Abstract: An electronic power converter is configured to receive power from a power source. The power operates at a switching frequency. The electronic power converter includes a resonant tank circuit operatively connected to the power converter. The resonant tank circuit operates at a tank resonant frequency. The electronic power converter includes a controller operatively connected to the resonant tank circuit. The electronic power converter further includes a variable inductor operatively connected to the resonant tank circuit. The variable inductor is configured to modify the tank resonant frequency to match the switching frequency within a predetermined margin.

Abstract: A radio frequency (RF) transmitter, comprising a Tesla transformer and an LC oscillator, said Tesla transformer comprising inner and outer conductors (10, 20), said inner conductor (20) comprising a generally tubular magnetic core (22) carrying a conductive member (22a) on its outer surface and said outer conductor (10) comprising a generally tubular magnetic core (13) carrying a conductive member (12) on its inner surface, said LC oscillator including a secondary winding module (40) comprising a generally tubular body (41) carrying a conductive coil (42) on its outer surface, said inner conductor (20), outer conductor (10) and secondary winding module (40) being arranged in a substantially concentric nested configuration such that said inner conductor (20) is located within said secondary winding module (40) and said secondary winding module (40) is located within said outer conductor (10), wherein a first portion (45) of relatively high permittivity dielectric material is provided between said conductive me

Abstract: A method actuates a fuel injector having a coil drive with a solenoid and a magnet armature. The magnet armature can be moved along a longitudinal axis by a magnetic field generated by the solenoid. In the method, an amplification voltage is applied to the solenoid at a predefined point in time to move the magnet armature from a closed position into an open position. The amplification voltage is made available by a voltage-regulated direct voltage transformer from a supply voltage. The direct voltage transformer has a storage capacitor for supporting the voltage made available at the output of the direct voltage transformer. The storage capacitor is charged to a pilot control voltage by the amplification voltage before the given point in time, with the result that the voltage present at the solenoid is higher than the amplification voltage at the predefined point in time.

Abstract: A continuous or distributed resonator geometry is defined such that the fabrication process used to form a spring mechanism also forms an effective mass of the resonator structure. Proportional design of the spring mechanism and/or mass element geometries in relation to the fabrication process allows for compensation of process-tolerance-induced fabrication variances. As a result, a resonator having increased frequency accuracy is achieved.

Abstract: An all-pass filtering module of a common mode noise suppressing device includes first and second differential transmission circuits coupled to a reference node. Each of the first and second differential transmission circuits has an input terminal and an output terminal, and includes: first and second capacitive elements coupled in series between the input terminal and the output terminal; a first inductor coupled between the input terminal and the output terminal; and a third capacitive element and a second inductor coupled in series between the reference node and a common node between the first and second capacitive elements.

Abstract: A method of switching between two modes of power supply to a mass analyzer is provided. In a first mode of operation, operated for a first predefined time duration, a first power supply, coupled to the mass analyzer, generates a first nonzero potential, while a second power supply, disconnected from the mass analyzer, generates a second non-zero potential. In a second mode of operation, operated for a second predefined time duration, the second potential is coupled to the mass analyzer, while the first power supply, disconnected from the mass analyzer, generates the first potential. These predefined time durations are selected such that only one of: the first potential; and the second potential is coupled to the mass analyzer at any time, and such that the first and second modes of operation are carried out at least once within a predetermined length of time.

Abstract: In a method for regulating an excited oscillation of a system to a resonance case of the system, instantaneous values of the oscillating quantity are discretely recorded using one sampling frequency, and the sampling frequency is selected to be below twice a maximum frequency of the system. In addition, the following steps are provided: ascertaining an oscillation amplitude from the instantaneous values; regulating a control amplitude on the basis of the ascertained oscillation amplitude; specifying a control frequency on the basis of the control amplitude; generating a control oscillation in consideration of the control frequency; combining the oscillation amplitude and the control oscillation to form a control signal; and exciting the system in consideration of the control signal.

Abstract: A circuit can include an amplifier having at least a first junction field effect transistor (JFET) of a first conductivity type with a source coupled to a first power supply node, and a drain coupled to an amplifier output node. A first variable bias circuit can be coupled between the drain and at least one gate of the first JFET. The first variable bias circuit can alter a direct current (DC) bias to the first JFET according a potential at the amplifier output node. A first bias impedance can be coupled between the drain of the first JFET and a second power supply node. The circuit can also include a non-linear transmission line (NLTL) coupled between the amplifier output and a gate of the first JFET. The NLTL being configured to propagate an electrical soliton.

