With Temperature Modifier Patents (Class 331/70)
  • Patent number: 9692356
    Abstract: The systems and methods of oscillator frequency tuning using a bulk acoustic wave resonator include a relaxation oscillator, a BAW oscillator, a frequency counter, and an adjustment module. The BAW oscillator provides an accurate time reference even over temperature changes. The BAW oscillator is turned on periodically and the relaxation oscillator is calibrated with the BAW oscillator. A temporary and periodic enablement of the BAW oscillator maintains a low current consumption. The frequency counter counts a number of full periods of the BAW oscillator that occur in one period of the relaxation oscillator. Since each frequency is known, the number of pulses of the BAW oscillator that should occur during one period of the relaxation oscillator is known. If the count is different from what should be counted, a correction may be made by adjusting an input parameter of the relaxation oscillator.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: June 27, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Baher S. Haroun, Ali Kiaei, Kai Yiu Tam
  • Patent number: 9515664
    Abstract: An oscillator includes an oscillation element, an oscillation circuit, a heat generation element, a temperature control circuit, and a temperature correction signal generation circuit adapted to generate a temperature correction signal used to correct a frequency-temperature characteristic. The temperature correction signal generation circuit includes a temperature sensor, a first-order correction signal generation circuit adapted to generate a first-order correction signal, and a high-order correction signal generation circuit adapted to generate a high-order correction signal.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: December 6, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Takemi Yonezawa, Tomohiro Uno
  • Patent number: 9467091
    Abstract: An electronic device includes a resonator provided with a heating element, and a circuit component opposed to the heating element, and provided with at least an oscillating amplifier element, and a distance between the heating element and the circuit component is in a range not smaller than 0 mm and no larger than 1.5 mm.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: October 11, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Kensaku Isohata
  • Patent number: 9287881
    Abstract: An electronic device includes a heat generator having a terminal, a resonator which has an outer connection terminal and on which the heat generator is disposed, a first substrate having a first surface and a second surface with the resonator connected to the first surface, and a circuit part and other electronic parts disposed on the first surface or the second surface. The outer connection terminal of the resonator is connected to the first surface, and the terminal of the heat generator is connected to the second surface.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: March 15, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Kazuhiko Shimodaira, Kyo Horie
  • Patent number: 9178469
    Abstract: A quartz crystal oscillator as a resonation device includes a substrate, a quartz crystal resonator as a resonator attached with a heating element, terminals adapted to fix the resonator and the substrate to each other, and intermediate members having an electrical insulation property and lower in thermal conductivity than the terminals. The intermediate members intervene between the resonator and the substrate via the terminals, and a gap is disposed between the quartz crystal resonator and the substrate.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: November 3, 2015
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Manabu Kondo
  • Patent number: 9148132
    Abstract: A method of providing an oscillating signal, comprising providing a first constant current flowing from a positive power supply node, the first constant current independent of a variation in a positive power supply node voltage, providing a second constant current flowing from a positive power supply node to a second electrode of a capacitor, a first electrode of the capacitor connected directly to the positive power supply node, the second constant current mirroring the first constant current and charging the capacitor by reducing a voltage across the capacitor. A third constant current is provided flowing from the positive power supply node through a first NMOS transistor and mirroring the first constant current, the first NMOS transistor having a gate connected directly to the second electrode of the capacitor and an oscillating signal generated by turning on the first NMOS transistor when the capacitor reaches a predetermined voltage level.
    Type: Grant
    Filed: August 15, 2013
    Date of Patent: September 29, 2015
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventor: Yi-Tzu Chen
  • Patent number: 9100023
    Abstract: A crystal oscillator includes: an oscillation circuit; first and second oscillation circuits connected to first and second temperature detection crystal units, respectively; a heating portion configured to constantly maintain an ambient temperature; a frequency difference detection portion that obtains, as a temperature detection value, “{(f2?f1)/f1}?{(f2r?f1r)/f1r}”, where “f1” and “f2” denote oscillation frequencies of the first and second oscillation circuits, respectively, and “f1r” and “f2r” denote oscillation frequencies of the first and second oscillation circuits, respectively, at a reference temperature; an accumulator that accumulates the temperature detection value; a rounding processing portion that performs rounding for the temperature detection value accumulated in the accumulator depending on a rounding factor designated independently from the accumulation number; and a heating control portion that controls power supplied to the heating portion based on the temperature detection value subjected
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: August 4, 2015
    Assignee: NIHON DEMPA KOGYO CO., LTD.
