WO1998027652A1 - Circuit de compensation thermique pour un oscillateur a quartz et procede de fabrication dudit circuit - Google Patents
Circuit de compensation thermique pour un oscillateur a quartz et procede de fabrication dudit circuit Download PDFInfo
- Publication number
- WO1998027652A1 WO1998027652A1 PCT/US1997/021618 US9721618W WO9827652A1 WO 1998027652 A1 WO1998027652 A1 WO 1998027652A1 US 9721618 W US9721618 W US 9721618W WO 9827652 A1 WO9827652 A1 WO 9827652A1
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- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- crystal oscillator
- circuit
- memory
- signal
- Prior art date
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title description 7
- 238000004891 communication Methods 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 230000006870 function Effects 0.000 claims description 11
- 230000004044 response Effects 0.000 claims description 11
- 230000001419 dependent effect Effects 0.000 claims description 4
- 230000002401 inhibitory effect Effects 0.000 claims 2
- 230000008859 change Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000002411 adverse Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/022—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature
- H03L1/023—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature by using voltage variable capacitance diodes
- H03L1/025—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature by using voltage variable capacitance diodes and a memory for digitally storing correction values
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
- H03B5/366—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device and comprising means for varying the frequency by a variable voltage or current
- H03B5/368—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device and comprising means for varying the frequency by a variable voltage or current the means being voltage variable capacitance diodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes
- H03J7/12—Combination of automatic frequency control voltage with stabilised varactor supply voltage
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/028—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only of generators comprising piezoelectric resonators
Definitions
- the present invention relates generally to crystal oscillators used in a radio communication device and, in particular, to a temperature compensation circuit for a crystal oscillator and method of providing the same.
- a crystal oscillator is typically used to provide a reference frequency signal for a radio communication device.
- Temperature compensation (TC) circuits have typically been provided within the crystal oscillator to provide frequency stabilized radio communications over a wide range of temperatures. These compensation circuits may be composed of analog or digital devices and are used to provide a relatively flat frequency output over temperature.
- TC Temperature compensation
- a variable capacitive element is provided to allow absolute adjustment of the final frequency of the oscillator. This capacitive element is generally either in the form of a trim capacitor or an analog varactor controlled by an applied DC voltage. By adjusting this capacitance, the user is able to adjust (frequency trim) the oscillator onto a desired final frequency.
- temperature compensated crystal oscillators provide about a 5 parts per million (ppm) frequency stability over temperature.
- the variation of operating frequency over temperature of a radio communication device depends not only on the reference crystal but also on associated circuit elements that are temperature sensitive.
- Analog varactcrs have their own variation with temperature, separate from the crystal temperature variation, which must be controlled by an applied voltage, as well as being compensated along with the crystal temperature variation. Therefore, a varactor will change capacitance over temperature even if provided with a constant voltage.
- a constant voltage is difficult to achieve because voltage regulators change output voltage over temperature even if provided with a constant input voltage.
- a very stable regulated voltage is required for good temperature performance of a varactor by itself. However, this requires the use of a more expensive voltage regulator circuit which is often not an option.
- an external temperature sensitive voltage supplied to a crystal oscillator from an uncompensated radio communication device circuit, a D/A converter for example, will adversely affect the temperature performance of a crystal oscillator.
- adjusting the varactor while the radio is transceiving will change the operating frequency and possible disrupt the communication.
- a temperature compensated reference frequency source which: achieves temperature compensation with more simplified circuitry; does not require dedicated memory to store temperature compensation values, allows fewer, less expensive elements to be used, and provides temperature compensation of the crystal oscillator and other circuit elements coupled to the crystal oscillator.
- FIG. 1 is a block diagram of a temperature compensation circuit for a crystal oscillator, in accordance with the present invention
- FIG. 2 is a schematic diagram of a preferred embodiment of the circuit of FIG. 1 , in accordance with the present invention
- FIG. 3 is a block diagram of a communication device which uses the temperature compensation circuit of the present invention.
- FIG. 4 is a flow diagram of a method to provide a temperature compensated frequency output, in accordance with the present invention.
- FIG. 1 shows a temperature compensation circuit 10 providing a substantially temperature compensated frequency output 20, in accordance with the present invention.
- a memory 28 is used to provide temperature compensation digital data 30 to a crystal oscillator module 12 via a signal generator 32.
