Abstract: A vibrating element includes a base and a first vibrating arm and a second vibrating arm extending from the base. The first vibrating arm includes a first arm and a first weight. The second vibrating arm includes a second arm and a second weight. In the vibrating element, 0.952<M2/M1<1.000, wherein M1 is mass on the second vibrating arm side of the first weight with respect to a first center line of the first arm and mass on the first vibrating arm side of the second weight with respect to a second center line of the second arm and M2 is mass on a side opposite to the second vibrating arm of the first weight with respect to the first center line and mass on a side opposite to the first vibrating arm of the second weight with respect to the second center line.

Abstract: An inertia measurement device, which is used in combination with a satellite positioning receiver that outputs a positioning result at every T seconds in a positioning system equipped on a vehicle, when a Z-axis angular velocity sensor, a position error P[m] based on the detection signal of the Z-axis angular velocity sensor while the vehicle moves at a moving speed V[m/sec] for T seconds satisfies Pp?P=(V/Bz)×(1?cos(Bz×T)) (where, a bias error of the Z-axis angular velocity sensor is Bz[deg/sec] and a predetermined allowable maximum position error during movement for T seconds is Pp[m]), and a bias error Bx and By of the Y-axis angular velocity sensor satisfies Bz<Bx and Bz<By.

Abstract: A circuit device includes an oscillation circuit that generates an oscillation signal by using a vibrator, a frequency adjustment circuit that adjusts an oscillation frequency of the oscillation circuit based on frequency adjustment data, a temperature sensor circuit that outputs temperature data, an arithmetic operation circuit, and a storage circuit. The arithmetic operation circuit outputs converted temperature data by performing, on the temperature data, conversion processing in which a slope of the converted temperature data with respect to the temperature data in a first temperature range is different from a slope of the converted temperature data with respect to the temperature data in a second temperature range. The storage circuit stores a lookup table representing a correspondence between the converted temperature data and the frequency adjustment data.

Abstract: An oscillator circuit includes an amplifying unit and a first feedback resistor. The amplifying unit includes an inverter at an input stage being connected to the one end of a crystal resonator, an inverter at an output stage being connected to the other end of the crystal resonator, and a linear amplifier. The linear amplifier is connected between an output terminal of the inverter at the input stage and an input terminal of the inverter at the output stage. The linear amplifier includes at least one inverter and a second feedback resistor. The second feedback resistor is connected in parallel to the at least one inverter. The linear amplifier has a conductance with a magnitude larger than a conductance of the inverter at the input stage and equal to or less than a conductance of the inverter at the output stage.

Abstract: A micro crystal oscillator includes: a tank body including a tank bottom and a side wall, the tank bottom including an inner surface and an outer surface, wherein the side wall is disposed on a periphery of the inner surface of the tank bottom to form a recess together with the tank bottom; a plurality of patterned electrodes arranged on the outer surface; a first patterned circuit arranged on the side wall; a plurality of vias disposed in the tank body for electrically connecting at least one of the patterned electrodes to the first patterned circuit; an oscillating chip arranged on the inner surface and located in the recess; and a plurality of connecting wires located in the recess and respectively connected to the oscillating chip and the first patterned circuit in a wire bonding manner; wherein the micro crystal oscillator is of millimeter level.

Abstract: An oscillator includes: an outer package; an inner package accommodated in the outer package and fixed to the outer package via a heat insulating member; a vibration element accommodated in the inner package; a temperature sensor; a first circuit element accommodated in the inner package and including an oscillation circuit configured to oscillate the vibration element and generate a temperature-compensated oscillation signal based on the temperature sensor; and a second circuit element fixed to the outer package and including a frequency control circuit configured to control a frequency of the oscillation signal.

Abstract: An oscillator circuit includes an oscillating circuit coupled to a vibrator, and a control circuit that controls the oscillating circuit. The oscillator circuit has a normal operation mode in which the oscillating circuit oscillates in a state where a negative resistance value is a first value, and a start mode in which the oscillator circuit shifts from a state where oscillation is stopped to the normal operation mode. In the start mode, the control circuit controls the negative resistance value to increase from a second value which is smaller than the first value.

