Piezoelectric Crystal In Bridge Patents (Class 331/139)
  • Patent number: 9257917
    Abstract: The EFFICIENT POWER CONVERSION APPARATUSES, METHODS AND SYSTEMS include circuits for efficiently converting electrical energy to mechanical energy and vice-versa, such as within a multitude of ElectroActive Polymer (EAP) transducers. Embodiment may support a multitude of EAP transducers while also being capable of directing the movement of energy between electrical and mechanical forms in either direction. In another aspect, an efficient mode of transferring mechanical energy is discussed, via one or more strained and paired elastic transducers coupled to a potential energy reservoir.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: February 9, 2016
    Assignee: Pliant Energy Systems LLC
    Inventors: Benjamin Pietro Filardo, William J. Bowhers, Baoxiang Shan
  • Patent number: 8760231
    Abstract: A piezoelectric device includes an integrated circuit (IC) chip and a piezoelectric resonator element, a part of the piezoelectric resonator element being disposed so as to overlap with a part of the IC chip when viewed in plan. The IC chip includes: an inner pad disposed on an active face and in an area where is overlapped with the piezoelectric resonator when viewed in plan; an insulating layer formed on the active face; a relocation pad disposed on the insulating layer and in an area other than a part where is overlapped with the piezoelectric resonator element, the relocation pad being coupled to an end part of a first wire; and a second wire electrically coupling the inner pad and the relocation pad, the second wire having a relocation wire and a connector that penetrates the insulating layer, the relocation wire being disposed between the insulating layer and the active face.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: June 24, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Kazuhiko Shimodaira
  • Patent number: 8471643
    Abstract: Electromechanical systems resonator structures, devices, circuits, and systems are disclosed. In one aspect, an oscillator includes an active component and a passive component connected in a feedback configuration. The passive component includes one or more contour mode resonators (CMR). A CMR includes a piezoelectric layer disposed between a first conductive layer and a second conductive layer. The conductive layers include an input electrode and an output electrode. The passive component is configured to output a first resonant frequency and a second resonant frequency, which is an odd integer harmonic of the first resonant frequency. The active component is configured to output a signal including the first resonant frequency and the second resonant frequency. This output signal can be a substantially square wave signal, which can serve as a clock in various applications.
    Type: Grant
    Filed: May 13, 2011
    Date of Patent: June 25, 2013
    Assignee: QUALCOMM MEMS Technologies, Inc.
    Inventors: Jonghae Kim, Je-Hsiung Lan, Changhan Yun, Chi Shun Lo, Matthew Nowak
  • Patent number: 8193869
    Abstract: A device has a resonator coupled to input and output nodes, the resonator being characterized by a transducer to drive the output node, and further characterized by a feedthrough capacitance such that portions of the input signal bypass the transducer to allow a spurious signal to reach the output node. The device includes a compensation capacitor coupled to the output node to define a compensation capacitance in accordance with the feedthrough capacitance. A phase inversion circuit is coupled to the compensation capacitance to generate a compensation signal and coupled to the output node such that the spurious signal is offset by the compensation signal. In some cases, a differential amplifier of the phase inversion circuit has the compensation capacitance in a feedback path to offset the feedthrough capacitance. In these and other cases, the compensation capacitance and the feedthrough capacitance may be unmatched to avoid overcompensation.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: June 5, 2012
    Assignee: Discera, Inc.
    Inventors: Andrew R. Brown, Wan-Thai Hsu, Kenneth R. Cioffi
  • Patent number: 7804374
    Abstract: A device has a resonator coupled to input and output nodes, the resonator being characterized by a transducer to drive the output node, and further characterized by a feedthrough capacitance such that portions of the input signal bypass the transducer to allow a spurious signal to reach the output node. The device includes a compensation capacitor coupled to the output node to define a compensation capacitance in accordance with the feedthrough capacitance. A phase inversion circuit is coupled to the compensation capacitance to generate a compensation signal and coupled to the output node such that the spurious signal is offset by the compensation signal. In some cases, a differential amplifier of the phase inversion circuit has the compensation capacitance in a feedback path to offset the feedthrough capacitance. In these and other cases, the compensation capacitance and the feedthrough capacitance may be unmatched to avoid overcompensation.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: September 28, 2010
    Assignee: Discera, Inc.
    Inventors: Andrew R. Brown, Wan-Thai Hsu, Kenneth R. Cioffi
  • Patent number: 6544331
    Abstract: A crystal oscillator and method for manufacturing same including excitation electrode portions formed upon a crystal substrate and thus forming an excitation portion of the area defined between the electrode portions. Axis inversion portions possess an electrical axis (−X) opposite to the electrical axis (X) of the excitation portion, these axis inversion portions being formed within the crystal substrate at a position other than that of the excitation portion. A stable resonance frequency and filter frequency can be obtained even under conditions of ambient temperature fluctuation, by means of a relatively simple temperature compensation circuit, wherein handling is easy and no complicated adjustment is necessary, and low costs can be realized.
    Type: Grant
    Filed: May 18, 1999
    Date of Patent: April 8, 2003
    Assignee: Mitsubishi Materials Corporation
    Inventor: Takehiko Uno
  • Publication number: 20020158698
    Abstract: An operational amplifier oscillator uses an operational amplifier as a low impedance driver for a resonator, the output from the operational amplifier being a voltage signal at the desired frequency. The operational amplifier has positive and negative feedback paths, with the negative feedback path having a first resistor for driving the impedance at the negative input to a small value when the voltage signal is near a zero crossing and an anti-parallel diode limiter in parallel with the first resistor with an optional series second resistor for driving the impedance at the negative input even smaller when the voltage signal swings away from zero. The positive feedback loop includes a series diode limiter or optional voltage divider. Phase noise is minimized by coupling a filter between the output and the positive feedback path to block the low frequency noise from the positive input of the amplifier.
