Push-pull Patents (Class 331/114)
  • Patent number: 10505497
    Abstract: An oscillator is provided with an oscillator circuit having tank circuit terminals for coupling to a tank circuit. A microelectromechanical system (MEMS) resonator serves as a tank circuit. The MEMS resonator is coupled to the oscillator circuit using a transformer with a primary coil coupled to the oscillator tank circuit terminals and a secondary coil coupled to the MEMS resonator terminals, wherein the transformer has a turns ratio of N:1 and N is greater than 1.
    Type: Grant
    Filed: October 5, 2017
    Date of Patent: December 10, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Bichoy Bahr, Baher Haroun, Ali Kiaei
  • Patent number: 10281313
    Abstract: A radar fill level measurement device for determining a fill level of a medium is provided, including a radar module to generate a transmission signal of at least 60 GHz; and an antenna coupled to the module and to transmit the signal to a surface of the medium and to receive a reflected signal, the module including a phase-locked loop including a push-push oscillator and a phase detector, the oscillator including a first and second outputs, a duplexer coupled between the push-push oscillator and the antenna, and a frequency multiplier coupled between the oscillator second output and the duplexer, the oscillator first output being directly wired to the phase detector input, the duplexer being coupled to the antenna, the phase detector including a reference input and a phase detector output coupled to an oscillator control input. A method for operating a radar fill level measurement device is also provided.
    Type: Grant
    Filed: May 8, 2018
    Date of Patent: May 7, 2019
    Assignee: VEGA GRIESHABER KG
    Inventors: Daniel Schultheiss, Christoph Mueller
  • Patent number: 9324230
    Abstract: A system for mounting in a vehicle and for providing a control signal to a remote device based on information stored in a portable electronic device includes a radio frequency transmitter for transmitting a control signal to the remote device. The system also includes a first circuit configured to receive first information from the portable electronic device via inductive-coupling between the portable electronic device and the first circuit when the portable electronic device is brought within the induction field of the first circuit. The system also includes a second circuit configured to use the first information received from the portable electronic device and to at least one of format the control signal in accordance with the first information and to cause the radio frequency transmitter to format the control signal in accordance with the first information.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: April 26, 2016
    Assignee: GENTEX CORPORATION
    Inventors: Richard J. Chutorash, Philip J. Vanderwall, Mark Zeinstra, James E. Trainor
  • Patent number: 8981861
    Abstract: An injection locked pulsed oscillator includes a voltage controlled oscillator (VCO) responsive to an injection signal. The injection locked pulsed oscillator includes at least one enable circuit responsive to a first enable signal to enable output pulses from the VCO. The injection locked pulsed oscillator also includes timing circuit responsive to a pulse repetition frequency signal and is configured to provide the injection signal to phase lock the VCO and provide the first enable signal delayed from the injection signal to shape a width of the output pulses from the VCO.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 17, 2015
    Assignee: Hittite Microwave Corporation
    Inventors: Cemin Zhang, Christopher T. Lyons
  • Patent number: 8970310
    Abstract: As provided herein, in some embodiments, monolithic oscillators with low phase noise, large swing voltages, wide tuning, and high frequency characteristics are obtained by a monolithic integrated circuit having an oscillator core configured to generate a first output signal, and one or more tuning units operatively coupled to the oscillator core. In some embodiments, the oscillator core is a push-push oscillator core having a bipolar junction transistor, and each of the tuning units uses a FET transistor to present a selectable capacitance. In some embodiments, the tuning units have high-voltage and high-frequency capabilities. In some embodiments, the tuning units use MEMS switches to selectively connect capacitances to the oscillator core. In some embodiments, the oscillator core generates a second signal that has twice the frequency of the first frequency.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: March 3, 2015
    Assignee: Analog Devices, Inc.
    Inventors: James Breslin, Michael F. Keaveney
  • Publication number: 20140097910
    Abstract: As provided herein, in some embodiments, monolithic oscillators with low phase noise, large swing voltages, wide tuning, and high frequency characteristics are obtained by a monolithic integrated circuit having an oscillator core configured to generate a first output signal, and one or more tuning units operatively coupled to the oscillator core. In some embodiments, the oscillator core is a push-push oscillator core having a bipolar junction transistor, and each of the tuning units uses a FET transistor to present a selectable capacitance. In some embodiments, the tuning units have high-voltage and high-frequency capabilities. In some embodiments, the tuning units use MEMS switches to selectively connect capacitances to the oscillator core. In some embodiments, the oscillator core generates a second signal that has twice the frequency of the first frequency.