    Inventors: Kazuo Akaike, Kaoru Kobayashi
  • Patent number: 9046556
    Abstract: Apparatus, systems, and methods are provided for sensing devices. An exemplary sensing device includes a sensing arrangement on a substrate to sense a first property, a heating arrangement, and a control system coupled to the first sensing arrangement and the heating arrangement to activate the heating arrangement to heat the first sensing arrangement and deactivate the heating arrangement while obtaining one or more measurement values for the first property from the first sensing arrangement.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: June 2, 2015
    Assignee: FREESCALE SEMICONDUCTOR INC.
    Inventors: Kevin R. Fugate, Edward W. Carstens, Paige M. Holm, Dean W. Miller
  • Patent number: 9019022
    Abstract: The present invention discloses an Oven Controlled Crystal Oscillator and a manufacturing method thereof. The Oven Controlled Crystal Oscillator comprises a thermostatic bath, a heating device, a PCB and a signal generating element, where the signal generating element is used for generating a signal of a certain frequency, the heating device, the PCB and the signal generating element are mounted in the thermostatic bath, the signal generating element is mounted in a groove formed on one side of the PCB, while the heating device is mounted against the other side of the PCB that is opposite to the groove. The signal generating element may be a passive crystal resonator or an active crystal oscillator. The Oven Controlled Crystal Oscillator according to the invention is advantageous for a small volume and a high temperature control precision.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: April 28, 2015
    Assignee: Guangdong Dapu Telecom Technology Co., Ltd.
    Inventor: Chaosheng Liu
  • Patent number: 9019023
    Abstract: An oscillator outputs a control signal to suppress an influence caused by temperature characteristic of f1 based on a differential signal corresponding to difference between an oscillation output f1 of a first oscillator circuit and an oscillation output f2 of a second oscillator circuit treated as a temperature detection value. A switching unit switches between a first state and a second state. The first state is a state where a first connecting end and a second connecting end are connected to a storage unit for access from an external computer to the storage unit. The second state is a state where the first connecting end and the second connecting end are connected to a first signal path and a second signal path such that the respective f1 and f2 are retrieved from the first connecting end and the second connecting end to an external frequency measuring unit.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: April 28, 2015
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventor: Tomoya Yorita
  • Patent number: 9007119
    Abstract: A method of operating a system including a MEMS device of an integrated circuit die includes generating an indicator of a device parameter of the MEMS device in a first mode of operating the system using a monitor structure formed using a MEMS structural layer of the integrated circuit die. The method includes generating, using a CMOS device of the integrated circuit die, a signal indicative of the device parameter and based on the indicator. The device parameter may be a geometric dimension of the MEMS device. The method may include, in a second mode of operating the system, compensating for a difference between a value of the signal and a target value of the signal. The method may include re-generating the indicator after exposing the MEMS device to stress and generating a second signal indicating a change in the device parameter.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: April 14, 2015
    Assignee: Silicon Laboratories Inc.
    Inventors: Aaron J. Caffee, Brian G. Drost, Emmanuel P. Quevy
  • Patent number: 9000856
    Abstract: A method and device for calibrating an oscillator and a temperature sensor in an electronic device are provided. A same temperature cycle, which includes at least two distinct temperatures, may be used to obtain data to calibrate both the oscillator and the temperature sensor. One of the distinct temperatures may comprise an ambient temperature, and a second distinct temperature may comprise a heated temperature greater than the ambient temperature. The electronic device (or a calibration device separate from the electronic device) may receive the readings from the oscillator and the temperature sensor at the two distinct temperatures in the same temperature cycle, and may determine an oscillator correction factor and a temperature sensor correction factor.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: April 7, 2015
    Assignee: SanDisk Technologies Inc.
    Inventors: Deepak Pancholi, Bhavin Odedara
  • Patent number: 8994428
    Abstract: A period signal generation circuit including a control voltage generator and a period controller. The control voltage generator selecting one of temperature-dependent voltages to output the selected temperature-dependent voltage as a control voltage. The first and second temperature-dependent voltages varying according to a temperature and the third temperature-dependent voltage is constant regardless of variation of the temperature. The period controller configured to determine an amount of a current discharging from an internal node in response to the control voltage and outputs a periodic signal whose cycle time is determined according to a level of an internal signal induced at the internal node.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: March 31, 2015
    Assignee: SK Hynix Inc.