    Type: Application
    Filed: April 27, 2001
    Publication date: October 31, 2002
    Inventor: Linley F. Gumm
  • Patent number: 6472945
    Abstract: An operational amplifier oscillator uses an operational amplifier as a low impedance driver for a resonator, the output from the operational amplifier being a voltage signal at the desired frequency. The operational amplifier has positive and negative feedback paths, with the negative feedback path having a first resistor for driving the impedance at the negative input to a small value when the voltage signal is near a zero crossing and an anti-parallel diode limiter in parallel with the first resistor with an optional series second resistor for driving the impedance at the negative input even smaller when the voltage signal swings away from zero. The positive feedback loop includes a series diode limiter or optional voltage divider. Phase noise is minimized by coupling a filter between the output and the positive feedback path to block the low frequency noise from the positive input of the amplifier.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: October 29, 2002
    Assignee: Tektronix, Inc.
    Inventor: Linley F. Gumm
  • Patent number: 6169459
    Abstract: An active bridge oscillator is formed from a differential amplifier where positive feedback is a function of the impedance of one of the gain elements and a relatively low value common emitter resistance. This use of the nonlinear transistor parameter h stabilizes the output and eliminates the need for ALC circuits common to other bridge oscillators.
    Type: Grant
    Filed: May 19, 1999
    Date of Patent: January 2, 2001
    Assignee: Sandia Corporation
    Inventor: Kurt O. Wessendorf
  • Patent number: 5708394
    Abstract: An apparatus and method are disclosed for improving the stability of the frequency of vibration of an oscillator signal produced by an oscillator circuit. In a preferred embodiment of the present invention, a quartz crystal resonator is one arm of a bridge which generates a bridge signal which varies in accordance with the vibrating frequency of the resonator. A synchronous demodulator responds to the bridge signal for producing an error signal which is converted into a control signal. A control circuit receives the control signal and changes its reactance when the resonator is no longer vibrating at its unperturbed resonance frequency so that the vibration frequency of the resonator connected to the control circuit is returned to its resonant frequency. An automatic level control circuit is also included for controlling the drive level of the signal exciting the resonator.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: January 13, 1998
    Assignee: Hewlett-Packard Company
    Inventor: Richard K. Karlquist
  • Patent number: 4782309
    Abstract: A crystal oscillator in a bridge circuit coupled to a differential amplifier. Coordinated adjustment of one or two arms of the bridge permits pulling of the crystal's operating frequency both above and below its series resonant frequency.
    Type: Grant
    Filed: June 26, 1987
    Date of Patent: November 1, 1988
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Albert Benjaminson
  • Patent number: 4734659
    Abstract: In an ultrasonic oscillator which comprises an ultrasonic vibrator for driving an ultrasonic vibrator horn of an ultrasonic atomizer, a balanced circuit in which the ultrasonic vibrator is connected so that a balanced condition is established with respect to the damping capacity of the ultrasonic vibrator, and amplifier means for sending a signal to the balanced circuit and which includes a feedback circuit for positively feeding back the signal output from the balanced circuit, the feedback circuit is connected to means for adjusting the feedback quantity so that, when the ultrasonic oscillator starts the oscillation, the signal feedback quantity output from the balanced circuit is adjusted to make the gain of the amplifier means much greater than 1, and when the oscillator is in the steadily oscillating condition, the signal feedback quantity output from the balanced circuit is adjusted to broaden the allowable frequency band width of the ultrasonic vibrator.
    Type: Grant
    Filed: April 2, 1987
    Date of Patent: March 29, 1988
    Assignees: Ultrasonic Engineering Co., Ltd., Toa Nenryo Kegyo Kabushiki Kaisha
    Inventors: Yasuhisa Tanaka, Hiroyuki Takezi, Masami Endoh, Makoto Yoneda
  • Patent number: 4594573
    Abstract: A reverberation sound generator is provided for use as a warning generator for giving a warning to the driver of an automobile, for example. The reverberation sound generator has a capacitor connected in series with a power supply, a pair of diodes and a pair of resistors connected in series with the capacitor, and a sound generator circuit connected between the pair of diodes and the pair of resistors. A sound generation command switch is joined in series with the diodes and resistors. There is a circuit for discharging the capacitor. The capacitor can be controlled in its charging and discharging in response to closing and opening of the sound generation switch. When the capacitor is charged and discharged, the sound generator circuit produces reverberation sounds, respectively.
    Type: Grant
    Filed: January 19, 1983
    Date of Patent: June 10, 1986
    Assignee: Nippondenso Co., Ltd.
    Inventors: Muneki Yoshino, Toshitaka Tanahashi
  • Patent number: 3993962
    Abstract: A low noise frequency source utilizes a varactor diode to form a parametric crystal oscillator which may be frequency multiplied to the desired microwave frequency, for radar applications.
    Type: Grant
    Filed: August 18, 1975
    Date of Patent: November 23, 1976
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Francis W. Hopwood, Lester K. Staley, Thomas R. Turlington