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JP5361228B2 |
A navigation-satellite receiver comprises a real-time clock that can be slaved to the highly accurate time base of the GPS system. During such times, the amount of correction and the operating temperature are both tracked. It is. assumed...
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JP5329082B2 |
A Voltage Controlled Oscillator (VCO) in a battery-powered device, such as a cellular phone, can be configured to tune across a fairly wide frequency range using a relatively narrow control voltage range. The frequency response of the VC...
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JP2013214915A |
To improve the frequency accuracy of an oscillating device (an on-chip oscillator).An oscillating device includes: an oscillation circuit 25 generating a clock signal CKOUT on the basis of a voltage VCNT; a control circuit 26 generating ...
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JP5319790B2 |
To provide a reference frequency generating device that can output a highly accurate reference frequency signal even if a reference signal becomes unable to be acquired. The reference frequency generating device includes a synchronizatio...
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JP5309567B2 |
To provide an atomic oscillator that forms no extremely low temperature part on an internal surface of a gas cell in which a quantum absorber is enclosed and can accelerate stable gasification of the quantum absorber. The atomic oscillat...
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JP5310728B2 |
A synthesizer of the present invention includes: a synthesizer unit that outputs an oscillation signal based on a reference oscillation signal; a temperature detecting unit that detects a temperature; a time variation detecting unit that...
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JP5280449B2 |
An oscillator circuit increases and reduces signal levels of first and second oscillation signals in a complementary manner in response to a transition of a signal level of a reference clock. An oscillation control circuit compares each ...
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JP2013143601A |
To provide an oscillation device capable of outputting a control signal that highly accurately suppresses influence based on temperature characteristics and also simplifying the configuration.An oscillation device includes: a frequency d...
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JP2013093715A |
To provide an electronic apparatus in which, even when the local temperature rise occurs, a correction value by a temperature sensor and frequency drift of a crystal resonator can be followed by each other.An electronic apparatus 1 for c...
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JP2013516836A |
A signal generating circuit and method are disclosed that do not require a phase-locked-loop and a low frequency temperature-stable oscillator. The method may include generating an oscillating output signal responsive to a feedback signa...
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JP5129483B2 |
A compensated microelectromechanical oscillator, having a microelectromechanical resonator that generates an output signal and frequency adjustment circuitry, coupled to the microelectromechanical resonator to receive the output signal o...
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JP5128747B2 |
The frequency error of an oscillator is minimized by characterizing the oscillator. A reference signal from an external source containing a minimal frequency error is provided to an electronic device. The external signal is used as a ref...
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JP5086479B2 |
A MEMS oscillator including: an oscillator unit being capable of outputting an output from an amplifier as an original oscillator signal that includes a feedback type oscillator circuit including a MEMS resonator and an amplifier, and an...
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JP2012227629A |
To prevent the influences of wind which acts on output frequency characteristics of a crystal oscillator.A temperature control device of a crystal oscillator 100 has: a crystal oscillator 100 having at least a constant temperature tank 1...
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JP5074542B2 |
An internal supply voltage generating circuit includes a reference voltage generator for generating a reference voltage and an internal voltage level amplifier for amplifying the reference voltage to generate an internal voltage. The int...
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JP5072115B2 |
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JP5063833B2 |
The proposed high frequency generator comprises first oscillator (51) with crystal (51a) used as a time base supplying frequency (f1), second oscillator (56) supplying a second frequency (f2), a divisor (60) providing a frequency (f3), p...
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JP2012195932A |
To provide an oscillation device capable of obtaining a stable oscillating frequency by compensating a change in the oscillating frequency with the passage of operation time of a quartz resonator.A difference value ΔF between a frequenc...
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JP5027265B2 |
There is provided an art to prevent an unstable operation due to temperature in a PLL apparatus in which a proper range of an amplitude level of an external reference frequency signal is specified and a control voltage is supplied to a v...
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JP5016074B2 |
A PLL circuit is provided capable of reducing phase noise and facilitating design. In the PLL circuit, a PLL receives a reference frequency and an output from a VC-TCXO, performs a lock operation. In a lock state, a selector selects an o...
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JP5011559B2 |
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JP4998275B2 |
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JP4994456B2 |
A representative measurement indicating a relative oscillation speed of a reference clock during a representative calibration period is ascertained. Multiple calibration periods are defined including first and second calibration periods....
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JP4955769B2 |
Techniques for generating reference signals for multiple communication systems are described. An apparatus comprises a reference oscillator, a frequency control unit, and a plurality of frequency synthesizers. The reference oscillator ge...
