32results about "Variable-capacitor element amplifiers" patented technology

In a method for implementation of a magnetic resonance examination, and a magnetic resonance apparatus, and an array for acquisition of magnetic resonance signals, and a magnetic resonance signal at a magnetic resonance frequency are acquired from an examination region with an array of frequency conversion units after an RF excitation and are radiated as frequency-converted signals. The resulting signal field is acquired by a number of reception antennas of a second antenna array, which are arranged at different spatial positions and thus allow a spatial resolution of the frequency-converted signals. The acquired acquisition signals are used for image reconstruction.

In a communication method for a magnetic resonance signal and a reception arrangement and magnetic resonance system corresponding therewith, a non-linear reactance is supplied with a magnetic resonance signal by a magnetic resonance reception antenna and with auxiliary energy by an auxiliary reception antenna. The auxiliary energy is emitted by an auxiliary transmission antenna. The non-linear reactance mixes the auxiliary energy and the magnetic resonance signal to form a mixed signal with a sum frequency and supplies it to a mixed signal transmission antenna. The latter emits at the mixed frequency. A mixed signal reception antenna receives the mixed signal and supplies it to an evaluation device.

A method for calibration of a magnetic resonance imaging system having a bore, a body coil mounted in the bore, a patient mat, a number of local coils mounted in the patient mat, an upconversion stage having a number of upconverters, and a processing stage, includes the steps of generating a calibration signal in the body coil; receiving the calibration signal at the local coils, upconverting the signal from the local coils in the upconversion stage, transmitting the upconverted signal to the processing stage, synchronously downconverting the signal in the processing stage using the calibration signal generated in the body coil, and processing the downconverted signal to generate an overall path complex gain.

A hybrid upconverter has a low noise amplifier and a two port parametric amplifier. The parametric amplifier has a first port to receive an input signal to be amplified and upconverted and a second port to receive a local oscillator signal and to output the amplified, upconverted signal at upper and lower sideband frequencies. The parametric amplifier further has an antenna coupled to the second port to receive the local oscillator signal and transmit the amplified, upconverted signal at upper and lower sideband frequencies. The low noise amplifier drives the first port of the parametric amplifier. The two port parametric amplifier has a pair of varactor diodes connected between the first port and the second port. The diodes are connected in parallel from the first port and in series from the second port. The low noise amplifier is connected directly to the pair of varactor diodes.

A two port parametric amplifier has a first port that receives an input signal to be amplified and upconverted and a second port that receives a local oscillator signal. The amplified upconverted input signal is emitted as an output at upper and lower sideband frequencies. The amplifier further has a pair of varactor diodes connected between the first port and the second port. The diodes are connected in parallel from the first port and in series from the second port.

A magnetic resonance imaging system upconverter stage has a number of local coils and a number of upconverters to receive a signal from an output of each coil. Each upconverter has a number of two port upconverter cores, each core having a first port to receive a signal from a local coil and a second port to output an upconverted signal at upper and lower sideband frequencies through an antenna coupled to the second port. The inputs of the plurality of upconverter cores are connected in parallel, and at least one antenna is associated with the second port of each core.

A method for calibration of a magnetic resonance imaging system having a bore, a body coil mounted in the bore, a patient mat, a number of local coils mounted in the patient mat, an upconversion stage having a number of upconverters, and a processing stage, includes the steps of generating a calibration signal in the body coil; receiving the calibration signal at the local coils, upconverting the signal from the local coils in the upconversion stage, transmitting the upconverted signal to the processing stage, synchronously downconverting the signal in the processing stage using the calibration signal generated in the body coil, and processing the downconverted signal to generate an overall path complex gain.

The invention discloses an impedance matching Joseph Sen parametric amplifier, a manufacturing method thereof and a communication module, belongs to the field of Joseph Sen parametric amplifiers, andaims to solve the problem that the impedance matching Joseph Sen parametric amplifier has larger signal attenuation and larger device size in the prior art. An impedance transformer, an anharmonic resonant cavity and a pump microwave circuit of the impedance matching Joseph Sen parametric amplifier are all integrated on a silicon substrate; and a second end of the impedance transformer is connected in series with the anharmonic resonant cavity through a superconducting material. Meanwhile, all components other than a supercapacitor insulating layer are made of the superconducting material, sothat the reflection and loss of signal microwaves of the manufactured amplifier are greatly reduced, and the attenuation constant is almost zero. The bandwidth of the amplifier can reach 1GHz or more,and the amplifier can work in a frequency range of 5GHz to 8GHz. Meanwhile, a preparation process is simplified, and the repeatability and yield of device manufacturing are improved.