    Type: Application
    Filed: October 10, 2012
    Publication date: April 10, 2014
    Applicant: Analog Devices, Inc.
    Inventors: James Breslin, Michael F. Keaveney
  • Patent number: 8219054
    Abstract: According to an aspect of the invention, an oscillating circuit includes: a first MOS transistor having a first drain terminal and a first source terminal; a load element connected to the first drain terminal; and an oscillator connected to the first source terminal and outputs a fundamental signal and a harmonic signal, wherein the harmonic signal is amplified so that the amplified harmonic signal is output from the first drain terminal.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: July 10, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroaki Hoshino, Toshiya Mitomo
  • Patent number: 8022776
    Abstract: The present disclosure relates to coupled circuits and methods of coupling circuits having a power supply wherein a plurality of transistors are inductively coupled directly to the power supply for providing a single DC supply voltage directly to each of the plurality of transistors, and wherein a plurality of transformers have primary and secondary windings, the primary and secondary windings providing, at least in part, inductive loads for inductively coupling the plurality of transistors to the power supply, the plurality of transformers also providing an AC signal path for coupling neighboring ones of the plurality of transistors together.
    Type: Grant
    Filed: August 2, 2006
    Date of Patent: September 20, 2011
    Assignee: The Regents of the University of California
    Inventors: Mau-Chung Frank Chang, Daquan Huang, Tim Richard LaRocca
  • Patent number: 8006918
    Abstract: An air treatment device having a piezoelectric actuator powered by a transformer. The transformer has dual inputs comprising oppositely wound coils and input power signals 180 degrees out of phase. This arrangement provides a stronger drive signal to the actuator.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: August 30, 2011
    Assignee: The Proctor & Gamble Company
    Inventors: William Paul Mahoney, III, Fernando Ray Tollens
  • Patent number: 7801483
    Abstract: A transmitter (2) modulates information to be transmitted with an alternating-current signal having a predetermined frequency and includes a variable reactance section (16) which produces resonance with a stray capacitance (18) between a circuit ground (17) in the transmitter (2) and an earth ground (20) which strays from the earth ground (20) and a stray capacitance (19) between the human body (3) and the earth ground (20).
    Type: Grant
    Filed: January 24, 2007
    Date of Patent: September 21, 2010
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Tadashi Minotani, Mitsuru Shinagawa
  • Patent number: 7598820
    Abstract: A magnetic drive and mechanical oscillator system comprising a mechanical oscillator, a coil, a means for providing alternating current to said coil thereby creating a magnetic field within and about the coil, said means including an on-off means and a ferromagnetic material in communication with the diaphragm of the mechanical oscillator and the coil.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: October 6, 2009
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Manuel S. Alvarez, Henry Alan Wolf, Martin Mellert, Josef Fehrenbach
  • Patent number: 7315220
    Abstract: A voltage controlled oscillator (VCO) having a single stage ring-oscillator having both coarse and fine control of the frequency of oscillation is described. In an embodiment the VCO may include a first n-channel latch having a first output and a second output; a first P-channel transistor coupled between a voltage supply and a first VCO output, where a gate of the first P-channel transistor is coupled to the first output of the first n-channel latch; a first programmable resistor circuit coupled between the first VCO output and the first output of the first n-channel latch; and a second n-channel latch coupled to the first VCO output.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: January 1, 2008
    Assignee: Xilinx, Inc.
    Inventors: Moises E. Robinson, Shahriar Rokhsaz, Marwan M. Hassoun, Earl E. Swartzlander, Jr.
  • Patent number: 7119627
    Abstract: A phase-locked loop circuit comprises a voltage-controlled oscillator with at least one resonator circuit for driving the oscillator to an output frequency which is a multiple of the resonator frequency. The voltage-controlled oscillator is connected to a phase-locked loop comprising frequency control means for controlling the output frequency of the oscillator. According to the invention the resonator circuit comprises at least one adjustable component and the frequency control means are coupled into the resonator circuit for controlling the resonator frequency of the resonator circuit. The invention moreover relates to a voltage-controlled oscillator as used in this phase-locked loop circuit.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: October 10, 2006
    Assignee: Agere Systems Inc.
    Inventor: Yanling Sun
  • Patent number: 6611148
    Abstract: An insulation tester and oscillator circuit for use in same includes a transformer including a primary winding and at least one secondary winding to be coupled across an external load such as an electrode. First and second bipolar junction transistors are connected in a “push-pull” operating mode and coupled to the primary winding of the transformer for producing a high frequency voltage. The primary winding has two ends each respective one of which is coupled to a respective one of the collectors of the first and second bipolar junction transistors. First and second field effect transistors are respectively coupled in parallel with the first and second bipolar junction transistors. An actuator for activating the first and second field effect transistors to respectively conduct substantially synchronously with the first and second bipolar junction transistors shortly after start-up is provided, whereby the majority of current is shunted through the field effect transistors.