Abstract: Provided is a thermal flow rate meter capable of individually correcting different pulsation errors generated in an upstream side temperature sensor and a downstream side temperature sensor. A thermal flow rate meter 1 which measures a flow rate of a gas based on a temperature difference between an upstream side temperature sensor 12 and a downstream side temperature sensor 13, which are arranged on the upstream side and the downstream side of a heating element 11. The thermal flow rate meter includes: a detection element 10 that individually outputs an output signal of the upstream side temperature sensor 12 and an output signal of the downstream side temperature sensor 13; and compensator 20 that individually performs response compensation of the output signal of the upstream side temperature sensor 12 and the output signal of the downstream side temperature sensor 13.

Abstract: An oscillator includes: a bulk-acoustic wave (BAW) resonator having a first BAW resonator terminal and a second BAW resonator terminal; and an active circuit coupled to the first and second BAW resonator terminals and having a series resonance topology with: a first transistor; a second transistor; a first resistor; a second resistor; a capacitive network coupled to first and second BAW resonator terminals and to respective current terminals of the first and second transistors; and an inductor having a first inductor terminal and a second inductor terminal, the first inductor terminal coupled to the capacitive network, and the second inductor terminal coupled to ground terminal.

Abstract: An oscillator circuit comprises a crystal oscillator arranged to generate an oscillation signal, a bias current generator arranged to supply a bias current to the crystal oscillator, and a feedback stage arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator is arranged to: in response to a supply of power to the oscillator circuit being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator, supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.

Abstract: In a crystal oscillator, a crystal resonator and an IC chip are hermetically sealed in a package. The crystal resonator includes: a crystal resonator plate including a first excitation electrode formed on a first main surface, and a second excitation electrode, which makes a pair with the first excitation electrode, formed on a second main surface; a first sealing member covering the first excitation electrode of the crystal resonator plate; and a second sealing member covering the second excitation electrode of the crystal resonator plate. A vibrating part including the first excitation electrode and the second excitation electrode of the crystal resonator plate is hermetically sealed by bonding the first sealing member to the crystal resonator plate, and the second sealing member to the crystal resonator plate.

Abstract: A system is provided for providing vibration isolation and acceleration compensation for a device such as a vibration-sensitive oscillator or sensor. The system has an assembly that moves or vibrates relative to an external component. The assembly includes a plurality of components mounted to either side of a PCB. One or more accelerometers are configured to detect acceleration of the PCB in at least one of an X-axis direction, a Y-axis direction, and a Z-axis direction. The system includes plurality of isolators coupled to the assembly and configured to isolate or dampen vibrations that would otherwise transfer to the assembly from an underlying component to which the assembly is configured to attach to. In certain embodiments, the isolators are located between the assembly and the underlying component within vertical confines of an exterior perimeter of the PCB.

Abstract: An oscillator circuit comprises a crystal oscillator and an inverter. The input of the inverter is connected to the first terminal of the crystal oscillator and the output of the inverter is connected to the second terminal of the crystal oscillator, oscillator circuit is arranged to operate the inverter in its linear operating region. An amplitude regulator has an input connected to the input of the inverter, arranged to provide a first supply current IAREG to the inverter, where the magnitude of the first supply current is inversely dependent on a magnitude of a voltage at the inverter input. A digital-to-analogue converter is arranged to provide a second supply current IDAC to the inverter having a magnitude determined by a digital signal applied to a digital input of the digital-to-analogue converter.

Abstract: A controller and system for tuning a voltage tunable capacitor is provided. The controller may include at least one analog-to-digital converter configured to receive at least one input signal and convert the at least one input signal into at least one digital signal. The controller may include a processor configured to process the at least one digital signal using logic to generate an output signal. The controller may include a charge pump configured to boost the output signal to generate a boosted output signal. The controller may be configured to provide the boosted output signal to the voltage tunable capacitor to adjust a bias voltage of the voltage tunable capacitor.

Abstract: A vibration device includes a base substrate made of silicon and having a first surface and a second surface facing away from the first surface, a lid bonded to the base substrate, a vibrator disposed at the first surface of the base substrate and accommodated in a space between the base substrate and the lid, and a thermistor element disposed at the base substrate.