- the memory 28 is an existing device on a radio circuit board 14 which saves costs.
- the signal generator 32 is powered by a regulated voltage 36 from a voltage regulator 34 that has been characterized over temperature.
- the voltage regulator 34 is located within the crystal oscillator module 12 for ease of temperature characterization.
- the signal generator 32 can be located on either the radio circuit board 14 or the crystal oscillator module 12.
- the signal generator 32 is an existing device on the radio circuit board 14 which saves costs. It should be recognized that having the signal generator 32 on the radio circuit board 14 would require additional input-output pins on the crystal oscillator module 12 to accommodate the digital data 30.
- radio circuitry is not temperature compensated which leads to errors over temperature. This is particularly evident when driving temperature sensitive devices, such as crystal oscillators, with signals that have not been temperature compensated. For example, a signal generator being powered by an uncharacterized voltage regulator and driving a crystal oscillator with a temperature compensation signal will introduce errors due to shifts in the uncharacterized regulated voltage over temperature.
- Prior art crystal oscillators attempted to solve this problem by incorporating all the temperature sensitive circuitry, including a voltage regulator and a memory with temperature compensation data within a module which is subsequently characterized over temperature. However, this approach requires the use of a larger sized module to hold all the components with an expensive on-board application specific integrated circuit (ASIC) memory.
- ASIC application specific integrated circuit
- the present invention solves these problems by using an existing external memory 28 which saves costs, and by powering the signal generator 32 with the voltage regulator 34 within the crystal oscillator module 12 which has been characterized over temperature along with the crystal oscillator 18 and an associated tuning circuit 16. In this way, the present invention no longer requires an on-board ASIC, and surprisingly, a substantially improved temperature compensated output frequency 20 is obtained.
- the present invention advantageously provides temperature compensation of the crystal oscillator 18 and tuning circuit 16 as well as the signal generator 32 while using existing memory 28 of a radio instead of a separate memory on-board the crystal oscillator module 12.
- Another problem with independent digitally compensated crystal oscillators 18 is where the temperature compensation orders a change in frequency in response to a temperature change while the radio is transceiving.
- the present invention solves this problem by allowing the radio to determine when to provide a temperature compensation correction.
- the radio can inhibit a change to the temperature compensation during transmissions since the compensation is dependent on the existing external memory of the radio. In this way, sudden frequency changes during transmitting or receiving are eliminated.
- the temperature compensation circuit 10 for the crystal oscillator 18 includes a tuning circuit 16 electrically coupled to the crystal oscillator 18.
- the tuning circuit 16 contains a reactive load which is coupled to the crystal oscillator 18 and is used to adjust an output frequency 20 of the crystal oscillator 18 in response to a temperature compensation signal 22.
- a temperature sensor 24 in the crystal oscillator module 12 provides a temperature signal 26 in response to an ambient temperature of the crystal oscillator 18.
- a memory 28 is electrically coupled to the temperature sensor 24 and is programmed to provide predetermined digital data 30 in response to the temperature signal 26.
- the predetermined digital data is programmed to vary as a function of a frequency deviation of the crystal oscillator module 12 over temperature.
- the predetermined digital data 30 is programmed to also compensate a reactance variation of the tuning circuit 16 and a voltage variation of a voltage regulator 34 over temperature.
- the voltage regulator 34 is electrically coupled to the temperature sensor 24 with a regulated voltage 36.
- a signal generator 32 is electrically coupled to the memory 28.
- the signal generator 32 may be located either within the crystal oscillator module 12 or on the radio circuit board 14, as shown.
- the signal generator 32 provides a temperature compensation signal 22, corresponding to the predetermined digital data 30 from the memory 28, to the tuning circuit 16.
- Uncompensated voltage regulators have a volts per degree C (V/°C) dependence that, when applied to the signal generator 32, will cause the compensation signal to follow the change in volts over temperature.
- the characterized voltage regulator 34 of the crystal oscillator module 12 supplies a regulated voltage 36 to power the signal generator 32.
- This characterization information is summed into the information supplied with the oscillator module 12.