    Inventor: Hyun Ju Ham
  • Publication number: 20150084705
    Abstract: A temperature control circuit of an oven controlled crystal oscillator is a circuit in which a supply voltage is applied to a first terminal of a resistance R10, a first terminal of a resistance R11, and a first terminal of a heater resistance RH1, a second terminal of a thermistor TH1, a second terminal of a temperature sensing element, and a collector side of a transistor Q2 are connected to a common ground, a first terminal of a temperature sensing element ZZ is connected to an input terminal of an operational amplifier IC2, and a setting temperature in a thermostatic oven is controlled to gradually rise as an ambient operative temperature rises.
    Type: Application
    Filed: August 15, 2014
    Publication date: March 26, 2015
    Inventor: JUNICHI ARAI
  • Publication number: 20150084706
    Abstract: An oscillator according to the disclosure includes a crystal unit, an IC chip, an adhesive agent flow prevention film, and a lead frame. The lead frame is disposed in a peripheral area of the pair of crystal terminals and the IC chip in an approximately same surface as the one surface of the flat container of the crystal unit. The lead frame includes a wiring part that is connected to an IC terminal of the IC chip by a bonding wire and is buried in the resin mold, and a mounting terminal forming portion that extends from the wiring part and is folded along an outside of the resin mold in a back surface that is another surface side opposite to the one surface of the crystal unit so as to form a mounting terminal.
    Type: Application
    Filed: August 29, 2014
    Publication date: March 26, 2015
    Inventor: FUMIO ASAMURA
  • Patent number: 8988159
    Abstract: There is provided an oscillator capable of lowering the power supply voltage without degrading the phase noise, while employing the conventional circuit configuration. According to one aspect of the present invention, there is provided an oscillator comprising: an oscillation circuit; a bias generation circuit for generating a bias signal to drive the oscillation circuit; and a booster circuit for boosting a power supply voltage to generate a boosted voltage for driving the bias generation circuit. In addition, the oscillation circuit, the bias generation circuit, and the booster circuit are provided in a single IC chip, and the booster circuit may receive the power supply voltage VDD from the power supply arranged at the exterior of the IC chip.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: March 24, 2015
    Assignee: Asahi Kasei Microdevices Corporation
    Inventor: Haruhiko Maru
  • Publication number: 20150061783
    Abstract: A crystal controlled oscillator includes a crystal unit, an oscillator circuit, a temperature detector for crystal unit, a heating unit for crystal unit, a temperature detector for oscillator circuit, and a heating unit for oscillator circuit. The heating unit for crystal unit is configured to control an output of the crystal unit based on a temperature detected by the temperature detector for crystal unit to compensate the temperature of the atmosphere where the crystal unit is placed to be constant. An output of the heating unit for oscillator circuit is controlled independently from the heating unit for crystal unit based on a temperature detected by the temperature detector for oscillator circuit to compensate the temperature of the atmosphere where the oscillator circuit is placed to be constant.
    Type: Application
    Filed: August 25, 2014
    Publication date: March 5, 2015
    Inventor: TOMOYA YORITA
  • Publication number: 20150054590
    Abstract: An oven controlled crystal oscillator (OCXO) is provided for improving temperature characteristics of a frequency. In the OCXO, a thermostatic oven 5 (20a) is provided in a thermostatic oven 9 (20b), a temperature control circuit 13 controls a temperature in the thermostatic oven 9 based on a temperature detected by a temperature sensing element 10, a first resonator 1 and a second resonator 2 are provided in the thermostatic oven 5, a temperature control circuit 8 controls the temperature based on an oscillation frequency difference between the two resonators, and especially, the temperature control circuit 13 controls the temperature to be within the temperature region where the oscillation frequency difference between the first resonator 1 and the second resonator 2 corresponds with the resonator temperature in a one-to-one manner, and the temperature gradient is either in a positive direction or in a negative direction.
    Type: Application
    Filed: June 18, 2014
    Publication date: February 26, 2015
    Inventor: FUMIO URABE
  • Publication number: 20140368283
    Abstract: An electronic device includes a heat generator having a terminal, a resonator which has an outer connection terminal and on which the heat generator is disposed, a first substrate having a first surface and a second surface with the resonator connected to the first surface, and a circuit part and other electronic parts disposed on the first surface or the second surface. The outer connection terminal of the resonator is connected to the first surface, and the terminal of the heat generator is connected to the second surface.