Abstract: A vibration element includes: a quartz crystal substrate having a first vibration part and a second vibration part; a pair of first excitation electrodes formed at two main surfaces of the quartz crystal substrate, at the first vibration part; and a pair of second excitation electrodes formed in such a way as to sandwich the second vibration part in a direction of thickness of the quartz crystal substrate, at the second vibration part. At least one second excitation electrode of the pair of second excitation electrodes is formed at an inclined surface inclined to at least one of the two main surfaces.

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 resonator device having a sandwich structure is provided. A crystal oscillator includes: a crystal resonator plate; a first sealing member covering a first excitation electrode of the crystal resonator plate; and a second sealing member covering a second excitation electrode of the crystal resonator plate. A parallelepiped shaped package is formed by bonding: the first sealing member to the crystal resonator plate; and the second sealing member to the crystal resonator plate. The package includes an internal space in which is hermetically sealed a vibrating part of the crystal resonator plate including the first excitation electrode and the second excitation electrode. A bonding material hermetically sealing the vibrating part of the crystal resonator plate is formed to have an annular shape in plan view, and is disposed along an outer peripheral edge of the package.

Abstract: A microelectromechanical system (MEMS) sensor includes a substrate having a piezoelectric layer thereon; a MEMS piezoelectric resonator including a reference electrode on a first side of the piezoelectric layer, a first port (port 1) including a capacitor coupling electrode on a side of the piezoelectric layer opposite the first side, and a second port (port 2) for excitation signal coupling including another electrode on the side opposite the first side. The MEMS piezoelectric resonator has a natural resonant frequency. A variable capacitor on the substrate is positioned lateral to the MEMS piezoelectric resonator having a first and a second plate are connected to port 1. An antenna or an oscillator circuit is connected to port 2. Responsive to a physical parameter a capacitance of the variable capacitor changes which changes a frequency of the MEMS piezoelectric resonator relative to the natural resonant frequency to generate a frequency shift.

Abstract: A method for manufacturing a piezoelectric vibration element that includes preparing a piezoelectric substrate; providing a first electrode layer on a first main surface of the piezoelectric substrate; arranging a mask on a side of the first main surface of the piezoelectric substrate, the mask including a center region and a peripheral region located along a periphery of the center region; and irradiating a radiation beam through the mask toward the first main surface of the piezoelectric substrate such that a larger amount of the radiation beam passes through the peripheral region than the center region of the mask so as to remove a part of the first electrode layer to form a first excitation electrode that decreases in thickness from the center region to the peripheral region of the mask on the first main surface of the piezoelectric substrate.

Abstract: A piezoelectric resonator unit comprises a first enclosure portion that includes a first principal surface portion and a substantially curtain-shaped portion which cooperate to define a first recessed portion. The first principal surface portion has a first flat principal surface and the substantially curtain-shaped portion surrounds the first principal surface when viewed from a normal direction to the first principal surface. A second enclosure portion has a flat second principal surface and cooperates with the first recessed portion to define an enclosure which houses a piezoelectric resonator. A brazing material joins a distal end of the first enclosure portion to the second enclosure portion to hermetically seal the enclosure. An inner peripheral surface of the substantially curtain-shaped portion includes a stepped portion that is defined by adjacent thicker and a thinner portions of the substantially curtain-shaped portion. A surface of the stepped portion is formed of a single material.

Abstract: A vibration element includes: a base; an arm continuous with the base; a first electrode that includes a first layer of titanium nitride and a second layer containing nitrogen, titanium, and oxygen, and is disposed on the arm; an aluminum nitride layer in contact with the second layer; and a second electrode disposed on the aluminum nitride layer.

Abstract: A clock signal is generated with an oscillator. A crystal oscillator core within the oscillator circuit is switched on to produce first and second oscillation signals that are approximately opposite in phase. When a difference between a voltage of the first oscillation signal and a voltage of the second oscillation signal exceeds an upper threshold range, the crystal oscillator core is switched off. When the difference between the voltage of the first oscillation signal and the voltage of the second oscillation signal falls below the upper threshold range, the crystal oscillator core is switched back on. This operation is repeated so as to produce the clock signal.

Abstract: An oscillator circuit comprises a crystal oscillator arranged to generate an oscillation signal, a bias current generator arranged to supply a bias current to the crystal oscillator, and a feedback stage arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator is arranged to: in response to a supply of power to the oscillator circuit being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator, supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.