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JP4942677B2 |
To provide a voltage control apparatus 20 for controlling frequency of signal output from a voltage controlled crystal oscillator (VCXO) in higher accuracy. The voltage control apparatus 20 previously measures two kinds of control voltag...
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JP4944288B2 |
The present invention relates to a system and method for compensating IC parameters. According to an embodiment of the present invention, a die of an IC wafer is coupled with a compensation circuit that classifies the die into various ty...
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JP4939942B2 |
A strained-silicon voltage controlled oscillator (VCO) includes a first p-channel metal oxide semiconductor (PMOS) device having a strained-silicon layer coupled to a second PMOS device having a strained-silicon layer.
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JP2012075042A |
To provide a stabilization method of origination frequency applicable to a wireless device installed in an environment where temperature variation is extremely large from ultrahigh temperature to ultralow temperature.The stabilization me...
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JP2012060583A |
To provide a compact and inexpensive clock generator capable of outputting a highly accurate clock signal over a wide temperature range.A clock generator includes a reference clock generating part 11 which generates a reference clock sig...
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JP4883031B2 |
A synthesizer includes a synthesizer unit for generating a local oscillation signal based on a reference oscillation signal output from a reference oscillation unit including a MEMS resonator, a frequency fluctuation detector for detecti...
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JP4880014B2 |
A frequency synthesizer in which a satisfactory frequency stability can be obtained over the entire long period of service immediately after power activation is disclosed. The reference signal generation circuit includes an OCXO, a TCXO,...
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JP4850959B2 |
A PLL circuit which can obtain a VCO output having satisfactory spurious output characteristics with respect to all channels and which can suppress the fluctuation of the characteristics due to a temperature change is disclosed. A contro...
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JP4835596B2 |
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JP2011244359A |
To provide a frequency synthesizer in which high responsiveness is maintained and which can be stably adapted to variation or diffusion in respective sections in spite of simplified hardware configuration.A frequency synthesizer has a va...
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JP4824801B2 |
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JP4821784B2 |
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JP4812765B2 |
A method and device bracket are presented for reconfigurable radiation desensitivity. The method includes: accepting a radiated wave from a source such as a transmitter, antenna, microprocessor, electrical component, integrated circuit, ...
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JP4787114B2 |
A real-time clock apparatus, a semiconductor device realizing the real-time clock apparatus, and an electrical apparatus using the real-time clock apparatus are disclosed. The real-time clock apparatus includes a crystal oscillation circ...
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JP2011160081A |
To provide a method for generating adjustment data of a temperature characteristic which can reduce the influence of an n-th temperature coefficient and suppress an increase in cost when adjusting the (n-1)-th temperature coefficient of ...
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JP4713556B2 |
Device and method for temperature compensation in a clock oscillator using quartz crystals, which integrates dual crystal oscillators. The minimal power consumption is achieved through an efficient use of a processor in charge of the syn...
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JP2011124838A |
To perform delay time control at high speed, and to improve performance.A temperature sensor S1 detects a temperature to be outputted as temperature information. A TAP holding circuit S2 locks a DLL circuit S4 within a use temperature ra...
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JP2011518535A |
Techniques for compensating for the effects of temperature change on voltage controlled oscillator (VCO) frequency are disclosed. In an embodiment, an auxiliary varactor is coupled to an LC tank of the VCO. The auxiliary varactor has a c...
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JP4695110B2 |
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JP4691024B2 |
A first phase-locked loop (PLL) circuit (301) includes an input for receiving a timing reference signal from an oscillator 303, a controllable oscillator circuit (805) supplying an oscillator output signal, and a multi-modulus feedback d...
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JP4683153B2 |
A synthesizer including an oscillator for outputting an oscillation signal based on an output signal from a comparator, a frequency divider for dividing a frequency of an output signal from the oscillator based on control from a controll...
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JP4680600B2 |
A radar-based distance measurement apparatus comprises a microwave circuit comprising a frequency generator which produces a microwave frequency signal, the frequency of which is modulated by an amount determined by a modulation signal a...
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JP4665501B2 |
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JP4666564B2 |
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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JP4656103B2 |
Oscillator unit (1) of the present invention is configured such that a frequency adjustment unit of synthesizer (4) used by controller (6) is smaller than a frequency variation tracking capability of demodulator (8) connected to an outpu...
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JP2011049877A |
To make frequency control of a clock signal more properly.A table value TVAL is outputted from a set point storing circuit 13 according to the frequency of a monitor signal MS as a monitor result by a ring oscillator 16 of a monitor circ...
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