    Type: Application
    Filed: June 12, 2014
    Publication date: December 18, 2014
    Inventors: Kazuhiko SHIMODAIRA, Kyo HORIE
  • Publication number: 20140361843
    Abstract: A technique decouples a MEMS device from sources of strain by forming a MEMS structure with suspended electrodes that are mechanically anchored in a manner that reduces or eliminates transfer of strain from the substrate into the structure, or transfers strain to electrodes and body so that a transducer is strain-tolerant. The technique includes using an electrically insulating material embedded in a conductive structural material for mechanical coupling and electrical isolation.
    Type: Application
    Filed: July 12, 2013
    Publication date: December 11, 2014
    Inventors: Emmanuel P. Quevy, Daniel N. Koury, Jr.
  • Publication number: 20140361844
    Abstract: A technique decouples a MEMS device from sources of strain by forming a MEMS structure with suspended electrodes that are mechanically anchored in a manner that reduces or eliminates transfer of strain from the substrate into the structure, or transfers strain to electrodes and body so that a transducer is strain-tolerant. The technique includes using an electrically insulating material embedded in a conductive structural material for mechanical coupling and electrical isolation. An apparatus includes a MEMS device including a first electrode and a second electrode, and a body suspended from a substrate of the MEMS device. The body and the first electrode form a first electrostatic transducer. The body and the second electrode form a second electrostatic transducer. The apparatus includes a suspended passive element mechanically coupled to the body and electrically isolated from the body.
    Type: Application
    Filed: September 18, 2013
    Publication date: December 11, 2014
    Applicant: Silicon Laboratories Inc.
    Inventors: Emmanuel P. Quevy, Daniel N. Koury, JR.
  • Publication number: 20140354365
    Abstract: A device for compensating temperature drift of a voltage controlled oscillator (VCO) is provided. The VCO has at least one varactor arranged for controlling an output frequency fOut of said VCO by applying a tuning voltage VTune and simultaneously applying a bias voltage VBias on a cathode and an anode of said at least one varactor, respectively. Said device comprises a monitoring circuit and a tuning circuit. Said monitoring circuit has an input arranged to receive said VTune and is arranged to monitor said VTune and further is arranged to activate said tuning circuit based on a value of said VTune, and said tuning circuit has an output connected to said anode and is arranged to output said VBias, wherein said tuning circuit further is arranged to tune said VCO by changing said VBias so as to compensate for a temperature drift of said VCO.
    Type: Application
    Filed: August 18, 2014
    Publication date: December 4, 2014
    Inventors: Peng Gao, Yongquan Chen, Bingxin Li, Christian Grewing
  • Publication number: 20140347139
    Abstract: The invention relates to a frequency generator assembly, including at least one oscillator and an electronic signal processing device, which is designed in such a way that the electronic signal processing device provides an electric clock signal (f) having a defined frequency as an output signal of the frequency generator assembly, wherein the defined frequency depends on the vibration frequency of the oscillator, wherein the oscillator includes at least one micromechanical seismic mass which is vibrationally excited by at least one driving device, whereupon the electronic signal processing device generates and provides the electric clock signal (f) according to the vibration frequency of the at least one seismic mass.
    Type: Application
    Filed: December 10, 2012
    Publication date: November 27, 2014
    Applicant: Continental Teves AG & Co. OHG
    Inventors: Jörg Heimel, Timo Dietz, Gerhard Möheken, Stefan Günthner
  • Publication number: 20140347138
    Abstract: A low phase noise dual mode resonator and a method of making and using said resonator is disclosed. The dual mode resonator is capable of sustaining two frequency vibration modes simultaneously. The two frequency vibration modes are capable of exhibit non-linear coupling when one is driven at a higher voltage than the other. The dual mode resonator is configured such that the ratio of the two vibration frequency modes is a value that maximizes the non-linear coupling effect. As a result of the non-linear effect, the phase noise on the mode that is not overdriven is reduced.
