A high frequency oscillator has a high frequency generation part, an oscillation part, a matching unit, rectification element parts and switch parts. The oscillation part oscillates high frequency power generated by the high frequency generation part. The matching unit is arranged between the high frequency generation part and the oscillation part, and has one or more capacitors and matching circuits having difference characteristics so as to perform matching between the high frequency generation part and the oscillation part. The rectification element parts and the matching circuits are arranged in one-to-one correspondence. The rectification element parts rectify high frequency power supplied from the high frequency generation part to the oscillation part. The switch part is connected to the corresponding rectification element part to switch the corresponding capacitor connected to the corresponding matching circuit through the corresponding rectification element part.

A four-phase oscillator includes, a first oscillator configured to output a first differential signal, a second oscillator configured to output a second differential signal shifted in phase with respect to the first differential signal by 90 or 90 degrees, and a control circuit. The first oscillator includes a first tail current source and a second tail current source. The second oscillator includes a third tail current source and a fourth tail current source. The control circuit changes the frequency of the first and second differential signals by controlling at least one of a difference between a first current value supplied from the first tail current source and a third current value supplied from the third tail current source and a difference between a second current value supplied from the second tail current source and a fourth current value supplied from the fourth tail current source.

A four-phase oscillator includes, a first oscillator configured to output a first differential signal, a second oscillator configured to output a second differential signal shifted in phase with respect to the first differential signal by 90 or 90 degrees, and a control circuit. The first oscillator includes a first tail current source and a second tail current source. The second oscillator includes a third tail current source and a fourth tail current source. The control circuit changes the frequency of the first and second differential signals by controlling at least one of a difference between a first current value supplied from the first tail current source and a third current value supplied from the third tail current source and a difference between a second current value supplied from the second tail current source and a fourth current value supplied from the fourth tail current source.

An acoustic wave force field generator array that uses a plurality of synchronized oscillating emitters system that effectively blocks noise from passing through an acoustic barrier of wave/bubble pattern forms generated by the rapid oscillation of the integrated magnet and emitter system. The movement of the magnets also produces an EM field that generates a current to at least partially power the driver and speaker systems.

An acoustic wave force field generator array that uses a plurality of synchronized oscillating emitters system that effectively blocks noise from passing through an acoustic barrier of wave/bubble pattern forms generated by the rapid oscillation of the integrated magnet and emitter system. The movement of the magnets also produces an EM field that generates a current to at least partially power the driver and speaker systems.

A switched capacitance circuit selectively provides a capacitance across first and second output nodes in response to a selection control signal. The switched capacitance circuit may include a first capacitor coupled between the first output node and a mid-node, a second capacitor coupled between the second output node and the mid-node, and a switching circuit. The switching circuit is configured to switch the first and second capacitors in response to the selection control signal and to provide a bias voltage at the mid-node in response to the selection control signal.

A standing wave oscillator is described. The standing wave oscillator includes a transmission line, and an even number of gain stages. Each gain stage is connected to the transmission line, and each gain stage is located at a respective location along a length of the transmission line. The gain stages are configured to generate a standing wave oscillator signal along the length of the transmission line, when a supply voltage is applied to at least one end of the transmission line. The location of each gain stage is non-coincidental with an expected location of maximum amplitude of the standing wave oscillator signal.

A method for determining phase noise in a periodically modulated signal is described. The modulated signal is processed to generate a processed signal from the modulated signal. At least an approximate period of a modulation of the modulated signal is determined from the processed signal. The type of modulation of the modulated signal is determined from the processed signal. The modulated signal is demodulated based on the determined period and the determined type of modulation to generate a demodulated signal, and the phase noise is determined from the demodulated signal. Moreover, a measurement device is described.

A low loss unidirectional conductive sheet using magnetic field biasing and electron spin precession for coupling RF power to ferrite resonators, comprising the step of placing a plurality of ferrite resonators in a bias magnetic field to excite the electron spins of the materials of said ferrite resonators into precession.

A high-power transmitter with a fully-integrated phase Iocking capability is disclosed and characterized. Also provided herein is a THz radiator structure based on a return-path gap coupler, which enables the high-power generation of the disclosed transmitter, and a self-feeding oscillator suitable for use with the transmitter.