A magnetic resonance signal from a magnetic resonance receiver antenna (4) and an auxiliary energy fed from an auxiliary receiver antenna (8) is transfered to a non-linear reactance (10). The auxiliary energy is transmitted by an auxiliary transmitter antenna (7). The non-linear reactance (10) mixes the auxiliary energy and magnetic resonance signal to form a mixed signal with a given frequency (f+), and transfers it to a mixed signal transmitter antenna. The mixed signal transmitter antenna emits the mixed signal with a given frequency (f+). A mixed signal receiver antenna (12) receives the mixed signal, and transmits it to a processing device (1).

Embodiments of the present invention provide a device with an integrated low-noise parametric amplifier using a CCD-based structure with minimal noise gain. In one embodiment, a device which may be used for monitoring and / or diagnosing a human or an animal body comprises a CCD-based device including a first gate forming a first capacitor and a second gate forming a second capacitor, the first capacitor having a surface area larger than a surface area of the second capacitor; and a controller configured to input a signal to the CCD-based device; convert the input signal into a charge packet having a voltage associated therewith; transfer the charge packet from the first capacitor to the second capacitor of the CCD-based device, the voltage associated with the charge packet being multiplied by a ratio of the surface area of the first capacitor divided by the surface area of the second capacitor; and produce an amplified output signal from the multiplied voltage.

The invention discloses a Josephson traveling wave amplifier and a preparation method thereof. The Josephson traveling wave amplifier comprises two metal layers and an intermediate dielectric layer; the first metal layer is an aluminum film, and a lower panel, an inductor and a ground plane of the capacitor are prepared through ultraviolet lithography; a second metal layer is used for preparing anupper panel of the Josephson junction and the capacitor through double-angle evaporation; the intermediate dielectric layer completely covers the first metal layer by using an aluminum oxide film grown by monoatomic layer deposition; wherein the Josephson structures form a transmission line, and two ends of the transmission line respectively form an input port and an output port of the Josephsontraveling wave amplifier; the Josephson junctions are connected with the ground through plate capacitors, and coplanar waveguide lines are adopted for connection at the bent positions of the transmission lines. By adopting the Josephson traveling wave amplifier provided by the invention, the material loss can be reduced, the preparation process is simplified, and the yield of device preparation isimproved.

The invention discloses a quantum parameter amplifier, the quantum parameter amplifier comprises a capacitor module for forming an oscillation amplification circuit, a reflection type microwave resonant cavity and an inductance-adjustable superconducting quantum interference device which are connected in sequence; one end, far away from the reflection type microwave resonant cavity, of the superconducting quantum interference device is grounded; the resonant frequency of the reflection type microwave resonant cavity is equal to the frequency of a signal to be amplified by adjusting the inductance of the inductance-adjustable superconducting quantum interference device; a signal to be amplified is coupled into the oscillation amplification circuit from the capacitor module; the oscillationamplification circuit is used for amplifying the signal to be amplified under the action of the pumping signal, and a plurality of idle frequency signals are generated; a second microwave resonant cavity is included and is connected to the end, away from the capacitor module, of the reflection type microwave resonant cavity, the resonant frequency of the second microwave resonant cavity is equal to the frequency of one idle frequency signal, and the frequency of the pumping signal, in the optimal working mode, of the quantum parameter amplifier does not need to be selected as the frequency multiplication of the to-be-amplified signal.

An upconverter has a two port parametric amplifier that has a first port to receive an input signal to be amplified and upconverted and a second port to receive a local oscillator signal and to output the amplified, upconverted signal at upper and lower sideband frequencies. The upconverter further has an antenna coupled to the second port to receive the local oscillator signal and transmit the amplified, upconverted signal at upper and lower sideband frequencies and a low noise amplifier at the first port of the parametric amplifier, which is powered by the local oscillator signal.

A PWM cycloconverter easily capable of improving an input current waveform and regenerating energy of a snubber into a power source is provided.A PWM cycloconverter includes a PWM converter connected to a DC voltage system. An output unit of the PWM converter is connected to a place before an input filter of the PWM cycloconverter to keep down resonance of the input filter.

An upconverter has a two port parametric amplifier that has a first port to receive an input signal to be amplified and upconverted and a second port to receive a local oscillator signal and to output the amplified, upconverted signal at upper and lower sideband frequencies. The upconverter further has an antenna coupled to the second port and a power splitter inserted between the second port of the parametric amplifier and the antenna.

A hybrid upconverter has a low noise amplifier and a two port parametric amplifier. The parametric amplifier has a first port to receive an input signal to be amplified and upconverted and a second port to receive a local oscillator signal and to output the amplified, upconverted signal at upper and lower sideband frequencies. The parametric amplifier further has an antenna coupled to the second port to receive the local oscillator signal and transmit the amplified, upconverted signal at upper and lower sideband frequencies. The low noise amplifier drives the first port of the parametric amplifier. The two port parametric amplifier has a pair of varactor diodes connected between the first port and the second port. The diodes are connected in parallel from the first port and in series from the second port. The low noise amplifier is connected directly to the pair of varactor diodes.