    Type: Application
    Filed: May 21, 2014
    Publication date: November 27, 2014
    Applicant: RUTGERS, THE STATE UNIVERSITY OF NEW JERSEY
    Inventors: Yook-Kong Yong, John R. Vig
  • Publication number: 20140320220
    Abstract: The present invention discloses an Oven Controlled Crystal Oscillator and a manufacturing method thereof. The Oven Controlled Crystal Oscillator comprises a thermostatic bath, a heating device, a PCB and a signal generating element, where the signal generating element is used for generating a signal of a certain frequency, the heating device, the PCB and the signal generating element are mounted in the thermostatic bath, the signal generating element is mounted in a groove formed on one side of the PCB, while the heating device is mounted against the other side of the PCB that is opposite to the groove. The signal generating element may be a passive crystal resonator or an active crystal oscillator. The Oven Controlled Crystal Oscillator according to the invention is advantageous for a small volume and a high temperature control precision.
    Type: Application
    Filed: November 20, 2012
    Publication date: October 30, 2014
    Inventor: Chaosheng Liu
  • Publication number: 20140320221
    Abstract: An electronic device includes: a substrate; a resonation device; a heating element; a first support which is mounted on the substrate and supports the resonation device; and a second support which supports the substrate, in which the relationship between thermal conductivity ?1 of the first support and thermal conductivity ?2 of the second support satisfies an expression, ?1>?2.
    Type: Application
    Filed: April 21, 2014
    Publication date: October 30, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Manabu KONDO
  • Publication number: 20140320222
    Abstract: An electronic device includes a resonator provided with a heating element, and a circuit component opposed to the heating element, and provided with at least an oscillating amplifier element, and a distance between the heating element and the circuit component is in a range not smaller than 0 mm and no larger than 1.5 mm.
    Type: Application
    Filed: April 21, 2014
    Publication date: October 30, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Kensaku ISOHATA
  • Publication number: 20140292422
    Abstract: A quartz crystal oscillator as a resonation device includes a substrate, a quartz crystal resonator as a resonator attached with a heating element, terminals adapted to fix the resonator and the substrate to each other, and intermediate members having an electrical insulation property and lower in thermal conductivity than the terminals. The intermediate members intervene between the resonator and the substrate via the terminals, and a gap is disposed between the quartz crystal resonator and the substrate.
    Type: Application
    Filed: March 20, 2014
    Publication date: October 2, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Manabu KONDO
  • Publication number: 20140292421
    Abstract: An electronic device includes: a support member including a first terminal, a second terminal, and a support portion extending from the first terminal and coupling the first terminal with the second terminal; an electronic component; and a bonding member connecting the first terminal with the electronic component. In a plan view along a direction in which the first terminal and the electronic component overlap each other, a portion of the first terminal is adjacent to the support portion with a notch portion therebetween and protrudes toward the extending direction side of the support portion. The support portion is bent at a portion adjacent to the protruding portion of the first terminal along the overlapping direction.
    Type: Application
    Filed: March 20, 2014
    Publication date: October 2, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Manabu KONDO
  • Publication number: 20140292423
    Abstract: An oscillator includes an oscillation element; an oscillation circuit which causes the oscillation element to oscillate; a heat generation element which heats the oscillation element; a temperature control circuit which controls the heat generation element; and a temperature correction circuit which corrects frequency-temperature characteristics of an output signal of the oscillation circuit.
    Type: Application
    Filed: March 20, 2014
    Publication date: October 2, 2014
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Kensaku ISOHATA, Atsushi KIYOHARA
  • Publication number: 20140292424
    Abstract: A crystal oscillator includes: an oscillation circuit; first and second oscillation circuits connected to first and second temperature detection crystal units, respectively; a heating portion configured to constantly maintain an ambient temperature; a frequency difference detection portion that obtains, as a temperature detection value, “{(f2?f1)/f1}?{(f2r?f1r)/f1r}”, where “f1” and “f2” denote oscillation frequencies of the first and second oscillation circuits, respectively, and “f1r” and “f2r” denote oscillation frequencies of the first and second oscillation circuits, respectively, at a reference temperature; an accumulator that accumulates the temperature detection value; a rounding processing portion that performs rounding for the temperature detection value accumulated in the accumulator depending on a rounding factor designated independently from the accumulation number; and a heating control portion that controls power supplied to the heating portion based on the temperature detection value subjected
    Type: Application
    Filed: March 27, 2014
    Publication date: October 2, 2014
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: KAZUO AKAIKE, KAORU KOBAYASHI
  • Publication number: 20140159823
    Abstract: Systems, methods, and assemblies to provide clock signals to electrical components of downhole tools are provided. In one example, an oscillator assembly may include a silicon-based oscillator having a variable capacitor circuit. The silicon-based oscillator may provide an output signal at a frequency within a range of frequencies. The oscillator assembly may also include control circuitry electrically coupled to the silicon-based oscillator. Moreover, the control circuitry may include a temperature input that receives a temperature corresponding to the silicon-based oscillator. The control circuitry may also include a control signal output electrically coupled to the silicon-based oscillator. The control signal output may be used to change a capacitance of the variable capacitor circuit based on the temperature received by the temperature input to maintain the output signal of the silicon-based oscillator within the range of frequencies.
