47results about "Superconductive amplifiers" patented technology

The disclosure generally relates to a method and apparatus for providing high-speed, low signal power amplification. In an exemplary embodiment, the disclosure relates to a method for providing a wideband amplification of a signal by forming a first transmission line in parallel with a second transmission line, each of the first transmission line and the second transmission line having a plurality of superconducting transmission elements, each transmission line having a transmission line delay; interposing a plurality of amplification stages between the first transmission line and the second transmission line, each amplification stage having an resonant circuit with a resonant circuit delay; and substantially matching the resonant circuit delay for at least one of the plurality of amplification stages with the transmission line delay of at least one of the superconducting transmission lines.

A wireless Josephson-junction-based amplifier is described that provides improved tunability and increased control over both a quality factor Q and participation ratio p of the amplifier. The device may be fabricated on a chip and mounted in a waveguide. No wire bonding between the amplifier and coaxial cables or a printed circuit board is needed. At least one antenna on the chip may be used to couple energy between the waveguide and wireless JBA. The amplifier is capable of gains greater than 25 dB.

An on-chip Josephson parametric converter is provided. The on-chip Josephson parametric converter includes a Josephson ring modulator. The on-chip Josephson parametric converter further includes a lossless power divider, coupled to the Josephson ring modulator, having a single input port and two output ports for receiving a pump drive signal via the single input port, splitting the pump drive signal symmetrically into two signals that are equal in amplitude and phase, and outputting each of the two signals from a respective one of the two output ports. The pump drive signal excites a common mode of the on-chip Josephson parametric converter.

To obtain a superconducting driver circuit which can obtain an output voltage of several millvolts or above, can use a DC power source as a driving power source, can form no capacitance between it and a ground plane, and has a small occupation area, the superconducting driver circuit is constructed by superconducting flux quantum interference devices (SQUIDs) each constructing a closed loop having as components two superconducting junctions and an inductor. The SQUIDs share the inductors and are connected in series in three or more stages.

A traveling wave kinetic inductance parametric amplifier comprises a superconducting transmission line and a dispersion control element. The transmission line can include periodic variations of its dimension along its length. The superconducting material can include a high normal state resistivity material. In some instances the high normal state resistivity material includes nitrogen and a metal selected from the group consisting of titanium, niobium and vanadium. The traveling wave kinetic inductance parametric amplifier is expected to exhibit a noise temperature below 100 mK / GHz.

A superconducting switching amplifier embodying the invention includes superconductive devices responsive to input / control signals for clamping the output of the amplifier to a first voltage or to a second voltage. The amplifier includes a first set of superconducting devices serially connected between a first voltage line and an output terminal and a second set of superconducting devices serially connected between the output terminal and a second voltage line. The first set and the second set of devices are operated in a complementary fashion in response to control signals. When one of the first and second sets is driven to a superconducting (zero resistance) state the other set is driven to a resistive state. In accordance with the invention, the devices of each set are laid out in a pattern and driven in a manner to enable all the devices of each set to be driven to a selected state at substantially the same time. In one embodiment, the devices in each set are superconducting quantum interference devices (SQUIDs). Four sets of superconductive devices may be interconnected to function as a differential switching amplifier. The operating voltage applied to an amplifier may be varied to provide additional shaping of the output signal.

Supercooled electronics often use Rapid Single Flux Quantum (RSFQ) digital circuits. The output voltages from RSFQ devices are too low to be directly interfaced with semiconductor electronics, even if the semiconductor electronics are cooled. Techniques for directly interfacing RSFQ digital circuits with semiconductor electronics are disclosed using a novel inverting transimpedance digital amplifier in conjunction with a non-inverting transimpedance digital amplifier to create a differential transimpedance digital amplifier that permits direct interfacing between RSFQ and semiconductor electronics.

Dual amplifying circuits having a magnetic tunnel junction device and a field effect transistor configured in a complementing set are disclosed herein. In one embodiment, the field effect transistor is operable to control a current level of a current operating signal flowing through the magnetic tunnel junction device. In another embodiment, the magnetic tunnel junction device is operable to control a voltage level of a voltage signal being applied to a gate terminal of the field effect transistor. The gain-bandwidth product of both embodiments is greater than the individual gain-bandwidth products of the individual devices through the elimination of noise contributing resistive type circuit elements.

