40results about "Galvano-magnetic amplifiers" patented technology

A system and method for employing variable magnetic flux bias in an amplifier. The amplifier system comprises an output transformer and a magnetic sensor configured to sense a first magnetic flux of the output transformer. The magnetic sensor generates a flux signal responsive to the first magnetic flux. Control circuitry is configured to receive the flux signal and to generate a control signal responsive to the flux signal. A winding is configured to receive the control signal and to induce a second magnetic flux within the output transformer responsive to the control signal, the second magnetic flux having opposite polarity to the first magnetic flux. The second magnetic flux may maintain a non-zero quiescent magnetic bias level within the output transformer, or may substantially cancel or null the DC and low-frequency subsonic components of the first magnetic flux.

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.

A driving circuit includes a power supply, an input capacitor, a Hall sensor, a first amplifier, a second amplifier, a full-bridge driver circuit, and a first operational amplifier. The input capacitor is coupled to the power supply. The input end of the first amplifier and the second amplifier is coupled to the output end of the Hall sensor. The control end of the full-bridge driver circuit is coupled to the output end of the first amplifier and the output end of the second amplifier. The first operational amplifier includes a first input end for receiving a first reference voltage and a second input end coupled to the first output end of the full-bridge driver circuit.

Disclosed herein are an offset compensation apparatus for a magnetic detection circuit, and a method thereof. The offset compensation apparatus includes: an amplifying unit amplifying an output voltage, and outputting the amplified voltages; an offset detection unit detecting an offset; a comparison unit determining whether or not the offset output from the offset detection unit is greater than a pre-set positive reference value or smaller than a pre-set negative reference value; a counter unit; and a current supply.

A magnetic logic unit (MLU) cell includes a first and second magnetic tunnel junction, each including a first magnetic layer having a first magnetization, a second magnetic layer having a second magnetization, and a barrier layer; and a field line for passing a field current such as to generate an external magnetic field adapted to adjust the first magnetization. The first and second magnetic layers and the barrier layer are arranged such that the first magnetization is magnetically coupled antiparallel with the second magnetization through the barrier layer. The MLU cell also includes a biasing device arranged for applying a static biasing magnetic field oriented substantially parallel to the external magnetic field such as to orient the first magnetization at about 90° relative to the second magnetization, the first and second magnetizations being oriented symmetrically relative to the direction of the external magnetic field.

An inductor device is disclosed that includes a first curved metal plate, a second curved metal plate below the first curved metal plate and substantially vertically aligned with the first curved metal plate, and Vertically aligned first elongated vias between the second curved metal plates, the first elongated vias being configured to conductively couple the first curved metal plate to the second curved metal plate and having a first elongated via of at least about 2 to 1 An aspect ratio of the width to height of an elongated via.