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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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JP4127084B2 |
The present invention relates to a sensor apparatus capable of outputting an accurate sensor signal irrespective of a variation of power supply voltage. In the sensor apparatus, when an A/D conversion circuit produces and outputs digital...
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JP2008167474A |
To provide FE dielectric-tuned antennas and a method for frequency tuning a wireless communications antenna.The method comprises forming a radiator; forming a dielectric with ferroelectric material proximate to the radiator; applying a v...
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JP4118142B2 |
A receiver uses an adaptive algorithm to tune a low-cost crystal oscillator according to a temperature compensation profile so as to produce a precision master reference frequency despite temperature, initial tolerance, and aging effects...
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JP4094576B2 |
An oscillator circuit includes a current source for generating a current depending on the ambient temperature, a plurality of oscillators for oscillating at respective periods depending on the current from the current source and based on...
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JP4077322B2 |
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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JP4070492B2 |
A circuit with variation correction function is capable of obtaining an output characteristic near a desired value by suppressing variation of the output characteristic regardless of manufacturing characteristic variations of a component...
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JP2008072740A |
To provide an appropriate tunable multiplexer.The present invention provides a tunable ferro-electric multiplexer for use in CDMA communication devices. Tunable ferro-electric capacitors are used to tune the resonant frequencies of sever...
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JP4066997B2 |
A variable frequency oscillator having multiple, independent frequency control inputs, each coupled to a respective tuning sub-circuit. The tuning sub-circuits are connected in parallel with each other and with a resonator module, which ...
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JP4062135B2 |
A high-frequency oscillation apparatus wherein an oscillation signal output from a voltage controlled oscillator (VCO) is transferred through a transfer line to a resonator and the resonator is excited. The resonator is coupled with a se...
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JP4060424B2 |
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JP4050618B2 |
An oscillating circuit (10) includes a quartz crystal oscillator (12) for generating a clock signal (20). The clock signal is synchronized to a master signal (19) during the lock-in periods when the oscillating circuit (10) has access to...
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JP2008035569A |
To provide an enhanced tunable f-e filter capable of providing a tunable range higher than a desired frequency domain through low I. L. and out-of-high-band rejection, and a method of designing the filter.The present invention quantifies...
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JP2008028804A |
To provide a circuit which obtains a stable frequency or a delay element when a reference frequency is obtained.A switchover device 5 alternately selects, in chronologic order, a first oscillation circuit 6 composed of a first impedance ...
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JP4044027B2 |
In a function generating circuit which comprises a temperature sensor 1 for outputting an output current (Ilin) with a linear temperature characteristic or an output voltage (Vlin) with the linear temperature characteristic, a cubic func...
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JP4043683B2 |
An operating parameter of an integrated circuit is made substantially insensitive to process variations by configuring the circuit such that an environmental parameter, e.g., supply voltage to a portion of the circuit, is made a function...
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JP2008022585A |
To provide an appropriate tunable multiplexer.A tunable ferro-electric multiplexer for use in CDMA communication device is provided. Tunable ferro-electric capacitors are used to tune the resonant frequencies of several resonators used i...
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JP4034540B2 |
A temperature-compensated crystal oscillator is provided with an IC (integrated circuit) having a power supply terminal, an output terminal, and an automatic frequency control (AFC) voltage input terminal. In the temperature-compensated ...
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JP2008005534A |
To provide a suitable integrated inverted-F ferroelectric antenna.The integrated inverted-F ferroelectric antenna comprises a counterpoise 102, a ceramic block 110, an inverted-F structure radiator 104, a bias voltage feed metal inlaid, ...
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JP4031367B2 |
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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JP4027935B2 |
A control unit and a control method are disclosed. First and a second changing units (316 and 318) change impedances of two or more first and second components within a predetermined first and second ranges, respectively, the first and t...
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JP2007325321A |
To provide an improved apparatus for reducing the leakage effect of a local oscillator in a direct down-conversion receiver. The present invention provides a phase shift filter and a direct down-conversion receiver which compensates a ph...
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JP2007295635A |
To provide an FE (ferroelectric) dielectric-tuned antenna and a method for frequency tuning a wireless communications antenna. The method comprises steps of forming a radiator (106), forming a dielectric with ferroelectric material proxi...
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JP2007531404A |
A periodic signal generator includes a resonant LC tank circuit that generates a periodic reference signal at a first frequency at a differential output thereof. A temperature-responsive frequency compensation module is electrically coup...
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JP3995069B2 |
An improved oscillator circuit 400 having a frequency that is substantially independent of temperature. The improved oscillator circuit is particularly well suited for use in an integrated circuit device to produce a clock signal, such a...
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JP2007528159A |
The present invention concerns a method and apparatus for setting a frequency reference in an integrated receiver decoder (IRD). More specifically, the present invention discloses an electrical circuit arrangement in which the voltage co...