A single flux quantum (SFQ) pulse is generated (502) by injecting a superconductor output signal as a first signal at a “start” input (108) coupled to a superconductor delay element (104). The SFQ pulse is reflected (504) back and forth between first and second superconductor reflectors (102, 106) coupled to opposite ends of the superconductor delay element, thereby generating a time-disperse plurality of SFQ pulses at an output (110) coupled to the superconductor delay element. Thereafter, a second signal is input at a “stop” input (112) coupled to one of the first and second superconductor reflectors, thereby interrupting (506) the reflecting of the SFQ pulse at the one of the first and second superconductor reflectors, thus ending the generating of the time-disperse plurality of SFQ pulses at the output.

A Josephson-coupled resonator amplifier is provided. The Josephson-coupled resonator amplifier includes a first and a second resonator, each formed from respective lumped-element capacitance and respective lumped-element inductance. The Josephson-coupled resonator amplifier further includes one or more Josephson junctions coupling the first resonator to the second resonator, whereby a superconducting loop is formed from at least the lumped-element inductance of the resonators and the one or more Josephson junctions.

Dual amplifying circuits having a magnetic tunnel junction device and a field effect transistor configured in a complementing set are disclosed herein. In one embodiment, the field effect transistor is operable to control a current level of a current operating signal flowing through the magnetic tunnel junction device. In another embodiment, the magnetic tunnel junction device is operable to control a voltage level of a voltage signal being applied to a gate terminal of the field effect transistor. The gain-bandwidth product of both embodiments is greater than the individual gain-bandwidth products of the individual devices through the elimination of noise contributing resistive type circuit elements.

The present invention provides in one aspect a method of defining a logic cell library composed of complex functions and simple functions, with some of the complex functions obtained from identifying logic function patterns. In another aspect the present invention provides a method of designing a representation of an integrated circuit that uses complex functions and simple functions, with the complex functions including a plurality of non-standard complex Boolean logic functions that are determined to collectively provide for logic pattern minimization.

An apparatus includes a circuit and a field line. The circuit includes a magnetic tunnel junction including a storage layer and a sense layer. The field line is configured to generate a magnetic field based on an input signal, where the magnetic tunnel junction is configured such that a magnetization direction of the sense layer and a resistance of the magnetic tunnel junction vary based on the magnetic field. The circuit is configured to amplify the input signal to generate an output signal that varies in response to the resistance of the magnetic tunnel junction.

A circuit is presented that includes a first amplifier having an input, a transmission line having a first end and a second end. A first end of the transmission line is coupled to an input of the first amplifier and the plurality of channels. Each channel includes a plurality of resonators arranged to read out a plurality of qubits, respectively, and a readout line arranged to receive readout signals from the plurality of resonators. The readout line of each channel is coupled to the transmission line, and each channel is configured to output a respective signal in a respective frequency band different from the frequency bands of other channels of the plurality of channels.

The present disclosure relates to parametric amplifiers that can be used in the presence of a magnetic field. In particular the present disclosure relates to an integrated signal amplifier that comprises: a quantum dot; a first conductive electrode arranged in a manner such that tunnelling of electrons to the quantum dot is prevented; and a second conductive electrode arranged in a manner such tunnelling of electrons to the quantum dot is permitted. When an oscillating signal is applied across the first and second electrodes, the equivalent capacitance across the first and the second electrodes oscillates at the frequency of the oscillating signal.

A low-noise wide band amplifier is realized utilizing a superconductor-insulator-superconductor (SIS) junction, quasiparticle frequency mixers connected in tandem or in cascade, a first quasiparticle mixer performs first frequency mixing with use of a first local signal having a frequency not less than twice a frequency of an input signal to the first quasiparticle mixer, a second quasiparticle mixer performs second frequency mixing with use of a second local signal having a frequency not more than twice a frequency of an input signal to the second quasiparticle mixer, and signal amplification is performed through frequency conversion by extracting, from among a plurality of signals generated with the first and the second frequency mixing, a signal in a frequency band not more than a frequency band of the signal before the first frequency mixing and the second frequency mixing, using a transmission line or a filter.

A system and method are disclosed for a superconducting traveling-wave parametric amplifier (TWPA) with improved control and performance. In a preferred embodiment, the amplifier comprises an integrated array of symmetric rf-SQUIDs in a transmission line structure. A device was fabricated using niobium superconducting integrated circuits, and confirmed predicted performance, with a maximum gain up to 17 dB and a bandwidth of 4 GHz. A similar device can be applied as a low-noise, low-dissipation microwave amplifier for output from a superconducting quantum computer, or as a preamplifier, switch, or frequency converter for a sensitive microwave receiver, or as an output amplifier for a frequency-multiplexed superconducting detector array.