- the temperature sensor 24, tuning circuit 16 and voltage regulator 34 data is recorded. This data is then used to compute the required compensation signal 22 to the signal generator 32, and the data is supplied with each oscillator module 12 to an end user radio communication device manufacturer. Because the voltage regulator 34 of the crystal oscillator module 12 has been temperature characterized, along with the crystal oscillator 18 itself and the tuning circuit 16, this characterized regulated voltage 36 can be used beneficially to power the signal generator 32.
- the temperature compensation signal 22 from the signal generator 32 is inherently compensated for voltage variations of the voltage regulator 34 over temperature. This improves the overall temperature compensation performance of the temperature compensation circuit 10, where the generated compensation signal 22 from the signal generator 32 is more accurate due to the characterized information supplied with the oscillator module 12.
- FIG. 2 shows a schematic diagram of a preferred embodiment of the temperature compensation circuit 10 of FIG. 1 , in accordance with the present invention.
- This embodiment includes a frequency trim signal 38 coupled to the tuning circuit 16.
- the tuning circuit 16 adjusts a nominal output frequency of the crystal oscillator 18.
- the frequency trim signal 38 is supplied externally from the crystal oscillator module 12, typically via an automatic frequency control (AFC) circuit.
- AFC automatic frequency control
- the signal generator 32 is most easily provided by a digital- to-analog (D/A) converter. However, other similar circuits may be used. In general, the D/A converter utilized is located on the radio circuit board 14. However, it may be located within the crystal oscillator module 12 if appropriate data connections are made.
- D/A digital- to-analog
- the signal generator 32 is an existing D/A converter on the radio board which is utilized part of the time for occasional radio functions and is available the remaining time for temperature compensation.
- the signal generator 32 provides at least one latched output buffer (not shown) for the compensation signal 22 in order to maintain the compensation when the D/A converter is busy performing its radio tasks.
- the D/A is multiplexed between radio functions and providing a temperature compensation signal for crystal oscillator compensation.
- this embodiment also allows the radio to provide a change in temperature compensation only when the radio is not transmitting or receiving. In addition, the cost of an extra D/A converter on the radio board is avoided.
- Prior art D/A converters are powered off of the radio power supply voltage regulator (not shown).
- a surprising and unexpected advantage of the present invention is to instead power the D/A converter off of the voltage regulator 34 of the crystal oscillator module 12. Better than 2 ppm temperature stability of the output frequency 20 is achieved by biasing the D/A converter off of the temperature characterized regulated voltage 36 of the crystal oscillator module 12. Since the D/A converter is running off of the voltage regulator 34 of the crystal oscillator module 12, the D/A output (temperature compensation signal 22) is much more accurate over temperature than it would be if the D/A converter is biased off of the uncharacterized radio power supply regulator.
- the crystal oscillator module 12 will use the regulated voltage 36 of the voltage regulator 34 to bias a D/A converter 32 with approximately the same input impedance as a prior art radio D/A converter so as to maintain a uniform temperature compensation.
- a D/A converter 32 with approximately the same input impedance as a prior art radio D/A converter so as to maintain a uniform temperature compensation.
- An alternative to the above embodiment is for the radio manufacturer to temperature characterize the power supplies of every radio for the benefit of the crystal oscillator manufacturer.
- the temperature sensor 24 may be provided by a cascaded diode string of at least one diode, a thermistor, or a transistor. Of these, the diode string is the lowest cost. Thermistors typically have manufacturing tolerance variations from lot to lot, and unit to unit. A diode string can be integrated, and therefore, manufactured to be substantially exactly matched in geometry and current flow. In a preferred embodiment, the temperature sensor consists of two integrated cascaded diodes. Integration allows the diodes to be fabricated such that they are well matched in geometry and therefore in current flow which is an advantage for providing a repeatable voltage across the diode string.
- the temperature sensor of the present invention preferably uses two cascaded diodes which results in a temperature signal of 2VQ.
- Vn is about 0.6V at room temperature and the temperature sensor has a temperature signal sensitivity of about 4 mV/°C which is very repeatable due to the integrated manufacturing process used in the present invention.
- the diodes of the temperature sensor will fundamentally have a fixed ratio for (JD/' O )-
- this information can be permanently stored in the memory without having to actually determine the temperature variance on a diode-to- diode basis.
- each temperature sensor can be characterized over temperature for ultimate accuracy. However, this requires more data processing and is not necessary to realize the 2 ppm temperature stability of the present invention.
