2223 crystal structure contributes to the development of superconducting electronic devices that have been theoretically proposed but have not been achieved.

The invention discloses a low-temperature microwave filtering system based on electromagnetic coupling of adiabatic space, The invention can effectively solve the problem that the conductive heat leakage of the low-temperature microwave filter module is large due to the direct connection of the input and output cables, and the conductive heat leakage of the low-temperature microwave filter moduleis reduced by the way of electromagnetic coupling in the adiabatic space, so that the whole temperature of the low-temperature microwave filter module is uniform and stable, and the performance of thelow-temperature microwave filter module is more stable and excellent; (cable with more excellent performance, i. E., coarser and short than previously available, enable that overall volume of the microwave electronic system to be reduced, the performance to be better, the power to be great, and the miniaturization of the microwave electronic system to be facilitated; On the premise of installingthe same number of cryogenic filter modules, the power consumption of the refrigeration platform is greatly reduced, and the volume and manufacturing cost of the superconducting electronic system aregreatly reduced. It makes possible the realization of some multi-channel superconducting electronic systems which can not be manufactured due to the limitation of cryogenic platforms.

The invention discloses a measuring device and a measuring method of superconductive AC magnetic susceptibility, belonging to the field of superconducting electronics. The measuring method comprises the steps of: positioning a measured superconducting material between a primary coil and a secondary coil, and fixing the elements in a sealed vacuum chamber, refrigerating the measured superconducting material via a compression refrigeration machine, extracting a voltage signal induced by the secondary coil through a phase-locking amplifier, and simultaneously providing AC voltage excitation to the primary coil through the phase-locking amplifier, measuring the temperature of the measured superconducting material through a temperature controller, storing the voltage signal measured by the phase-locking amplifier and a temperature signal measured by the temperature controller in a computer, and displaying the temperatiredependent curve of the voltage signal measured by the phase-locking amplifier in real time. The measuring method of the invention has the advantages of performing a nondestructive measurement on the conversion temperature of the superconducting material to conveniently master the measurement condition in time, and the measuring method is an efficient, accurate and reliable measurement manner, so that the measuring method has certain practical value for detecting the performance of the superconducting material.

The invention discloses an electronic superconducting solid state relay. The electronic superconducting solid state relay includes an auxiliary power supply circuit, a wide voltage constant current drive circuit, a timing control circuit, an automobile relay and a solid state relay; aiming at the defects in the prior art Designed, a new type of super solid state relay that combines electronic devices and relays. It has the following characteristics: 1. It is easy to install, does not generate heat and does not require a heat sink, and takes up less space; 2. Its own energy consumption is small (less than 2.5W); 3. It has a wide range of applications (AC version, control voltage AC and DC 7-450V. DC version control voltage 3 ‑60V); 4. You can directly use the start and stop buttons to control the main circuit without auxiliary power supply; 5. The anti-overload ability is twice the rated current.