    Type: Application
    Filed: December 5, 2013
    Publication date: June 12, 2014
    Applicant: Schlumberger Technology Corporation
    Inventors: Toshihiro Nomura, Patrick P. Vessereau, Nigel Greer
  • Patent number: 8749314
    Abstract: A crystal unit and a thermistor with negative resistance-temperature characteristics are housed in a thermostatic oven heated by a heater. A transistor driving the heater is controlled by an output of a differential amplifier, the thermistor is placed between a power supply voltage and an inverting input of the amplifier, and a first resistor used to adjust the temperature of a zero temperature coefficient point of the crystal unit is installed between the inverting input and a ground point. A second resistor is installed between the power supply voltage and a non-inverting input of the amplifier and a third resistor is installed between the non-inverting input and ground point. One of the second and third resistors is a resistor assembly made up of a plurality of resistance elements and one of these resistance elements is provided with positive resistance-temperature characteristics and adapted to detect ambient temperature.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: June 10, 2014
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventors: Manabu Ito, Hiroyuki Mitome
  • Patent number: 8729973
    Abstract: A MEMS resonator comprises a resonator body (34), and an anchor (32) which provides a fixed connection between the resonator body (34) and a support body. A resistive heating element (R1,R2) and a feedback control system are used to maintain the resonator body (34) at a constant temperature. A location for thermally coupling the anchor (32) to the resistive heating element (R1,R2) is selected which has a lowest dependency of its temperature on the ambient temperature during the operation of the feedback control.
    Type: Grant
    Filed: September 7, 2009
    Date of Patent: May 20, 2014
    Assignee: NXP, B.V.
    Inventors: Jozef Thomas Martinus van Beek, Ronald Vogels
  • Patent number: 8717109
    Abstract: A temperature invariant digitally controlled oscillator is disclosed. The digitally controlled oscillator is configured to generate an output clock with stable frequency. The temperature invariant digitally controlled oscillator comprises a digitally controlled oscillator, a temperature sensor, a temperature decision logic circuit, and a temperature conditioner. The digitally controlled signal is provided to adjust the oscillation frequency of the digitally controlled oscillator by changing its capacitances. The stabilization of the silicon temperature is achieved with the temperature sensor, the temperature decision logic circuit, and the temperature conditioner.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: May 6, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventor: Hong-Yean Hsieh
  • Patent number: 8710938
    Abstract: An electronic device may include a voltage controlled oscillator (VCO) and a temperature sensor. The electronic device may also include a controller configured to cooperate with the VCO and the temperature sensor to determine both a temperature and a frequency error of the VCO for each of a plurality of most recent samples. Each of the most recent samples may have a given age associated therewith. The controller may also be configured to align the temperature, the frequency error, and the given age for each of most recent samples in a three-dimensional (3D) coordinate system having respective temperature, frequency error and age axes. The controller may also be configured to estimate a predicted frequency error of the VCO based upon the aligned temperature, frequency error, and given age of the most recent samples.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: April 29, 2014
    Assignee: BlackBerry Limited
    Inventors: Grant Henry Robert Bartnik, Ryan Jeffrey Hickey
  • Publication number: 20140091867
    Abstract: An oscillator IC includes a VDD terminal (first terminal), an OUT terminal (second terminal), an oscillation circuit for oscillating a resonator element, a mode switching circuit that switches between a normal mode (the first mode in which an oscillation signal output by the oscillation circuit is output from the OUT terminal) and a serial I/F mode (the second mode in which a signal than the oscillation signal is output or input from the OUT terminal) based on a voltage of the VDD terminal, and a control circuit that controls stop of the oscillation circuit in the serial I/F mode based on setting information that can be changed from outside.
