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JP4624796B2 |
A control unit supplies a new control value to a frequency source. The value is determined by the frequency source frequency and the reference frequency. The control unit further calculates a rate of change value based at least on the ne...
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JP4620188B2 |
The oscillator has an oscillation loop (L,C,R) and an amplifier circuit connected as virtually negative resistance. A current source is connected in series with the oscillation loop to determine a signal for the resistance of the oscilla...
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JP4620931B2 |
A clock generator for automatic test equipment employs an improved technique for generating clock signals from a reference clock. To generate a desired clock signal, a clock generator produces a time-quantized signal having a period equa...
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JP4607108B2 |
In a method for synchronizing a mobile station with the base station in a mobile communication system, a reference-frequency oscillator is re-adjusted. To enable an inexpensive reference-frequency oscillator of simple construction to be ...
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JP2010278491A |
To provide a frequency synthesizer for increasing variation resistance and compensating the frequency variation of a VCO when a temperature fluctuates.The VCO 5, a phase comparator 2 for phase-comparing signals 22 for which the oscillati...
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JP2010273063A |
To provide an oscillation circuit with temperature characteristic correction function without using a memory for correcting an oscillation frequency or the like, and a manufacturing method for the oscillation circuit.The oscillation circ...
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JP2010263504A |
To provide an electronic apparatus for reducing size and costs as compared with a case when a double oven type OCXO is used while maintaining frequency stability the same as the case when the double oven type OCXO is used.A base station ...
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JP2010263503A |
To provide a communication apparatus to be operated by using a highly precise clock signal without using a double oven type OCXO even during a period in which a GPS signal can not be normally received.A radio base station includes: a gen...
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JP2010252126A |
To provide a PLL circuit capable of reducing deterioration in phase noise caused by temperature variation.The PLL circuit 100 includes: a voltage controlled oscillator circuit 81; a frequency divider 82; a phase comparator which compares...
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JP4564956B2 |
In a device for detecting the temperature of an oscillator crystal 2 , arranged on a carrier, in particular in a mobile radio apparatus, the detected temperature should be as exact as possible a replica of the temperature to which the os...
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JP4542598B2 |
A VCO circuit includes a temperature detector circuit, a voltage generator circuit, a switch, a resonance circuit and an oscillator. The temperature detector detects a temperature, and the voltage generator circuit generates a voltage fo...
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JP2010200289A |
To provide a reference frequency control circuit for suppressing the change of the oscillation frequency of an oscillator circuit which generates a reference frequency.A reference frequency control circuit includes: a frequency voltage c...
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JP4513742B2 |
A characteristic automatic compensating apparatus of an oscillator includes oscillating means, temperature detecting means, characteristic determining means for measuring a drift value of an oscillating frequency while changing the tempe...
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JP2010161343A |
To provide a temperature-compensated-resistance (TCR) circuit, which may be a part of an integrated circuit. The TCR circuit 100 includes two resistors 110, 120 and a diode 130. The two resistors are connected in parallel and the diode i...
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JP4499457B2 |
A quartz crystal oscillator in which phase noise is reduced includes: a resonance circuit having a quartz crystal unit and a split capacitor connected to the crystal unit; a transistor for oscillation having its base connected to the nod...
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JP4487937B2 |
A microcomputer includes an oscillator for generating a clock signal having a frequency by using a CR circuit, a multiplier for outputting the clock signal having a multiplied frequency relative to the frequency generated by the oscillat...
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JP2010119074A |
To provide a control circuitry which corrects a temperature drift possibly occurring to a synthesizer during a continuous operation.The control circuitry comprises: first control means operable to generate a first control signal, the fir...
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JP4462371B2 |
To generate a clock signal having accurate frequency, even if a CR oscillation circuit is subjected to temperature change or aging change. An A/D conversion value indicating the temperature of a CR oscillator 12 and a multiplier setting ...
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JP4460588B2 |
There is disclosed a self-calibrating resistor-capacitor (RC) oscillator in which a resistor has a resistance value varied minimally by temperature change and process variation, a capacitor has a capacitance value selected adequately acc...
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JP2010103671A |
To furthermore reduce the power consumption of a semiconductor integrated circuit for a real-time clock and to make a generated clock signal available even in peripheral circuits.The semiconductor integrated circuit includes:a constant v...
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JP4459911B2 |
The invention relates to a digital synchronization network, and provides a DPLL circuit having a holdover function that generates a high-precision reference clock with a temperature correction to perform a free-running frequency control ...
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JP4452444B2 |
The present invention quantifies and reduces losses in tunable bandpass filters having ferro-electric capacitors. Given a required insertion loss and the quality factor of a resonator, the geometric losses resulting from a particular top...
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JP2010088123A |
To provide a piezoelectric oscillator shortening an acquisition time of a positioning signal of a GPS satellite by using a piezoelectric oscillator having no temperature compensating circuit incorporated, and also to provide a reception ...
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JP4450729B2 |
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JP4405426B2 |
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JP2009545195A |
The present invention relates to a Voltage-Controlled Oscillator (VCO) and to use of the VCO in a high-temperature sensor transceiver. The VCO has a voltage input and a frequency of oscillation dependent on the voltage input. The VCO inc...
