With Periodoic Or Repetitious Amplitude Varying Means (e.g., Tremolo) Patents (Class 331/106)
  • Patent number: 9058964
    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.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: June 16, 2015
    Assignee: Thermo Fisher Scientific (Bremen) GmbH
    Inventors: Alexander A. Makarov, Alexander Kholomeev
  • Patent number: 8125280
    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.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: February 28, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Marko Rocznik, Dayo Oshinubi
  • Patent number: 7764137
    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.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: July 27, 2010
    Assignee: SuVolta, Inc.
    Inventor: Christopher L. Hamlin
  • Publication number: 20100127785
    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.
    Type: Application
    Filed: October 20, 2009
    Publication date: May 27, 2010
    Inventors: Marko Rocznik, Dayo Oshinubi
  • Patent number: 7339440
    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.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: March 4, 2008
    Assignee: President and Fellows of Harvard College
    Inventors: David Ricketts, Xiaofeng Li, Donhee Ham
  • Patent number: 6973399
    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.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: December 6, 2005
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventors: Reiner Burgschat, Mathias Krauss
  • Publication number: 20040150428
    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.
    Type: Application
    Filed: December 19, 2003
    Publication date: August 5, 2004
    Inventors: Atsushi Itoh, Motoko Ichihashi
  • Publication number: 20010030556
    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).
    Type: Application
    Filed: June 18, 2001
    Publication date: October 18, 2001
    Inventors: Kenneth D. Hartman, David J. Kenny, Matthew J. Klueppel
  • Patent number: 4163177
    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.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: July 31, 1979
    Inventors: Arthur R. Warner, Derrick A. Ward
  • Patent number: 4057769
    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.
    Type: Grant
    Filed: September 14, 1976
    Date of Patent: November 8, 1977
    Assignee: Rediffusion Reditronics Limited
    Inventor: Lawrence Dudley Woolf
  • Patent number: 4037164
    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.
    Type: Grant
    Filed: February 18, 1976
    Date of Patent: July 19, 1977
    Assignee: Systron Donner Corporation
    Inventors: Shailer T. Pickton, Gordon B. Dean