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JP2007243586A |
To provide an inexpensive clock correcting circuit to be applied to a specified low power radio system, and also to provide a mobile body terminal, a base station device, and a clock correcting method. As shown in Fig.4, the clock correc...
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JP3973910B2 |
A method of manufacturing a temperature compensated oscillator comprises the steps of: assembling an oscillator in which an IC chip (16) constituting a temperature compensation circuit (30,30') with an oscillation circuit (20) and a comp...
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JP3974679B2 |
A receiver has a crystal oscillator (10) whose frequency can be adjusted in response to temperature compensation (TC) and automatic frequency control (afc) signals. The TC and afc signals are summed and applied to an op-amp (70) having a...
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JP3972091B2 |
The present invention is directed to reduce fluctuations in modulation frequency of a VCO caused by a temperature change in a semiconductor integrated circuit for use in a radio communication system of a frequency hopping method performi...
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JP2007524303A |
Method for stabilizing the frequency of a MEMS (Micro Electro Mechanical Systems) reference oscillator, and a MEMS reference oscillator, wherein the method comprises following steps: using two or more MEMS components, wherein each MEMS c...
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JP3963492B2 |
PURPOSE: To provide an improved method and device for reducing power consumption in an integrated circuit device. CONSTITUTION: A clock rate for a device is controlled by using an integrated circuit responding to a device temperature. Th...
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JP3963282B2 |
To operate in different feeding voltages with one PLL by detecting the value of power supply voltage to a PLL circuit and adjusting an operation frequency of the PLL circuit based on a detection value. A detector detects the value of pow...
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JP3963421B2 |
To solve the problem that an exact system parameter is maintained while a comparatively inexpensive oscillator is required. A controlled oscillator generates a cyclic output signal having first and second output level states. The oscilla...
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JP3950654B2 |
To provide a pseudo cubic function generating circuit with a simple circuit structure with which a large change in voltage can be directly obtained, less noise components are generated, cost is low, and a cubic function curve can be easi...
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JP2007515083A |
A method to control a frequency oscillator, as a crystal oscillator, and to form an oscillating circuit in order to produce a frequency oscillator improved to its qualities, in which the frequency of reference oscillator ( 1 ) is changed...
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JP3921362B2 |
To provide a temperature compensation crystal oscillator that can maintain a phase noise characteristic in good condition. In the temperature compensation crystal oscillator where a voltage variable capacitive element is inserted to an o...
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JP3917177B2 |
A frequency stable oscillating device includes an oscillating transistor. A heating element is disposed in close proximity to the oscillating transistor. A temperature sensor is mounted in close proximity to the oscillating transistor. A...
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JP2007124394A |
To provide an oscillator capable of obtaining a more stable oscillation frequency by reducing influence due to the variation of an element characteristic, and the fluctuation in temperature or power source voltage.The oscillator comprise...
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JP3901693B2 |
To provide an oscillation circuit and method for controlling the oscillation circuit capable of ensuring a required oscillation frequency band, even when the variable width of the oscillated frequency from the oscillation circuit driven ...
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JP2007505543A |
The electromechanical transducer (1) has a resonator element (20) and an actuator (30) for inducing an elastic deformation of the resonator element (20) dependent on the electrical input signal. For temperature stabilization, the electro...
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JP3883411B2 |
To embody an oscillation circuit which can have its oscillation fre quency easily controlled, correct temperature characteristics of an oscillator, and generates an oscillation signal with a high temperature characteristic although a SAW...
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JP2007036556A |
To suppress the consumed electric energy of a high accuracy reference oscillator such as an atomic oscillator and a constant temperature oven controlled crystal oscillator.Upper frames 71, lower frames 72, side face upper frames 73, and ...
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JP2007036555A |
To suppress the consumed electric energy of a high accuracy reference oscillator such as an atomic oscillator and a constant temperature oven controlled crystal oscillator.Upper frames 71, lower frames 72, side face upper frames 73, and ...
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JP2007013878A |
To provide a synchronous oscillation apparatus and synchronous oscillation method in which a reference oscillation frequency is allowed to have accuracy, equal with or higher than a fixed level compensating for aging, without using a hig...
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JP2007500479A |
The time base architecture has first and second oscillators (OSC1,OSC2) oscillating at different frequencies. A difference signal is generated. There is a frequency derivative unit (CTRL) comparing the signal from the first oscillator wi...
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JP2006344983A |
To provide an oscillation frequency stabilizer of an oscillation transistor.A frequency stabilizing oscillator 120 includes an oscillation transistor 22. A heating element is placed near the oscillation transistor 22. A temperature senso...
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JP2006320026A |
To provide an enhanced tunable f-e filter capable of providing a tunable range higher than a desired frequency domain through low I.L. and out-of-high-band rejection, and a method of designing said filter.The present invention quantifies...
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JP3833472B2 |
The invention relates to a method for temperature compensation in an electric circuit. In order to get rid of costly manufacturing processes and external components, a PTAT resistor is replaced by a series connection of two resistive ele...
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