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: August 26, 2003
    Inventor: Henry H. Clinton
  • Patent number: 6608488
    Abstract: An insulation tester and oscillator circuit for use in same includes a transformer including a primary winding and at least one secondary winding to be coupled across an external load such as an electrode. First and second bipolar junction transistors are connected in a “push-pull” operating mode and coupled to the primary winding of the transformer for producing a high frequency voltage. The primary winding has two ends each respective one of which is coupled to a respective one of the collectors of the first and second bipolar junction transistors. First and second field effect transistors are respectively coupled in parallel with the first and second bipolar junction transistors. An actuator for activating the first and second field effect transistors to respectively conduct substantially synchronously with the first and second bipolar junction transistors shortly after start-up is provided, whereby the majority of current is shunted through the field effect transistors.
    Type: Grant
    Filed: November 18, 2002
    Date of Patent: August 19, 2003
    Inventor: Henry H. Clinton
  • Publication number: 20020145475
    Abstract: A dual conversion, noise resistant, digitally-controlled mm-wave frequency synthesizer for generating rapidly-tunable RF signals. The prime signal-generation source is a 3.0-3.2 GHz low noise wide band voltage controlled oscillator (“vco”). The oscillator includes a buried stripline hairpin resonator having dual-tuning circuits to increase bandwidth coverage and unique bias circuitry to improve phase noise. The oscillator frequency is multiplied by a factor of two, yielding a 6.0-6.4 GHz signal that is mixed with a fixed locally generated carrier of 3900 MHz, the output of which represents the first Intermediate Frequency (IF). This IF is then mixed with 1950 MHz (3900 MHz divided by two), yielding a second IF that covers the 188 to 550 MHz range. The 2nd IF is divided down and phase locked to an external reference using a commercially available chip set. The 6.0-6.4 phase locked signal is then re-mixed with the 3.0-3.2 GHz output form the oscillator, thereby yielding a 9.0-9.6 GHz signal. The 9.
    Type: Application
    Filed: April 10, 2001
    Publication date: October 10, 2002
    Applicant: APA Wireless Technologies
    Inventors: Eliot Fenton, Claudio Cassina, Zhong Han, Joseph Paniccia
  • Patent number: 6429748
    Abstract: There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to double the effective frequency of a ceramic coaxial resonator is to couple each end of a resonator to a Colpitts oscillator, the oscillators being balanced and out-of-phase by 180°. During operation, the resonator is effectively divided in half with a virtual ground forming in the center. This allows a single resonator to operate as two resonators of half the original size. Hence, the oscillation frequency for each of these balanced oscillators is doubled when compared to the frequency of similar oscillators that have separate ceramic coaxial resonators of similar size. If this technique is further implemented within a push-pull design tuned to the third harmonic, the output oscillation frequency becomes six times that of an oscillator using a separate ceramic coaxial resonator of similar size.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: August 6, 2002
    Assignee: Nortel Networks Limited
    Inventors: Charles T. Nicholls, Johan M. Grundlingh
  • Patent number: 6326854
    Abstract: There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to double the effective frequency of a ceramic coaxial resonator is to couple each end of a resonator to a Colpitts oscillator, the oscillators being balanced and out-of-phase by 180°. During operation, the resonator is effectively divided in half with a virtual ground forming in the center. This allows a single resonator to operate as two resonators of half the original size. Hence, the oscillation frequency for each of these balanced oscillators is doubled when compared to the frequency of similar oscillators that have separate ceramic coaxial resonators of similar size.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: December 4, 2001
    Assignee: Nortel Networks Limited
    Inventors: Charles Tremlett Nicholls, Johan M. Grundlingh
  • Patent number: 6297707
    Abstract: A microwave oscillator includes at least two active components and a dielectric resonator. The coupling between each active component and the dielectric resonator is of the transmission type and the inputs of neighboring active components are connected to a first point coupled to the resonator and likewise the outputs of the active components are connected to a second point coupled to the resonator. A push-push oscillator of the above kind is simple to produce and its operation is relatively insensitive to adjustments.