    Type: Application
    Filed: September 24, 2013
    Publication date: April 3, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Mihiro Nonoyama
  • Publication number: 20140085015
    Abstract: An oscillation device is provided. The oscillation device includes: a main circuit portion, a heating unit, first and second crystal units, first and second oscillator circuits, a frequency difference detector, a first addition unit, an integration circuit unit, a circuit unit configured to control an electric power to be supplied to the heating unit, a compensation value obtaining unit, and a second addition unit. The compensation value obtaining unit is configured to obtain a frequency compensation value for compensating an output frequency of the main circuit portion based on an integrated value output from the integration circuit unit, and based on a change in the clock signal due to a difference between the temperature of the atmosphere and the temperature setting value of the heating unit. The second addition unit is configured to add the frequency compensation value to a frequency setting value.
    Type: Application
    Filed: September 26, 2013
    Publication date: March 27, 2014
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: KAZUO AKAIKE, TSUKASA KOBATA, SHINICHI SATO
  • Patent number: 8653897
    Abstract: A thermoelectric device transfers heat away from or toward an object using the Peltier effect. In some embodiments, the length of at least one thermoelectric element is at least ten times greater than a combined average cross-sectional dimension, orthogonal to the length, of two thermoelectric elements.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: February 18, 2014
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Stanley R. Shanfield, Thomas A. Langdo, Marc S. Weinberg, Albert C. Imhoff
  • Patent number: 8629731
    Abstract: A MEMS circuit comprises a MEMS device arrangement with temperature dependent output; a resistive heating circuit; and a feedback control system for controlling the resistive heating circuit to provide heating in order to maintain a MEMS device at a constant temperature. The heating is controlled in dependence on the ambient temperature, such that a MEMS device temperature is maintained at one of a plurality of temperatures in dependence on the ambient temperature. This provides power savings because the temperature to which the MEMS device is heated can be kept within a smaller margin of the ambient temperature.
    Type: Grant
    Filed: November 10, 2009
    Date of Patent: January 14, 2014
    Assignee: NXP, B.V.
    Inventors: Jan Jacob Koning, Jozef Thomas Martinus Van Beek
  • Publication number: 20130335153
    Abstract: There is provided an oscillator capable of lowering the power supply voltage without degrading the phase noise, while employing the conventional circuit configuration. According to one aspect of the present invention, there is provided an oscillator comprising: an oscillation circuit; a bias generation circuit for generating a bias signal to drive the oscillation circuit; and a booster circuit for boosting a power supply voltage to generate a boosted voltage for driving the bias generation circuit. In addition, the oscillation circuit, the bias generation circuit, and the booster circuit are provided in a single IC chip, and the booster circuit may receive the power supply voltage VDD from the power supply arranged at the exterior of the IC chip.
    Type: Application
    Filed: November 12, 2012
    Publication date: December 19, 2013
    Applicant: Asahi Kasei Microdevices Corporation
    Inventor: Haruhiko Maru
  • Publication number: 20130328634
    Abstract: A method in a mobile communication device includes: measuring a first temperature associated with a crystal configured to provide a reference signal having a frequency; measuring a second temperature associated with a component that is coupled to the crystal by an electrically and thermally conductive line; and compensating, based upon the measuring of the first and second temperatures, for a change in the frequency of the reference signal of the crystal.
    Type: Application
    Filed: June 28, 2012
    Publication date: December 12, 2013
    Applicant: QUALCOMM INC.
    Inventors: Daniel Fred Filipovic, Vishal Agarwal
  • Publication number: 20130321088
    Abstract: An oscillator assembly including a base substrate with a cavity defining an insulative air pocket. A component substrate is seated on the base substrate. An oscillator and a combination heater/temperature control assembly are located on one side and a temperature control assembly is located on the opposite side and extends into the cavity. An interior lid covers and defines an oven for the oscillator and the heater/temperature control assembly. An exterior lid covers the interior lid. A thermal resistance/heat transfer element is seated on the oscillator for increasing thermal resistance and is seated on both the oscillator and the heater/temperature control assembly for decreasing thermal resistance.
    Type: Application
    Filed: March 14, 2013
    Publication date: December 5, 2013
    Inventors: Pierino Vidoni, Marc Yvain Pasche, Pierre Krummenacher
  • Publication number: 20130313332
    Abstract: A temperature information generation circuit includes a temperature sensor (a first temperature detection section), a high-sensitivity temperature sensor (one or plural second temperature detection sections) having higher sensitivity than that of the temperature sensor, an output selection circuit, and a control section. The output selection circuit and the control section select a detection signal of the high-sensitivity temperature sensor upon supply of a power supply voltage, and then perform switching so as to select a detection signal of the temperature sensor at a predetermined timing.