- a larger number of diodes in the diode string provides increased temperature sensitivity. However, this must be balanced against the available supply potential of the radio since only a higher potential will support more diodes in the diode string. In the low voltage power supply embodiment shown, two diodes are cascaded in the diode string.
- the tuning circuit 16 is provided by a reactive load, such as varactor diodes connected as shown, coupled to the crystal oscillator 18.
- a reactive load such as varactor diodes connected as shown
- the crystal oscillator is of a Colpitts design which is known in the art.
- the varactor diodes provide a low cost method of providing variable reactance.
- VVCs voltage variable capacitors
- the memory 28 is best provided through an existing memory element located within the radio or communication device. Most advantageously, the memory 28 is the main microprocessor or microcontroller of the radio since this is already existing. However, other available memory devices may be used, such as digital signal processors, PROM, EPROM, EEPROM, SRAM, DRAM, digital-to-analog converters, and the like, whether pre-existing in the radio or provided separately.
- the advantage of using existing memory devices is that a separate, redundant memory element is no longer needed in the crystal oscillator module 12 which provides a substantial cost savings.
- a memory device is available that has an analog output, such as having an on-board D/A then the signal generator 32 of the present invention can be eliminated. However, it should be noted that in this case it would be necessary to drive the memory device with the voltage regulator 34 of the crystal oscillator module 12 to retain the temperature characterized benefits discussed above.
- the memory 28 is programmed with predetermined digital data 30 which substantially corresponds to an inverse function of the frequency deviations of the crystal oscillator module 12 over temperature.
- the inverse function corresponds to the well known Bechmann curve, which can be well characterized by a third or higher nth-order polynomial expansion.
- a fourth order expansion is preferred for its additional accuracy in characterizing the Bechmann curve.
- higher order best-fit polynomials (n > 7) will provide greater accuracy.
- the polynomial coefficients of the Bechmann curve are calculated for each crystal oscillator module 12 and these values are programmed into the memory 28.
- the memory 28 may be programmed with a look-up table of actual frequency deviations of the crystal oscillator module 12 over discrete temperature ranges which may be called up and provided to the signal generator 32 as digital data 30.
- the digital data 30 in the look-up table would correspond to the temperature signal 26 provided by the temperature sensor 24 to the memory 28. This alternative requires more memory space, but will work equally well.
- the deviations in the voltage regulator 34 and tuning circuit 16 over temperature are automatically incorporated within the predetermined digital data 30 since the crystal oscillator module 12 is temperature characterized as a whole unit.
- the memory 28 provides digital data 30 corresponding to the inverse function of the Bechmann curve to the signal generator 32 for translation into an analog temperature compensation signal 22 for driving the tuning circuit 16 of the crystal oscillator module 12.
- the memory 28 and signal generator 32 need not be temperature characterized because their deviations over temperature are inconsequential. However, there is nothing in the present invention to prevent doing this.
- the advantage of the present invention is to have the signal generator 32, preferably a D/A converter, biased off of the crystal oscillator module voltage regulator 34, whose voltage variation over temperature is characterized.
- the temperature compensation signal 22 from the D/A converter is inherently corrected, for voltage variations in the voltage regulator 34, in accordance with the present invention.
- biasing the D/A converter off of the crystal oscillator module voltage regulator 34 results in an improvement in frequency stability from about 5 ppm to about 2 ppm.
- this improvement is achieved without the use of ASIC temperature compensation circuitry on-board the crystal oscillator module 12 which results in a significant cost savings.
- FIG. 3 shows a block diagram of a communication device
- the communication device 200 which includes a temperature compensated circuit, in accordance with the present invention.
- the communication device 200 is a transceiver.
- the communication device 200 comprises a well known frequency synthesized two-way transceiver which operates under the control of a microcontroller 210 or microprocessor.
- the communication device 200 includes a receiver 220 and a transmitter 230 which receive and transmit RF via an antenna 240.
- the antenna 240 is appropriately switched between the receiver 220 and the transmitter 230 by an antenna switch 250.
- the communication device 200 also includes a well known phase locked loop synthesizer 260 which under the control of the microcontroller 210 provides a receiver local oscillator signal 262 and a transmitter local oscillator signal 264.