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: October 2, 2001
    Assignee: Alcatel
    Inventors: Michel Martheli, Alain Pinchon, Michel Beuzer
  • Patent number: 6275118
    Abstract: A push—push oscillator is formed by (a) a resonator circuit including a transmission line having one-half wavelength and both ends of the line being left open, and a capacitance for frequency control coupled to the transmission line in parallel, and (b) two oscillators electrically identical to each other and their input sections being coupled to both the ends of the transmission line. Further, this oscillator can take out an output signal of even-order-harmonics from a midpoint of the transmission line in a transmitting direction as well as take out two fundamental waves from respective output sections of two branch oscillators. This push—push oscillator operating with a high frequency is downsized and simplified from a conventional one. Its phase-noise-characteristics and noise immunity are also improved.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: August 14, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Noriaki Saito, Hiroyuki Yabuki
  • Publication number: 20010004225
    Abstract: There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to double the effective frequency of a ceramic coaxial resonator is to couple each end of a resonator to a Colpitts oscillator, the oscillators being balanced and out-of-phase by 180°. During operation, the resonator is effectively divided in half with a virtual ground forming in the center. This allows a single resonator to operate as two resonators of half the original size. Hence, the oscillation frequency for each of these balanced oscillators is doubled when compared to the frequency of similar oscillators that have separate ceramic coaxial resonators of similar size. If this technique is further implemented within a push-pull design tuned to the third harmonic, the output oscillation frequency becomes six times that of an oscillator using a separate ceramic coaxial resonator of similar size.
    Type: Application
    Filed: December 11, 2000
    Publication date: June 21, 2001
    Inventors: Charles T. Nicholls, Johan M. Grundlingh
  • Patent number: 6169461
    Abstract: A high-frequency oscillating circuit that is not degraded by external electromagnetic interference. The high-frequency oscillating circuit includes first and second oscillating transistors wherein the bases are connected together directly or via a capacitor having a sufficiently low impedance at an oscillating frequency, and wherein a differential signal output is obtained between the emitters of the first and second oscillating transistors. Also provided is a resonating circuit formed in a module and a separate negative-resistance-generating circuit formed on an integrated circuit for achieving an oscillator that has a high Q factor and a high C/N ratio.
    Type: Grant
    Filed: July 27, 1998
    Date of Patent: January 2, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshiaki Andoh, Makoto Sakakura, Takeshi Miura, Hiroaki Kosugi, Kaoru Ishida
  • Patent number: 5859572
    Abstract: A transmitter system for transmitting an output signal having an output level and a signal to noise ratio. The transmitter system comprises a balanced oscillator comprised of a resonator for generating a reference signal, and for creating a parasitic impedance. Moreover, the balanced oscillator comprises a first oscillator comprising a first amplifier for amplifying the reference signal, and a first feedback circuit for generating a first oscillating output signal in response to the reference signal amplified by the first amplifier. Similarly, the balanced oscillator comprises a second oscillator comprising a second amplifier for amplifying said reference signal, and a second feedback circuit for generating a second oscillating output signal in response to the reference signal amplified by the second amplifier.
    Type: Grant
    Filed: May 1, 1997
    Date of Patent: January 12, 1999
    Assignee: UT Automotive Dearborn, Inc.
    Inventor: John P. Hill
  • Patent number: 5754012
    Abstract: A circuit for sensing a current in a fluorescent lamp. A control system comprises a buck regulator circuit for supplying a buck current, an inverter circuit for receiving the buck current and for generating a lamp voltage, a circuit for sensing a current in a fluorescent lamp, and a controller for controlling the buck regulator and the inverter. The inverter comprises a Royer-type inverter, a resonant tank, and a transformer. A current flows through a primary winding of the transformer to generate a voltage in a secondary winding of the transformer. The fluorescent lamp is coupled to the secondary winding of the transformer so that the fluorescent lamp is isolated from the remainder of the control system by the transformer. The circuit for sensing the current in the lamp senses a current in the Royer-type inverter which is representative of the current in the lamp. The circuit for sensing the current in the lamp is coupled to the controller for controlling the buck regulator and the inverter.
    Type: Grant
    Filed: October 7, 1996
    Date of Patent: May 19, 1998
    Assignee: Micro Linear Corporation
    Inventors: James J. LoCascio, Urs Harold Mader
  • Patent number: 5699021
    Abstract: A balanced and buffered oscillator and transmitter arrangement includes a first and second oscillator, each of which include a resonator for generating a reference signal, an amplifier for amplifying the reference signal, a resonant tank for generating an oscillating output signal in response to the amplified reference signal, and a buffer circuit for buffering the respective oscillating output signal such that the effects of a parasitic impedance are minimized.
    Type: Grant
    Filed: April 16, 1996
    Date of Patent: December 16, 1997
    Assignee: United Technologies Automotive, Inc.