Abstract: An oscillator circuit includes a circuit for oscillation that oscillates a resonator and outputs an oscillation signal, a temperature sensing element that outputs a temperature detection signal, an analog/digital conversion circuit that converts the temperature detection signal into a temperature code which is a digital signal and converts a power supply voltage into a power supply voltage code which is a digital signal, and a digital signal processing circuit that generates a correction code based on the power supply voltage code, and generates a temperature compensation code for compensating frequency-temperature characteristics of the oscillation signal based on the temperature code and the correction code.

Abstract: Briefly, embodiments of claimed subject matter relate to circuits and methods for providing signals, such as signals to bring about writing of binary logic values to magnetic random-access memory (MRAM) cells. In particular embodiments, such circuits may operate to control output signal variability over an operating temperature range.

Abstract: Embodiments of the present invention provide a data transmitter for transmitting a radio signal, the data transmitter being configured to modify a standard-based radio signal in order to transmit a modified radio signal, the amplitude of which, in a frequency band, additionally has a bit sequence.

Abstract: A circuit apparatus includes an oscillation circuit that causes a resonator to oscillate to produce an oscillation signal, an oven control circuit that controls a heater provided in correspondence with the resonator, a non-volatile memory that stores control data, a holding circuit that holds the control data transferred from the non-volatile memory, and a processing circuit that carries out a process based on the control data held in the holding circuit. After a power source voltage is supplied, the processing circuit carries out the process of transferring the control data from the non-volatile memory to the holding circuit, and after the transfer of the control data is completed, the processing circuit causes based on a data transfer end signal the oven control circuit to start operating.

Abstract: A circuit device includes an oscillation circuit and a processing circuit. The oscillation circuit includes a variable capacitance circuit configured by a capacitor array and oscillates at an oscillation frequency corresponding to the capacitance value of the variable capacitance circuit. First temperature data and second temperature data subsequent to the first temperature data are input to the processing circuit as temperature data. In the period between the start of the capacitance control based on the first temperature data and the start of the capacitance control based on the second temperature data, the processing circuit switches the first capacitance control data corresponding to the first temperature data and the second capacitance control data different from the first capacitance control data in a time-division manner to be output to the variable capacitance circuit.

Abstract: A vibration device includes: a first substrate including a first surface and a second surface located at an opposite side of the first surface, and a first integrated circuit disposed on at least one of the first surface and the second surface; a second substrate including a third surface bonded to the second surface, a fourth surface located at an opposite side of the third surface, a recess that opens to the third surface, and a second integrated circuit disposed on the fourth surface; and a vibration element accommodated in a space defined by an opening of the recess being closed by the first substrate.

Abstract: In one embodiment, a device in a low-power and lossy network (LLN) makes, based on a temperature measurement, a first adjustment to a frequency for a wireless channel used by the device to communicate with one or more neighboring devices in the LLN. The device receives, via the wireless channel, a packet from one of the neighboring devices that indicates a transmit frequency for the packet. The device calculates a frequency offset based on a difference between the transmit frequency for the packet and the adjusted frequency for the wireless channel. The device makes, based on the calculated frequency offset, a second adjustment to the frequency for the wireless channel used by the device to communicate with the one or more neighboring devices in the LLN.

Abstract: An integrated circuit device includes first and second temperature sensors, an A/D conversion circuit that performs A/D conversion on first and second temperature detection voltages from the first and second temperature sensors and outputs first and second temperature detection data, a connection terminal that is electrically connected to a temperature detection target device of the first and second temperature sensors, and a digital signal processing circuit that performs digital calculation based on the first and second temperature detection data and performs a temperature compensation process of correcting temperature characteristics of the temperature detection target device.

Abstract: A circuit includes an oscillator having a driver and a resonator. The driver receives a supply voltage at a supply input and provides a drive output to drive the resonator to generate an oscillator output signal. A power converter receives an input voltage and generates the supply voltage to the supply input of the driver. A temperature tracking device in the power converter controls the voltage level of the supply voltage to the supply input of the driver based on temperature such that the supply voltage varies inversely to the temperature of the circuit.

