Abstract: An AT-cut crystal element includes a vibrator and a supporting portion. The vibrator has a planar shape with an approximately rectangular shape. The supporting portion is connected to one short side of the vibrator and has a thickness thicker than a thickness of the vibrator. The AT-cut crystal element has an oscillation frequency of approximately 76 Mhz. The vibrator has a distal end portion that is an end portion on a side opposite to the supporting portion. The distal end portion is formed to have a protrusion shape toward a distal end side thereof. The vibrator has both ends formed to have a protrusion shape toward an outside direction along the short side. The vibrator has a long side dimension L and a short side dimension W. A W/L is in a range of 0.74 to 0.79 or in a range of 0.81 to 0.93.

Abstract: Acoustic resonator devices, filter devices, and methods of fabrication are disclosed. A resonator device includes a single-crystal piezoelectric plate having a front surface and a back surface opposite the front surface, wherein the back surface is coupled to a surface of a substrate. A floating back-side conductor pattern is formed on a portion of the back surface. A front-side conductor pattern including two electrodes is formed on a portion of the front surface opposite the back-side conductor.

Abstract: A quartz crystal resonator unit includes a quartz crystal substrate, first and second excitation electrodes, first and second conductive sealing members, and first and second exterior members. The first excitation electrode is disposed on a first main surface of the substrate with the first conductive sealing member surrounding the first excitation electrode. Similarly, the second excitation electrode is disposed on a second main surface of the substrate with the second conductive sealing surrounding the second excitation electrode. The first and second exterior members are bonded to the quartz crystal substrate with the first and second conductive sealing member respectively interposed therebetween and to cover the first and excitation electrodes, respectively. In a plan view of the first main surface of the substrate, at least part of the first conductive sealing member is located outward of the second conductive sealing member.

Abstract: A piezoelectric device includes a piezoelectric element, a package, a temperature sensitive component and a conductive adhesive. The package includes a base body and a connection conductor. The base body has electric insulation and configures a space. The space is sealed and holds the piezoelectric element. The connection conductor is located on a predetermined surface of the base body. The predetermined surface is on an outer side relative to the space. The temperature sensitive component includes apart terminal and converts temperature to an electrical signal. The conductive adhesive is configured by a thermosetting resin containing a conductive filler and is bonded to the connection conductor and the part terminal.

Abstract: A crystal device includes a rectangular shaped substrate, a mounting frame which is along an outer circumferential edge of a lower surface of the substrate on its short-side sides and configures a recessed part, electrode pads on an upper surface of the substrate, connection pads on the lower surface of the substrate in the mounting frame, a crystal element mounted on the electrode pads, a temperature sensing element mounted on the connection pads, and a lid air-tightly sealing the crystal element. The electrode pads and the recessed part do not overlap in a plane perspective view.

Abstract: In a crystal unit, a substrate is rectangle-shaped. A frame includes a pair of portions located in regions on the sides of a pair of short sides of the substrate on the lower surface of the substrate and forms a concave portion between these pair of portions. An electrode pad is located on the upper surface of the substrate. A connection pad is located on the lower surface of the substrate within the frame. A plurality of external terminals are located on the lower surface of the frame. A crystal element is mounted on the electrode pad. A temperature sensing element is mounted on the connection pad. A ratio S2/S1 of an area S1 of a rectangular region formed by an outer edge of the lower surface of the frame and an area S2 of a smallest rectangular region containing all of the external terminals is 0.75 to 0.91.

Abstract: A tuning fork-type vibration piece is provided, in which a cushioning portion is formed on the base of a package to make contact with abutting portions of arm portions which are any parts but their edges, and the abutting portions of the arm portions allowed to contact the cushioning portion are electrodeless regions including no electrode, which prevents the risk of frequency fluctuations that may occur in case an electrode is chipped off by possible contact with the cushioning portion.

Abstract: A sensor comprising a resonator structure arranged for resonating along a first plane; and at least one sensing electrode arranged on a second plane parallel to said first plane at a predetermined distance of said resonator structure along a direction normal to said first plane.

Abstract: A quartz crystal unit that includes a quartz crystal resonator with a quartz crystal blank on which a pair of excitation electrodes are formed, a frame body that surrounds an outer periphery of the blank, and a coupling member that couples the frame body to the blank. Moreover, a package member is joined to an entire periphery of the frame body on at least one side of the excitation electrodes; and an extension electrode is provided that is electrically connected to one of the excitation electrodes. A recess is formed in a junction region of at least one of the frame body and the package member. In the junction region, the extension electrode is disposed in the recess in such a way that the extension electrode has a thickness that does not exceed a depth of the recess.

Abstract: Embodiments of the disclosure are drawn to a low-voltage temperature sensor. The temperature sensor may include a waveform generator, a complementary-to-absolute-temperature (CTAT) voltage generator, a voltage reference, two comparators, and digital logic. A waveform of the waveform generator may be compared to both the CTAT voltage and the voltage reference. The output of the comparison of the CTAT and the waveform may be a pulse-width modulated signal that is temperature-dependent. The output of the comparison of the voltage reference and the waveform may be a signal with constant pulse width. The digital logic may receive the pulsed signals and take a ratio of the two signals to determine a temperature.