    Inventor: John P. Hill
  • Patent number: 5602515
    Abstract: In order to improve the efficiency of a self-starting high-frequency generator, where for self-starting power is fed back from the anode circuit to the control grid of the grid-controlled electron tube used as amplifier element, the following measures are provided. An additional oscillating circuit (L.sub.A3, C.sub.A3) which is tuned to a multiple of the operating frequency (f.sub.1) is arranged in the anode circuit. An oscillating circuit (L.sub.G31, L.sub.G32, C.sub.G3) tuned to a multiple of the operating frequency (f.sub.1) is likewise arranged in the control-grid circuit. Components (L.sub.G31) belonging to the feedback circuit are at the same time components of the oscillating circuit arranged in the control-grid circuit.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: February 11, 1997
    Assignee: Siemens Aktiengesellschaft
    Inventors: Michael Held, Jochen Stahl
  • Patent number: 5568095
    Abstract: The present invention teaches an oscillator and transmitter. The balanced oscillator comprises a resonator for generating a reference signal having a resonating frequency, a first oscillator for providing a first oscillating output in response to the resonating frequency, and a second oscillator for providing a second oscillating output in response to the resonating frequency. The second oscillating output has a magnitude equal to the first oscillating output while oscillating 180 degrees out of phase with the first oscillating output. The transmitter comprises an antenna for radiating the first and second oscillating output signals.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: October 22, 1996
    Assignee: United Technologies Automotive, Inc.
    Inventor: John P. Hill
  • Patent number: 5486793
    Abstract: A balanced oscillator and transmitter circuit is provided which includes a pair of balanced Colpitts-type oscillators for generating an enhanced power radiating output signal. The balanced oscillators share a series resonance input tank. Each oscillator has an amplification stage which preferably includes a Colpitts-type configured transistor. The transmitter circuit further includes first and second output tanks having first and second radiating elements which may include a pair of inductors. An oscillating current signal is generated by the oscillator and is commonly transmitted through the pair of radiating elements. Each radiating element transmits radiating output signals which are combined and summed in total to provide an efficient radiating output signal. Alternately, the first and second output tanks may include a center-tapped transformer coupled to a third radiating element.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: January 23, 1996
    Assignee: United Technologies Automatove, Inc.
    Inventor: John P. Hill
  • Patent number: 5422605
    Abstract: A low phase noise oscillator 10 having a balanced feedback transformer 24 and a push-pull resonant circuit 12 for generating an oscillation excitation signal. The resonant circuit 12 is loaded by an output buffer 20 connected between first and second feedback terminals 16 and 18. The feedback transformer 24 provides first and second feedback paths of opposite phase polarity which link the resonant circuit 12 with the first and second feedback terminals 16 and 18.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: June 6, 1995
    Assignee: Hughes Missile Systems Company
    Inventors: Steve S. Yang, Yiu-Man So
  • Patent number: 5402087
    Abstract: A voltage controlled push-push oscillator is provided having a variable frequency output over a range of frequencies. Usually, the range of frequencies is in the microwave range. The configuration is such that the collectors of a pair of transistors are tied together, and an inductive reactance is provided across the base and collector of each of the transistors, with the emitters of the pair of transistors being each connected to opposite phases (at the fundamental frequency) of a resonator which may comprise of one or more elements, bisected to provide an output tap at which an RF null at the fundamental frequency and an anti-null at the second harmonic exists, whereby the second harmonic output frequency of the push-push oscillator is derived. Particularly when the push-push oscillator operates at microwave frequencies, the resonator element is a microstrip line, having the output tap at the centre thereof.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: March 28, 1995
    Assignee: B.E.L.-Tronics Limited
    Inventor: Roman T. Gorczak
  • Patent number: 5309350
    Abstract: Here is disclosed a push-pull inverter used to drive a cold cathode discharge tube, a hot cathode discharge tube and the like, comprising a boosting transformer having a first primary coil, a first secondary coil, a second primary coil and a second secondary coil; first and second switching elements each having a control electrode adapted for controllably interrupting primary current flowing through said first and second primary coils; a capacitor connected between the respective control electrodes of the respective switching elements; and a feedback circuit in which one end of the first secondary coil is connected to the control electrode of the first switching element and one end of the second secondary coil is connected to the control electrode of the second switching element so that load current from a load connected between the other ends of the respective first and second secondary coils flows through the capacitor.
    Type: Grant
    Filed: January 6, 1993
    Date of Patent: May 3, 1994
    Assignee: Kijima Co., Ltd.