Abstract: Embodiments of circuits and methods for starting a crystal oscillator are disclosed herein. In one example, an oscillation circuit is disclosed. The oscillation circuit includes a multi-phase oscillator, a control circuit, a phase selection circuit, a drive circuit, and a crystal oscillator. The multi-phase oscillator is configured to generate candidate clock signals of multiple phases. The phase selection circuit is coupled to the multi-phase oscillator and configured to select a clock signal from the candidate clock signals. The drive circuit is coupled to the phase selection circuit and configured to inject the selected clock signal to the crystal oscillator for a period of time determined by the control circuit. The control circuit is coupled to the phase selection circuit and the drive circuit and is configured to control the on and off of the drive circuit and output a plurality of injections signals.

Abstract: An oscillator includes a resonator, a temperature control element that controls a temperature of the resonator, a first temperature sensing element that outputs a first temperature detection signal, a second temperature sensing element that is provided at a position farther from the resonator than the first temperature sensing element and outputs a second temperature detection signal, an analog/digital conversion circuit that converts the first temperature detection signal into a first temperature code which is a digital signal, and converts the second temperature detection signal into a second temperature code which is a digital signal, and a digital signal processing circuit that generates a temperature control code for controlling the temperature control element based on the first temperature code and the second temperature code.

Abstract: A circuit device includes an oscillation circuit that generates an oscillation signal by using an oscillator, a processing unit that controls the oscillation circuit, and an interface unit that outputs authentication information to an external device. The authentication information being information based on specific information of the circuit device and is used to authenticate the circuit device.

Abstract: Method, systems, and circuitries are provided for generating an output signal with reduced spurs by dithering. A method to generate an output signal having a desired frequency based on a reference signal having a reference frequency includes receiving a desired phase shift between a next cycle of the output signal with respect to a next cycle of the reference signal. A mapping between respective code words and phase shifts is read. A first codeword mapped to a first phase shift that is lower in value to the desired phase shift is identified. A second codeword mapped to a second phase shift that is higher in value to the desired phase shift is identified. The method includes selecting either the first codeword or the second codeword and generating the output signal based on the selected codeword.

Abstract: An electronic circuit board includes a substrate having a multilayer structure including a ground layer, has at least one configuration in which, in a ground layer closest to a signal terminal of an oscillator, a region overlapping a signal terminal in a plan view is a non-forming region of a ground electrode, in a ground layer closest to a first wiring connecting the signal terminal of the oscillator and an input portion of an amplifier, a region overlapping the first wiring in the plan view is a non-forming region of a ground electrode, and in a ground layer closest to a second wiring connecting the signal terminal of the oscillator and an output portion of the amplifier, a region overlapping the second wiring in the plan view is a non-forming region of a ground electrode.

Abstract: The present document relates to oscillator circuits and a method. An oscillator circuit generates an oscillating voltage signal, wherein the crystal has a first electrode and a second electrode. The oscillator circuit has a power source with a supply terminal and a reference terminal. The oscillator circuit has a switching circuit arranged between the power source and the crystal. The switching circuit, in a start-up phase, alternately connects the supply terminal of the power source to the first and second electrode of the crystal such that an amplitude of the oscillating voltage signal is increased.

Abstract: A quartz crystal resonator is coupled to an electronic circuit. A capacitive or resistive element is provided for adjusting a frequency of the quartz crystal resonator on activation or deactivation of a function of a circuit. Control is made according to a model of an expected variation of a temperature of the quartz crystal resonator.

Abstract: A quartz crystal resonator is connected to an array of switchable capacitors or resistors. The switched actuation of elements of the array is controlled by bits of a control word. At least one of the bits of the control word is controlled by pulse width modulation to effectuate a tuning of the oscillation frequency of the quartz crystal resonator.

Abstract: Components associated with receiving user touch input, receiving user force input, and providing haptic output interface are integrated into a unified input/output interface that includes a transducer substrate formed with a monolithic or multi-layer body having a number of electrodes disposed on surfaces thereof. Electrodes are selected by a controller to provide touch input sensing, force input sensing, and haptic output.