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JP2009268122A |
To provide a tunable matching circuit of low-loss in RF.A ferroelectric material is used in order to produce a low-loss tunable capacitor 32 and inductor 31 for using in a matching circuit 22. The matching circuit 22 is provided with a c...
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JP2009260598A |
To provide a configuration for achieving efficient and highly accurate correction of data for correcting the temperature characteristics of a reference oscillation part in radio communication apparatus for generating the transmission/rec...
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JP4354347B2 |
A crystal oscillator of the present invention includes: a substrate (3) provided in a package; a heating device (4,81,82) arranged as surrounding an internal area of the substrate (3) on at least one of the surfaces of the substrate (3);...
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JP4345549B2 |
A thin and highly stable piezoelectric oscillator is provided with a piezoelectric vibrator, a mother printed board which supports a piezoelectric vibrator main body on its one face and connects lead terminals to a wiring pattern, oscill...
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JP4343273B2 |
Micromachined, thermally insensitive silicon resonators are provided having accuracy equivalent or superior to that of quartz resonators, and are fabricated from a micromechanical, silicon-on-glass process. In one embodiment, such a reso...
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JP4319408B2 |
A LC controllable oscillator (LCCO) according to the invention comprises a voltage-controlled oscillator (VCO) and a first voltage controlled current source (VCCS) of a first type for supplying a current to the VCO. The VCO is realized w...
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JP4286304B2 |
The present invention quantifies and reduces losses in tunable bandpass filters having ferro-electric capacitors. Given a required insertion loss and the quality factor of a resonator, the geometric losses resulting from a particular top...
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JP2009130670A |
To provide a stable oscillation frequency by automatically setting frequency deviation to 0 ppm for each oscillator, and also to provide further a stable oscillation frequency by also taking temperature deviation into account.A system co...
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JP4267828B2 |
Methods and systems are provided for frequency generation suitable for use in wireless devices capable of operating at multiple frequencies. Such systems may change the loop gain of an automatic frequency control loop based on the operat...
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JP4268205B2 |
The present invention quantifies and reduces losses in tunable bandpass filters having ferro-electric capacitors. Given a required insertion loss and the quality factor of a resonator, the geometric losses resulting from a particular top...
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JP4270339B2 |
A bias current IB additionally provided to a current-controlled circuit 13 in a PLL circuit is the sum of bias currents IB1 and IB2 which are generated by a bias adjustment circuit (18, 19, 20, 21 and 22) and a bias current generating ci...
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JP4258897B2 |
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JP4257499B2 |
In order to always maintain a frequency of an oscillator within a proper range, the frequency chages due to temperature and a secular change, a method is disclosed in which the secular change is calculated from past control information, ...
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JP4251070B2 |
A piezoelectric resonator for an oscillator contained in an upper concave portion of an insulating case that has a metal lid with which the upper concave portion is air-tightly closed comprises a GND electrode being conductively coupled ...
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JP4240051B2 |
An atomic oscillator includes: a gas cell encapsulating a rubidium atom; a gas cell holding member holding the gas cell; a rubidium lamp exciting the rubidium atom in the gas cell; a lamp holding member holding the rubidium lamp; a tempe...
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JP2009033674A |
To provide a cubic temperature characteristic compensation voltage generation circuit that permits ease of control across a wide band when the cubic temperature characteristic compensation voltage is controlled such that the cubic compon...
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JP2008301410A |
To suppress a phase change of an output signal with respect to the temperature change in an oscillation circuit.A phase compensation circuit 11 inputs a reference signal Sr, compensates the phase of the reference signal Sr and outputs it...
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JP2008289139A |
To provide an IC for control of a temperature-compensated crystal oscillator that is capable of using terminals in common and reducing a possibility of malfunction occurrence.A temperature-compensated crystal oscillator includes a mode s...
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JP2008278506A |
To afford a simple stabilization of the temperature behavior of an oscillator and to allow the low price manufacture of proximity switches, having a great switching distance, which function safely in a broad temperature range.In an oscil...
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JP2008271599A |
To obtain a circuit configuration for compensation of leakage currents in a voltage-controlled oscillator of a PLL circuit.A control voltage applied to the oscillator by way of a loop filter (20)is generated by a phase detector (16) as a...
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JP2008228315A |
To provide a preferable integrated ceramic inverted-F ferroelectric antenna.The inverted-F ferroelectric antenna includes a counterpoise 102, a ceramic block, an inverted-F structure radiator 104, a bias voltage feed 300 metal inlay, a g...
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JP2008219900A |
To provide a narrowband resonant circuit for measuring the loss of the ferroelectric component.A tunable ferroelectric component (610 to 614) and a narrowband resonant circuit (610 to 620) for measuring the loss of the ferroelectric comp...
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JP2008211478A |
To provide a mobile radio equipment which communicates in two modes of communicating through a base station and communicating directly with other mobile radio equipment not through the base station and generates a transmission frequency ...
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JP2008182767A |
To provide a crystal oscillator that is excellent in IC element bonding reliability and meets the need for the size reduction of the entire structure.The present invention relates to a crystal oscillator comprising: a container accommoda...
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