    Inventor: Seiichi Kijima
  • Patent number: 5289139
    Abstract: A push-push microwave oscillator has two branch oscillators fabricated of a transistor and transmission line elements extending from terminals of the transistor, and a resonator which is fabricated of an annulus of superconductor material and serves to phase lock oscillations of the two branch oscillators. The superconductor material is a composite of a rare earth element and copper oxide such as yttrium-barium-copper oxide. A first transmission line in each of the branch oscillators extends past the resonator with a spacing to provide for electromagnetic coupling between the branch oscillator and the resonator. A second transmission line in each of the branch oscillators has a length equal to approximately one-quarter wavelength of the oscillation frequency to tune the branch oscillator to a common oscillation frequency.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: February 22, 1994
    Assignee: Space Systems/Loral
    Inventors: Slawomir J. Fiedziuszko, John A. Curtis
  • Patent number: 5250910
    Abstract: A push-push oscillator including a resonator having a transmission line and a capacitance connected to the transmission line in parallel; an oscillating circuit responsive to the resonator for oscillating and for producing first and second outputs having an antiphase relation therebetween; an in-phase combining circuit for summing the first and second outputs of said oscillating circuit to produce a summed signal; and an antiphase combining circuit responsive to two components from the resonator having an antiphase relation for producing a differential signal in accordance with a difference between the two components. Alternatively, the in-phase combining circuit is connected to the resonator and the antiphase combining circuit is connected to the oscillating circuit. The antiphase combining circuit outputs a fundamental wave component of the resonator. The in-phase combining circuit outputs a second harmonic wave component.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: October 5, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Yabuki, Isao Ishigaki, Mitsuo Makimoto
  • Patent number: 5109328
    Abstract: This invention relates to a push-pull inverter used, for example, as a driver for cold-cathod discharge tube, hot-cathode discharge tube, etc.According to this invention, respective control electrodes of a first switching element and a second switching element are interconnected by a capacitor so that a load current passes through this capacitor and thereby alternately activates the first and second switching element.With such arrangement, a boosting transformer requires no feedback coil and it is possible to eliminate a capacitor for resonance which has conventionally been connected in parallel to a primary coil of said boosting transformer.
    Type: Grant
    Filed: October 12, 1990
    Date of Patent: April 28, 1992
    Assignee: Kijima Co., Ltd.
    Inventor: Seiichi Kijima
  • Patent number: 4996499
    Abstract: An inverting amplifier useful in an oscillator circuit includes complementary serially connected first and second metal-oxide-semiconductor field effort transistor (MOSFETS) and first and second resistors, two capacitors, a first feedback circuit having two MOSFETS in series with a third resistor and a second feedback circuit having two MOSFETS and a fourth resistor in series. Each feedback circuit provides a feed back path from the drain of one of the output transistors to the gate thereof. The resistors are polysilicon type resistors and have a negative thermal coefficient. The amplifier has a very stable output signal amplitude which is essentially independent of integrated circuit manufacturing processing variations and operating temperature variations within useful ranges.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: February 26, 1991
    Assignee: Delco Electronics Corporation
    Inventors: Seyed R. Zarabadi, Linh N. Pham
  • Patent number: 4947139
    Abstract: An improved control circuit for maintaining constant amplitude of the sinusoidal output signal of an oscillator circuit by synchronously demodulating the signal using a push-pull transistor pair operating in saturation to generate a control signal for comparison with a reference voltage in a direct coupled negative feedback loop to the oscillator. The configuration of the feedback loop provides effectively instantaneous control response to eliminate low frequency modulation propagated internally in the oscillator due to noise generation in circuit components.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: August 7, 1990
    Assignee: Tavis Corporation
    Inventor: John R. Tavis
  • Patent number: 4818953
    Abstract: An improved oscillator circuit for avoiding core saturation without the need for auxiliary magnetic devices employs an emitter resistance for regulating base voltage, and a semiconductor base shunt for initiating transistor cut-off when the base voltage increases above the threshold voltage of the semiconductor shunt, the emitter resistance being preselected to activate the base shunt before the transformer core reaches saturation.
    Type: Grant
    Filed: April 7, 1988
    Date of Patent: April 4, 1989
    Assignee: Genlyte Group, Inc.
    Inventor: Robert S. Feldstein
  • Patent number: 4763084
    Abstract: A push-push broadband dielectric resonator oscillator circuit that operates in the K and Ka band frequency range has two oscillator circuits that oscillate at the same fundamental frequency. An antiphaseal relationship is maintained between the two oscillators through the use of a dielectric resonator and the desired frequency is obtained by vectorially combining the output signals of the two oscillators that have the antiphase relationship to obtain an output frequency that is twice the fundamental frequency of operation of each of the individual dielectric resonator oscillator circuits.