- the temperature compensated circuit includes a reference oscillator module 300 providing a reference oscillator signal 272 for the synthesizer 260 and a temperature signal 280 for the microcontroller 210.
- the microcontroller 210 provides a temperature compensation signal 290 to the reference oscillator module 300 via a signal generator 292.
- the reference oscillator signal 272 is temperature compensated utilizing the principles of the present invention.
- FIG. 4 shows a flow diagram of a method 400 to provide a temperature compensated reference frequency output, in accordance with the present invention.
- This method 400 includes a first step 402 of providing a memory programmed with digital data corresponding to a deviation over temperature of at least one of the group selected from the crystal oscillator, a signal generator, a voltage regulator, a temperature sensor, and a tuning circuit coupled to the crystal oscillator.
- a second step 404 includes driving the temperature sensor with the voltage regulator such that a temperature-dependent signal corresponding to an ambient temperature is provided.
- a third step 406 includes coupling the temperature-dependent signal to the memory such that digital data corresponding to the frequency variation of the crystal oscillator at the ambient temperature is provided.
- a fourth step 408 includes applying the digital data to the signal generator when an associated radio circuit is not transmitting or receiving such that a temperature compensation signal is provided to the tuning circuit of the crystal oscillator.
- a last step 410 includes biasing the signal generator with a temperature characterized regulated voltage from the voltage regulator such that variations in the regulated voltage are compensated in the digital data so as to improve temperature compensation of the crystal oscillator.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019980706277A KR100290498B1 (ko) | 1996-12-17 | 1997-11-25 | 수정 발진기용 온도 보상 회로 및 그 제조 방법 |
JP10527723A JP2000507073A (ja) | 1996-12-17 | 1997-11-25 | 水晶発振器のための温度補償回路および温度補償を提供する方法 |
EP97948526A EP0886921A4 (fr) | 1996-12-17 | 1997-11-25 | Circuit de compensation thermique pour un oscillateur a quartz et procede de fabrication dudit circuit |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/768,154 US5760656A (en) | 1996-12-17 | 1996-12-17 | Temperature compensation circuit for a crystal oscillator and associated circuitry |
US08/768,154 | 1996-12-17 | ||
US08/901,892 US5777524A (en) | 1997-07-29 | 1997-07-29 | Temperature compensation circuit for a crystal oscillator and associated circuitry |
US08/901,892 | 1997-07-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998027652A1 true WO1998027652A1 (fr) | 1998-06-25 |
Family
ID=27118014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/021618 WO1998027652A1 (fr) | 1996-12-17 | 1997-11-25 | Circuit de compensation thermique pour un oscillateur a quartz et procede de fabrication dudit circuit |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0886921A4 (fr) |
JP (1) | JP2000507073A (fr) |
KR (1) | KR100290498B1 (fr) |
CN (1) | CN1211354A (fr) |
WO (1) | WO1998027652A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001069775A1 (fr) * | 2000-03-17 | 2001-09-20 | Asahi Kasei Microsystems Co., Ltd. | Oscillateur a quartz thermocompense et procede de compensation thermique |
GB2335554B (en) * | 1998-03-18 | 2002-01-16 | Roke Manor Research | Radio synchronisation system |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100457192B1 (ko) * | 2002-06-17 | 2004-11-16 | 주식회사 팬택앤큐리텔 | 단말기 주파수 오차 보정 장치 및 방법 |
US7042301B2 (en) * | 2002-10-15 | 2006-05-09 | Marvell International Ltd. | Crystal oscillator emulator |
JP4564956B2 (ja) * | 2003-04-11 | 2010-10-20 | エヌエックスピー ビー ヴィ | 発振器結晶の温度を検出する装置 |