Abstract: Disclosed is a Bragg mirror, a resonator and a filter device comprised thereof. The Bragg mirror comprises a stack of plurality of layers arranged in an axial direction, wherein the plurality of layers comprises at least one first layer comprising, in a radial direction, a first material and a second material, wherein the first material is a first metal and the second material is a different material with respect to the first material, and wherein the first material is radially embedded by the second material in the first layer, or vice versa. The resonator comprises a top electrode, a bottom electrode, a piezo electric layer arranged between the top electrode and the bottom electrode, a substrate, and a Bragg mirror arranged between the bottom electrode and the substrate.

Abstract: A moveable micromachined member of a microelectromechanical system (MEMS) device includes an insulating layer disposed between first and second electrically conductive layers. First and second mechanical structures secure the moveable micromachined member to a substrate of the MEMS device and include respective first and second electrical interconnect layers coupled in series, with the first electrically conductive layer of the moveable micromachined member and each other, between first and second electrical terminals to enable conduction of a first joule-heating current from the first electrical terminal to the second electrical terminal through the first electrically conductive layer of the moveable micromachined member.

Abstract: An acoustic resonator includes a piezoelectric stack including a piezoelectric layer having a top surface and a bottom surface, a top electrode layer disposed above the top surface, and a bottom electrode layer disposed below the bottom surface. A number of acoustic wave reflectors are disposed on a side of the bottom electrode layer opposite the piezoelectric layer. Each acoustic wave reflector includes a high acoustic impedance layer and may include a low acoustic impedance layer. The acoustic resonator may include a tether that extends laterally to a stacking direction of the layers of the piezoelectric stack. A supporting structure may be coupled to the tether opposite the acoustic resonator for anchoring the acoustic resonator. A mirror, one or more phononic crystals, or both may be positioned on proximate the tether opposite the acoustic resonator to avoid resonant waves from exiting the acoustic resonator in use.

Abstract: An apparatus injects a start clock to a crystal at the beginning to increase an overall start up speed of the crystal. The apparatus relies on an impedance change inside the crystal itself instead of searching for a synchronization on the yet small crystal oscillation. The apparatus includes an oscillator (separate from the crystal) to search for the crystal's resonance frequency by detecting the crystal's impedance change. Once the frequency of the oscillator matches the crystal's resonance, there is significant change in the crystal's impedance. Using that information, the apparatus can lock the oscillator frequency at the crystal resonance frequency and inject the clock with high efficiency.

Abstract: A piezoelectric oscillator includes a base member; a piezoelectric resonator mounted on an upper surface of the base member; a lid member joined to the upper surface so as to hermetically seal the piezoelectric resonator; an electronic component mounted on a lower surface of the base member; a mounting frame joined to the lower surface so as to surround the electronic component; and a heat conduction path disposed on the base member and/or the mounting frame. The heat conduction path is electrically isolated from both of the piezoelectric resonator and the electronic component in the piezoelectric oscillator and has heat conductivity. The heat conduction path includes a first heat conduction portion inside where the base member and the mounting frame overlap, and a second heat conduction portion connected to the first heat conduction portion and disposed outside where the base member and the mounting frame overlap.

Abstract: A vibrator device includes abase, a circuit element that is attached to the base, and a vibrator element that is arranged at an active surface of the circuit element and is attached to the circuit element, and the circuit element includes a terminal for frequency adjustment that is used for frequency adjustment of the vibrator element and is disposed in a region that does not overlap the vibrator element when viewed in a plan view of the active surface.

Abstract: The present disclosure relates to a method of analyzing a pulse modulated signal, wherein the method comprises: receiving a pulse modulated signal; determining a dynamic threshold level based on a period of the pulse modulated signal and the pulse modulated signal; and demodulating the pulse modulated signal by the dynamic threshold level. Moreover, a signal analysis instrument for analyzing a pulse modulated signal is described.

Abstract: A micromechanical system (MEMS) resonator includes a base substrate. A piezoelectric layer has a first electrode attached to a first surface of the piezoelectric layer and a second electrode attached to a second surface of the piezoelectric layer opposite the first electrode. The first electrode is bounded by a perimeter edge. A patterned acoustic mirror is formed on a top surface of the first electrode opposite the piezoelectric layer, such that the patterned acoustic mirror covers a border strip of the top surface of the first electrode at the perimeter edge and does not cover an active portion of the top surface of the first electrode.

Abstract: Aspects of the disclosure are directed to a low power differential circuit. In accordance with one aspect, the low power differential circuit includes a crystal oscillator to generate a differential sinusoidal waveform, the crystal oscillator having a first terminal and a second terminal; a first capacitor coupled to the first terminal; a first inverter including a first input coupled to the first terminal and a first output coupled to the first capacitor; a second capacitor coupled to the second terminal; and a second inverter including a second input coupled to the second terminal and a second output coupled to the second capacitor, wherein the first inverter and the second inverter generate a synchronous square wave signal.

Abstract: A temperature-compensated microelectromechanical oscillator and a method of fabricating thereof. The oscillator includes a resonator element including highly doped silicon and an actuator for exciting the resonator body into a resonance mode having a characteristic frequency-vs-temperature curve. The properties of the resonator element and the actuator are chosen such that the curve has a high-temperature turnover point at a turnover temperature of 85° C. or more. In addition, the oscillator comprises a thermostatic controller for keeping the temperature of the resonator element at said high turnover temperature.