    Type: Grant
    Filed: April 9, 1987
    Date of Patent: August 9, 1988
    Assignee: Texas Instruments Incorporated
    Inventors: Anthony M. Pavio, Jr., Mark A. Smith
  • Patent number: 4704561
    Abstract: A push-pull generator with a driver stage and a push-pull output stage. A parallel connection of a resistor (R3, R4) with a control transistor (T3, T4) is provided in the base line of each output stage transistor. In the push-pull output stage, resistors (R1, R2) are provided at which a voltage drop is caused by the output stage current. Depending on the magnitude of the voltage drop the control transistors (T3, T4) located parallel to the resistors in the base lines are either activated or blocked.
    Type: Grant
    Filed: February 3, 1986
    Date of Patent: November 3, 1987
    Assignee: Telefunken electronic GmbH
    Inventor: Joachim Dietl
  • Patent number: 4532439
    Abstract: A logic circuit comprises a first and second circuit. The first circuit consists of at least one first conductivity-type MOSFET having a gate connected to an input terminal, and having a first current path connected at one end to an output terminal. The second circuit consists of at least one second conductivity-type MOSFET having a gate is connected to the input terminal, and having a second current path connected at one end to the output terminal. The logical circuit further comprises a depletion-type MOSFET of the second conductivity type and a depletion-type MOSFET of the first conductivity type. The depletion-type MOSFET of the second conductivity type has a threshold voltage the absolute value of which is larger than that of the first conductivity-type MOSFET, has a current path connected between the other end of the first current path and a first power source, and has a gate connected to the output terminal.
    Type: Grant
    Filed: September 2, 1983
    Date of Patent: July 30, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Hideharu Koike
  • Patent number: 4527130
    Abstract: A push-pull microwave oscillator circuit, including two transistors, for producing the second harmonic of a fundamental frequency at a symmetry point of the circuit which is connected to the bases of the transistors through identical arrangements of circuit elements. The circuit includes tuning means coupled to at least one of the transistors, an output and an input. The output, which is utilized to provide to a phase comparison means an output signal at the fundamental of the second harmonic frequency, is coupled to the base of at least one of the transistors by a capacitive impedance. The input, which is utilized to receive a tuning signal produced by the phase comparison means in response to the output signal, is coupled to the tuning means.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: July 2, 1985
    Assignee: U.S. Philips Corporation
    Inventor: Georg Lutteke
  • Patent number: 4513226
    Abstract: An electronic ballast-inverter circuit for powering one or more fluorescent lamps or the like includes two identical circuits operating at different DC offsets, each circuit including a tank circuit composed of a primary winding of the power transformer and a capacitor such that each tank circuit resonates at the same frequency, and including a switching transistor connected to each tank circuit. These two transistors are operative on alternate half cycles of the sine wave generated by the inverter, so as to obtain the push-pull operation needed by the inverter. Each circuit includes a base drive current source for each transistor that is controlled by the polarity of an additional primary winding of the power transformer. For improved efficiency, the circuit is designed to be operable from an unsmoothed DC voltage source.
    Type: Grant
    Filed: March 4, 1983
    Date of Patent: April 23, 1985
    Assignee: Astec Components, Ltd.
    Inventor: Elliot Josephson
  • Patent number: 4453269
    Abstract: A novel apparatus and method for improving the stability of an electrical circuit such as an oscillator and/or a radio frequency transmitter which is coupled to a radiating element wherein the radiating element such as a loop is coupled to the inductor or capacitor of the frequency determining circuit of the oscillator so that frequency shifts will not occur due to inductive or capacitive effects. The oscillator circuit is mounted on an insulating sheet which has a ground plane on the opposite side thereof so as to provide effective shielding and the radiating element is mounted on a portion of the insulating sheet where the grounding plane does not extend. The radiating element is also coupled symmetrically to the inductor or capacitors of the frequency determining circuit and is connected at tap points which do not have the entire inductance between them.
    Type: Grant
    Filed: September 22, 1982
    Date of Patent: June 5, 1984
    Assignee: Chamberlain Manufacturing Corporation
    Inventor: Robert C. Skar
  • Patent number: 4434457
    Abstract: A solid-state power generator or inverter for operating a load such as one or more gas discharge lamps from a DC or rectified AC power source includes two principal circuits, one being a drive circuit with pulse formation derived by negative feedback and the other being an inductively driven or dependent circuit with pulse formation by positive and negative feedback. The circuits operate in 180.degree. phase relationship. The circuits as disclosed are identical except for a capacitor in the first which is not present in the second. The circuits are coupled by a five-winding nonsaturable core transformer in which DC pulses passing through two primary windings induce in one secondary winding a sinusoidal EMF proportional to the product of the two primary currents and, in turn, proportional current flows in the load. Open circuit protection is also provided.