Abstract: In a method for regulating an excited oscillation of a system to a resonance case of the system, instantaneous values of the oscillating quantity are discretely recorded using one sampling frequency, and the sampling frequency is selected to be below twice a maximum frequency of the system. In addition, the following steps are provided: ascertaining an oscillation amplitude from the instantaneous values; regulating a control amplitude on the basis of the ascertained oscillation amplitude; specifying a control frequency on the basis of the control amplitude; generating a control oscillation in consideration of the control frequency; combining the oscillation amplitude and the control oscillation to form a control signal; and exciting the system in consideration of the control signal.

Abstract: Methods and apparatus for implementing stable self-starting and self-sustaining electrical nonlinear pulse (e.g., soliton, cnoidal wave, or quasi-soliton) oscillators. In one example, a nonlinear pulse oscillator is implemented as a closed loop structure that comprises a nonlinear transmission line, an improved high-pass filter, and a nonlinear amplifier configured to provide a self-adjusting gain as a function of an average voltage of the oscillator signal, to provide a pulse waveform having a desired target amplitude. In one implementation, the nonlinear amplifier and high pass filter functions are integrated in a two stage nonlinear amplifier/filter apparatus employing complimentary NMOS and PMOS amplification components and associated filtering and feedback circuitry configured to essentially implement an electric circuit analog of a saturable absorber via an adaptive bias control technique.

Abstract: A circuit arrangement for the correction of periodic signals from an incremental position measuring system that includes a first assembly comprising a multiplexer having an input to which a periodic signal is supplied and an output out of which an output signal is transmitted, a second assembly that receives the output signal and compares the output signal with at least one preset threshold value and, the second assembly selects a manipulated variable as a function of an actual position of a signal parameter in relation to the at least one preset threshold value from at least two preset, different manipulated variables and an actuating member that performs an action on the signal parameter in order to adjust the signal parameter in a direction toward a preset setpoint value.

Abstract: A piezoelectric resonator is immersed in a liquid, an AC signal is applied, and a local maximum of the conductance is determined. A frequency change due to the viscosity effect is determined from two frequencies of three frequencies including a resonance frequency that is applied at that local maximum, and first and second half-value frequencies at which a half-value conductance of half that local maximum is given. The influence of the mass effect can be eliminated, so that an accurate measurement of the viscosity change is possible. Moreover, if the substance to be analyzed that is contained in the liquid adheres to a reaction film of the piezoelectric resonator, the mass of the piezoelectric resonator changes, and the second half-value frequency is measured. It is thus possible to derive only the influence of the mass effect, since the half-value frequencies are not influenced by the viscosity effect.

Abstract: A frequency correction circuit includes a temperature sensor (100) disposed to measure temperature and produce temperature signals representing sensed temperatures. A data supplier (110) stores information items, receives digital input signals representing and produces a digital output information signal representing an item selected in accordance with the digital input signal. A control circuit (120) receives the temperature signals and receives the digital output information signal. The control circuit (120) produces control signals based on the temperature signals. A clock circuit (150) is disposed to generate a reference frequency signal. A digital synthesizer (130) receives the reference frequency signal and the control signals. The digital synthesizer produces an output frequency signal as directed by the control signals received from the control circuit (120).

Abstract: An oscillation generator providing a succession of oscillations repetitively and progressively varying in amplitude includes a feedback oscillator arranged to receive its operating voltage from a capacitor that is progressively charged from a periodically fluctuating voltage source by way of an SCR and a timing circuit arranged to progressively vary the timing during the fluctuation period of the source of firing signals applied to the SCR. The timing circuit includes a firing capacitor charged from a unidirectional source and semiconductor switches arranged, when the potential on the firing capacitor attains a predetermined level, to discharge the capacitor into the trigger electrode of the SCR. The time required for the potential on the firing capacitor to reach the predetermined level is varied by a saw-tooth generator that controls the charging potential for the capacitor.

Abstract: An electrical signal generator comprises an electric wave oscillator for producing oscillations at one or other of two predetermined frequencies, an attenuator device for attenuating oscillations produced by the oscillator in a manner which varies over a period of time, and control means for controlling the oscillator to produce a burst of oscillations at one said predetermined frequency and a subsequent burst of oscillations at the other said predetermined frequency. The control means controls the attenuator device increasingly to attenuate the oscillations over the period of each burst.

Abstract: A command signal is provided through a buffer amplifier to an exponential signal generator which provides an exponential signal envelope at the output thereof. The exponential signal envelope is coupled to an inverting unity gain amplifier for providing an inverse exponential signal envelope. The exponential and inverse exponential signal envelopes are coupled to an astable element which provides an output frequency having an amplitude related to the exponential signal envelopes. Means are included in the exponential signal generator for providing a predetermined decay time for the exponential signal envelopes. Means are included in the astable element for providing a predetermined frequency at the output of the astable element. Means are also included in the astable element for providing a common assymptote for the exponential and inverse exponential signal envelopes.