US7417510B2 (en) * | 2006-09-28 | 2008-08-26 | Silicon Laboratories Inc. | Direct digital interpolative synthesis |
JP2009004918A (ja) * | 2007-06-19 | 2009-01-08 | Sharp Corp | 携帯通信端末及びその温度補償方法 |
JP2009060227A (ja) * | 2007-08-30 | 2009-03-19 | Oki Electric Ind Co Ltd | 無線受信装置、無線送信装置及び無線送受信装置 |
US20090108949A1 (en) * | 2007-10-30 | 2009-04-30 | Qualcomm Incorporated | Temperature compensation for crystal oscillators |
JP2011066733A (ja) * | 2009-09-18 | 2011-03-31 | Mitsumi Electric Co Ltd | スーパーヘテロダイン方式の受信装置及び受信方法、並びに受信装置用半導体集積回路 |
CN102025320B (zh) * | 2010-11-25 | 2013-01-23 | Tcl集团股份有限公司 | 一种提高wifi接入点频率稳定度的装置和方法 |
CN202270782U (zh) | 2011-09-05 | 2012-06-13 | 浙江胜利工贸有限公司 | 金属材料校直机 |
CN103138700B (zh) * | 2013-02-02 | 2015-12-02 | 浙江雅晶电子有限公司 | 一种晶振自动调频机 |
JP6569266B2 (ja) * | 2015-03-27 | 2019-09-04 | セイコーエプソン株式会社 | 発振器、電子機器、および移動体 |
US10171090B2 (en) * | 2015-03-27 | 2019-01-01 | Seiko Epson Corporation | Oscillator, electronic apparatus, and moving object |
JP6623535B2 (ja) * | 2015-03-27 | 2019-12-25 | セイコーエプソン株式会社 | 発振器、電子機器、および移動体 |
JP6572587B2 (ja) * | 2015-03-27 | 2019-09-11 | セイコーエプソン株式会社 | 発振器、電子機器、および移動体 |
JP6638340B2 (ja) * | 2015-11-12 | 2020-01-29 | セイコーエプソン株式会社 | 回路装置、発振器、電子機器及び移動体 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US4746879A (en) * | 1986-08-28 | 1988-05-24 | Ma John Y | Digitally temperature compensated voltage-controlled oscillator |
US5081431A (en) * | 1990-01-26 | 1992-01-14 | Nihon Dempa Kogyo Co., Ltd. | Digital temperature-compensated oscillator |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5204975A (en) * | 1989-10-12 | 1993-04-20 | Seiko Epson Corporation | Digitally-corrected temperature-compensated crystal oscillator having a correction-suspend control for communications service |
JPH08288741A (ja) * | 1995-04-14 | 1996-11-01 | Matsushita Electric Ind Co Ltd | 水晶発振装置とその調整方法 |
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1997
- 1997-11-25 JP JP10527723A patent/JP2000507073A/ja active Pending
- 1997-11-25 EP EP97948526A patent/EP0886921A4/fr not_active Withdrawn
- 1997-11-25 CN CN97192279A patent/CN1211354A/zh active Pending
- 1997-11-25 WO PCT/US1997/021618 patent/WO1998027652A1/fr not_active Application Discontinuation
- 1997-11-25 KR KR1019980706277A patent/KR100290498B1/ko not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4746879A (en) * | 1986-08-28 | 1988-05-24 | Ma John Y | Digitally temperature compensated voltage-controlled oscillator |
US5081431A (en) * | 1990-01-26 | 1992-01-14 | Nihon Dempa Kogyo Co., Ltd. | Digital temperature-compensated oscillator |
Non-Patent Citations (1)
Title |
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See also references of EP0886921A4 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2335554B (en) * | 1998-03-18 | 2002-01-16 | Roke Manor Research | Radio synchronisation system |
WO2001069775A1 (fr) * | 2000-03-17 | 2001-09-20 | Asahi Kasei Microsystems Co., Ltd. | Oscillateur a quartz thermocompense et procede de compensation thermique |
GB2363269A (en) * | 2000-03-17 | 2001-12-12 | Asahi Chemical Micro Syst | Temperature-compensated crystal oscillator and method of temperature compensation |
US6603364B2 (en) | 2000-03-17 | 2003-08-05 | Asahi Kasei Microsystems Co., Ltd. | Temperature-compensated crystal oscillator and method of temperature compensation |
GB2363269B (en) * | 2000-03-17 | 2004-02-18 | Asahi Chemical Micro Syst | Temperature-compensated crystal oscillator and method of compensating temperature thereof |
Also Published As
Publication number | Publication date |
---|---|
EP0886921A4 (fr) | 2000-03-08 |
EP0886921A1 (fr) | 1998-12-30 |
KR19990082540A (ko) | 1999-11-25 |
CN1211354A (zh) | 1999-03-17 |
JP2000507073A (ja) | 2000-06-06 |
KR100290498B1 (ko) | 2001-06-01 |
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