    Type: Grant
    Filed: October 27, 1981
    Date of Patent: February 28, 1984
    Inventor: Guido Arena-Ochoa
  • Patent number: 4360790
    Abstract: An oscillator arrangement is disclosed which is controllable in its frequency and which comprises a control input for frequency variation and a transformer output, whose frequency-determining oscillating circuit possesses, as a controllable reactive element, two varactor diodes which are connected in opposing fashion and whose capacitance largely represents the oscillating circuit capacitance. Two feedback oscillator circuits are combined to form a push-pull circuit in that the output terminals of the oscillator circuits are connected in respect of d.c. to a reference potential by way of a central tap of the primary winding of a common output transformer. In addition, the two varactor diodes are oppositely poled and interconnected in respect of d.c.
    Type: Grant
    Filed: March 20, 1980
    Date of Patent: November 23, 1982
    Assignee: Siemens Aktiengesellschaft
    Inventor: Rudolf Heise
  • Patent number: 4336509
    Abstract: The oscillation generator includes an oscillator circuit, a push-pull amplifier with inductive positive feedback connected in the circuit, a piezoceramic atomizer vibrator element, and a load-dependent regenerative feedback coupling connected to the circuit. The coupling is in the form of a tunable frequency-selective sensor having outputs connected to the inputs of the amplifier.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: June 22, 1982
    Assignee: Bosch-Siemens Hausgerate GmbH
    Inventor: Franz Bernitz
  • Patent number: 4277726
    Abstract: A novel transistorized fluorescent lamp ballast and lamp combination operates from AC line voltage. The ballast provides for "soft-start" lamp operation in one featured aspect and provides for some lamp light output regulation in another featured aspect thereof.
    Type: Grant
    Filed: August 28, 1978
    Date of Patent: July 7, 1981
    Assignee: Litton Systems, Inc.
    Inventor: Robert V. Burke
  • Patent number: 4258337
    Abstract: The oscillator includes a high gain differential amplifier, the output of which alternately drives two sets of transistors which together provide the oscillator output signal. A first set of transistors operates during one-half cycle of the output while the other set is operating during the other half-cycle. A DC feedback path provides degenerative DC feedback to minimize the DC component of the output signal, while an AC feedback path, which includes a filter network which passes the circuit operating frequency at a 180.degree. phase shift relative to the phase of the output signal, provides regenerative AC feedback to maintain circuit oscillation.
    Type: Grant
    Filed: September 10, 1979
    Date of Patent: March 24, 1981
    Assignee: Huntron Instruments, Inc.
    Inventor: James R. Clinton
  • Patent number: 4211985
    Abstract: In oscillators such as those used in electronic watches, low power consumption is quite desirable. To accomplish this, an oscillator is provided including a complementary inverter amplifier circuit comprising a complementary inverter including a p-channel MIS FET connected to a first source potential, an n-channel MIS FET connected to a second source potential, and the gate of the two FETs being applied with a common linear input. Respective load resistors are connected to the drains of the complementary FETs, an output being derived from the interconnection point of the load resistors or from the drains of the FETs. Further, a bias resistor is connected between the gate and the drain of each of the complementary FETs, the input being supplied to the gates of the FETs through respective capacitors. The p-channel FET and n-channel FET are individually biased so that the circuit may serve as a class B push pull amplifier of low power consumption.
    Type: Grant
    Filed: April 26, 1978
    Date of Patent: July 8, 1980
    Assignee: Hitachi, Ltd.
    Inventor: Osamu Yamashiro
  • Patent number: 4169248
    Abstract: An oscillating circuit provides first and second reference signals having a phase difference of 90.degree. with respect to each other. The oscillating circuit includes an oscillator providing the first reference signal at an output thereof, a voltage-to-current converting circuit, which may incorporate a common-base transistor, and a capacitor connected between the output of the oscillator and an input of the converting circuit. The output of the converting circuit then provides the second reference signal which differs in phase by 90.degree. from the first reference signal. The oscillator may include differentially connected transistors and an LC resonant circuit.
    Type: Grant
    Filed: March 6, 1978
    Date of Patent: September 25, 1979
    Assignee: Sony Corporation
    Inventors: Masayuki Hongu, Hiromi Kawakami, Yoshihiro Yamamoto, Masaharu Tokuhara