According to an example aspect of the present invention, there is provided a traveling wave parametric amplifier comprising a waveguide transmission line comprising therein at least ten Josephson elements, wherein each of the at least ten Josephson element comprises a loop, with exactly one Josephson junction of first size on one half of the loop and at least two Josephson junctions of a second size on a second half of the loop, the second size being larger than the first size, a flux bias line configured to generate a magnetic flux threading each of the at least one loop, and a set of resistors coupled with the flux bias line.

A wireless control device (1) comprises an antenna (5) and a power harvester (2) to generate power for the device from a radio frequency signal (7) incident on the antenna. The device further comprises an upconverter stage; the upconverter stage comprising a first port (21) to receive a control signal (13) to be upconverted and a second port (34) to receive the incident radio frequency signal (7) and to output the upconverted control signal at upper and lower sideband frequencies (8). The antenna is coupled to the second port.

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.

The invention discloses a parametric amplifier, a control method, a liquid crystal antenna, a display panel and a terminal, and belongs to the field of display technology. The parametric amplifier includes: a first base substrate and a second base substrate oppositely arranged, and a first liquid crystal layer filled between the first base substrate and the second base substrate; the parametric amplifier also includes: stacked on The signal transmission layer, the first insulating layer, and the first electrode layer on the side of the first base substrate close to the first liquid crystal layer, wherein the signal transmission layer includes: at least one signal transmission line, and the first electrode layer includes: a plurality of strip electrodes ; The ground plane, the second insulating layer and the second electrode layer arranged on the side of the second base substrate close to the first liquid crystal layer are stacked; wherein, the first electrode layer and the second electrode layer are used to load periodically changing control signals , so that the liquid crystal in the first liquid crystal layer deflects under the control of the control signal. The parametric amplifier simplifies the manufacturing process of a terminal with a liquid crystal display panel.

An RF receiver circuit configuration and design is limited by conditions and frequencies to simultaneously provide steady state low-noise signal amplification, frequency down-conversion, and image signal rejection. The RF receiver circuit may be implemented as one of a CMOS single chip device or as part of an integrated system of CMOS components.

A method for ramping a switched capacitor power amplifier is disclosed, where the switched capacitor power amplifier comprises a plurality of capacitors in a capacitor bank, and where a number of the capacitors in the capacitor bank are activated. The method comprises changing the number of capacitors in the capacitor bank that are activated, maintaining the changed number of activated capacitors in the capacitor bank for a period of time, and repeating the changing and maintaining, where a length of the period of time is varied between at least two repetitions of the maintaining.

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 PWM cycloconverter easily capable of improving an input current waveform and regenerating energy of a snubber into a power source is provided. A PWM cycloconverter includes a PWM converter connected to a DC voltage system. An output unit of the PWM converter is connected to a place before an input filter of the PWM cycloconverter to keep down resonance of the input filter.

This disclosure provides systems, methods, and apparatus related to a parametric amplifier. In one aspect, a device includes an electron source electrode, a counter electrode, and a pumping electrode. The electron source electrode may include a conductive base and a flexible conductor. The flexible conductor may have a first end and a second end, with the second end of the flexible conductor being coupled to the conductive base. A cross-sectional dimension of the flexible conductor may be less than about 100 nanometers. The counter electrode may be disposed proximate the first end of the flexible conductor and spaced a first distance from the first end of the flexible conductor. The pumping electrode may be disposed proximate a length of the flexible conductor and spaced a second distance from the flexible conductor.

The invention relates to a wireless control device comprising an antenna (5) and a power harvester (2) for generating power for the device from radio frequency signals incident on the antenna. The device also includes an up-conversion stage; the up-conversion stage includes a first port (21) and a second port (34), the first port is used to receive a control signal (13) to be up-converted, the first port The two ports are used for receiving incident radio frequency signals (7) and outputting up-converted control signals (8) at upper and lower sideband frequencies. The antenna is coupled to the second port.

A parametric amplifier device has a two port parametric amplifier, a DC voltage generator and a DC bias regulator. The bias regulator has a voltage regulator, an attenuator and a summer. Output voltages from the regulator and the attenuator are added in the summer.

An RF receiver circuit configuration and design is limited by conditions and frequencies to simultaneously provide steady state low-noise signal amplification, frequency down-conversion, and image signal rejection. The RF receiver circuit may be implemented as one of a CMOS single chip device or as part of an integrated system of CMOS components.