Abstract: A sensing sensor includes an oscillator circuit, a base, a connection portion, and a temperature changing unit. The oscillator circuit oscillates the piezoelectric resonator. The base includes a base main body in which a depressed portion is provided and a lid portion at one side, supports the piezoelectric resonator at another side, and is for taking the oscillation frequency to an outside of the sensing sensor. The depressed portion houses the oscillator circuit. The lid portion covers the depressed portion. The connection portion is disposed at the one side of the base and connected to a cooling mechanism for cooling the base from the one side. The temperature changing unit is interposed between the piezoelectric resonator and the base, so as to cool and heat the piezoelectric resonator and transfer a heat radiated for cooling the piezoelectric resonator from the other side of the base to the one side.

Abstract: A crystal oscillator circuit (100, 200) is described that includes a crystal resonator (220); and a voltage source (204) configured to apply a voltage step across the crystal oscillator (220) where a polarity of the voltage source (204) applied to the crystal resonator (220) is switched in response to a sign of a current passing through the crystal resonator (220) and in response thereto a self-timed energy injection waveform is provided to the crystal resonator (220).

Abstract: A crystal oscillator includes an inverter configured to receive a first voltage at a first node and output a second voltage at a second node, a stacked-diode feedback network inserted between the first node and the second node, a waveform shaper configured to couple the second node to a third node in accordance with the first voltage, a crystal inserted between a fourth node and a fifth node, wherein the fourth node is coupled to the third node, and the fifth node is coupled to the first node, a first shunt capacitor inserted between the fourth node and a ground node, and a second shunt capacitor inserted between the fifth node to and the ground node.

Abstract: A method and system for generating a crystal model for a test product including a crystal oscillator are herein disclosed. The method includes measuring a first temperature of the test product and measuring a first frequency error of the crystal oscillator at a first calibration point during a product testing process, measuring a second temperature of the test product and measuring a second frequency error of the crystal oscillator at a second calibration point during the product testing process, estimating two parameters from the first temperature, first frequency error, second temperature, and second frequency error, and determining a 3rd order polynomial for the crystal model based on the two parameters.

Abstract: An oscillator includes a first container, a second container accommodated in the first container, a resonator element accommodated in the second container, a temperature sensor accommodated in the second container, a first circuit element that is accommodated in the second container and includes an oscillation circuit that causes the resonator element to oscillate so as to generate an oscillation signal on which temperature compensation is performed based on a detected temperature of the temperature sensor, and a second circuit element that is accommodated in the first container and includes a frequency control circuit that controls a frequency of the oscillation signal. The second container and the second circuit element are stacked.

Abstract: An oscillator includes a first container that includes a first base substrate and a first lid bonded to the first base substrate and has a first internal space, a second container that is accommodated in the first internal space and fixed to the first base substrate, a resonator element that is accommodated in the second container, a temperature sensor that is accommodated in the second container, a first circuit element that is accommodated in the second container and includes an oscillation circuit oscillating the resonator element and generating an oscillation signal on which temperature compensation is performed based on a detected temperature of the temperature sensor, and a second circuit element that is fixed to the first base substrate and includes a frequency control circuit that controls a frequency of the oscillation signal, in which the second container and the second circuit element are arranged side by side in plan view.

Abstract: An oscillator includes a first container that includes a first base substrate and a first lid and that has a first internal space, a second container that is fixed to the first base substrate in the first internal space and that includes a second base substrate and a second lid and that has a second internal space, a resonator element that is disposed on the lower surface side of the second base substrate in the second internal space, a temperature sensor that is disposed on the upper surface side of the second base substrate, a first circuit element that includes an oscillation circuit and a second circuit element that is fixed to the first base substrate in the first internal space and that includes a frequency control circuit that controls a frequency of the oscillation signal output by the oscillation circuit. The second container and the second circuit element are arranged side by side in plan view.

Abstract: Systems and methods are provided for compensating for mechanical acceleration at a reference oscillator. A reference oscillator provides an oscillator output signal and an accelerometer on a same platform as the reference oscillator, such that mechanical acceleration at the reference oscillator is detected at the accelerometer to produce a measured acceleration. A filter assembly, having an associated set of filter weights, receives the measured acceleration from the accelerometer and provides a tuning control signal responsive to the measured acceleration to a frequency reference associated with the system. An adaptive weighting component receives the oscillator output signal of the reference oscillator and an external signal that is provided from a source external to the platform and adjusts the set of filter weights for the filter assembly based on a comparison of the external signal and the oscillator output signal.