    Type: Application
    Filed: May 20, 2013
    Publication date: November 28, 2013
    Applicant: Seiko Epson Corporation
    Inventors: Kensaku ISOHATA, Katsuyoshi TERASAWA
  • Patent number: 8593229
    Abstract: An atomic oscillator includes: a gas cell in which a gaseous metal atom is sealed; first and second heaters heating the gas cell; an exciting light source exciting the metal atom; a light detector detecting the exciting light; a substrate including a temperature controlling circuit for the heaters; a first wiring coupling the first heater and the substrate; a second wiring coupling the second heater and the substrate; and a third wiring coupling the first heater and the second heater. In the atomic oscillator, the gas cell includes a cylinder and windows sealing both ends of the cylinder and constituting an incident surface and an emitting surface on an optical path of the exciting light. The first and second heaters are respectively formed on the windows at an incident surface side and an emitting surface side and are made of transparent heating materials.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: November 26, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Koji Chindo, Taku Aoyama
  • Publication number: 20130293312
    Abstract: An oscillator outputs a control signal to suppress an influence caused by temperature characteristic of f1 based on a differential signal corresponding to difference between an oscillation output f1 of a first oscillator circuit and an oscillation output f2 of a second oscillator circuit treated as a temperature detection value. A switching unit switches between a first state and a second state. The first state is a state where a first connecting end and a second connecting end are connected to a storage unit for access from an external computer to the storage unit. The second state is a state where the first connecting end and the second connecting end are connected to a first signal path and a second signal path such that the respective f1 and f2 are retrieved from the first connecting end and the second connecting end to an external frequency measuring unit.
    Type: Application
    Filed: April 29, 2013
    Publication date: November 7, 2013
    Applicant: Nihon Dempa Kogyo Co., Ltd.
    Inventor: TOMOYA YORITA
  • Publication number: 20130293313
    Abstract: An oscillation circuit including a reference voltage generation circuit that adds a proportional-to-absolute-temperature (PTAT) output, which increases in proportion to an absolute temperature, to a complementary-to-absolute-temperature (CTAT) output, which decreases in proportion to an absolute temperature, to generate and output a reference voltage. The oscillation circuit generates an oscillation signal having a desired and fixed frequency.
    Type: Application
    Filed: July 9, 2013
    Publication date: November 7, 2013
    Inventors: Kazuhiro MITSUDA, Koji Okada, Suguru Tachibana
  • Patent number: 8569808
    Abstract: A semiconductor device with temperature control system. Embodiments of the device may include a MEMS chip including a first heater with a dedicated first temperature control loop and a CMOS chip including a second heater with a dedicated second temperature control loop. Each control loop may have a dedicated temperature sensor for controlling the thermal output of each heater. The first heater and sensor are disposed proximate to a MEMS device in the MEMS chip for direct heating thereof. The temperature of the MEMS chip and CMOS chip are independently controllable of each other via the temperature control loops.
    Type: Grant
    Filed: April 6, 2012
    Date of Patent: October 29, 2013
    Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
    Inventors: Tung-Tsun Chen, Chia-Hua Chu, Chung-Hsien Lin, Jui-Cheng Huang
  • Patent number: 8564376
    Abstract: A physical section of an atomic oscillator includes: a gas cell in which gaseous metal atoms are sealed, and the gas cell includes a first window having optical transparency; a light source that emits excitation light toward the metal atoms through the first window; a first heating unit that disposes at the first window and that is located between the first window and the light source; and a Peltier element that is stacked on the first heating unit, that is located between the first heating unit and the light source, and that decreases a temperature of a side of the Peltier element facing the light source than a temperature of an opposite side of the Peltier element facing the gas cell.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: October 22, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Koji Chindo, Taku Aoyama
  • Patent number: 8531248
    Abstract: An oscillator includes a positive power supply node for providing a positive power supply voltage; a capacitor; and a constant current source providing a first constant current and coupled to the positive power supply node. The first constant current is independent from the positive power supply node. The oscillator also includes a charging current source configured to provide a second constant current to charge the capacitor, wherein the second constant current mirrors the first constant current. The oscillator further includes a constant current source inverter having a third constant current mirroring the first constant current. The constant current source inverter is configured to control the oscillator to transition state at a constant state transition voltage.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: September 10, 2013
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventor: Yi-Tzu Chen