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JP3019340B2 |
A capacitor array provides a variable capacitance, having FET's as respective switching elements (10, 11, 12) for switching each capacitor (20, 21, 22) in the array on and off, and means (8) for controlling switching of the switching ele...
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JP2000036739A |
To allow an oscillator which adjusts the control voltage of a voltage- controlled oscillation circuit according to a temperature detected value which is obtained by a temperature sensor to control the oscillation circuit to a constant os...
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JP2000031815A |
To provide a frequency controller capable of detecting and correcting the frequency change of a voltage controlled type temperature compensated crystal oscillator (VC-TCXO) with time. This method is provided with a temperature detecting ...
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JP3001934B2 |
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JP2000013254A |
To obtain the radio device which is free from degradation in transmission characteristics by detecting variation in the forward gain in a loop and performing control so that the forward gain becomes constant. Part of the output of a powe...
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JPH11355192A |
To set the gain of an amplifier to be almost constant by means of a frequency setting signal and a temperature difference by transmitting the frequency setting signal from an indoor unit to an outdoor unit with a cable and controlling a ...
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JP2993218B2 |
PURPOSE: To obtain the oscillator with stable frequency and output level by providing a frequency compensation conversion circuit and a gain compensation control circuit against a temperature change in a voltage controlled oscillator pro...
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JP2980318B1 |
[wrap up] [Task] An object of the present invention is to provide a warm-up circuit that warms up in a short time equivalent to restart when the power supply of the device is temporarily interrupted. In the warm-up circuit that controls ...
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JPH11308050A |
To obtain a voltage-controlled oscillator with a good temperature characteristic even in high frequency regions by constituting an extension coil by series connection of plural coils. A feedback resistor R is connected in parallel with t...
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JP2969530B2 |
A digital temperture compensation oscillator for digitally compensating a variation in oscillation frequency due to temperatures, by applying a compensation voltage to a voltage controlled oscillator, comprises temperature detection mean...
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JPH11298299A |
To provide a buffer oscillator with which a stable clock frequency can be maintained independently of a temperature. A precise relaxation oscillator 1 having temperature compensation generates the stable clock frequency over the wide flu...
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JPH11284435A |
To provide an oscillator low in cost, high in reliability and capable of executing highly precise oscillation, while a temperature characteristic capable of being can easily be set. In this oscillator, the temperature measured by a therm...
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JP2956781B2 |
An emitter-coupled multivibrator circuit independent of temperature and supply voltage includes an oscillator circuit (11), a current control circuit (12) and a supply voltage circuit (13) for producing at least one reference voltage. Th...
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JP2954662B2 |
A temperature-compensated distance sensor contains a detector coil constructed in the form of divided wires insulated from one another. A first set of wires (L) constitutes the oscillating coil connected in parallel with a capacitor and ...
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JPH11234246A |
To provide a high-reliability wavelength multiplex optical transmission system. This optical transmission system is formed by providing plural optical transmitters 1 and an optical transmission line for the multiplex transmission of beam...
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JPH11231951A |
To maintain the level of internal power supply voltage on a fixed level even when there is change in a circuit manufacturing process by compensating voltage fluctuation due to the change in the circuit manufacturing process when an inter...
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JPH11220327A |
To stabilize the output frequency in an operating temperature range. The operating temperature range of a temperature compensating crystal oscillator 10 is divided into low, medium and high temperature areas. A compensation circuit 14 ha...
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JPH11214212A |
To reduce the insertion loss and obtain excellent temperature stability in frequency, by constituting the ratio of saturation magnetization of a permanent magnet and that of microwave ferrite to be greater than the ratio at the time of n...
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JP2927300B2 |
A temperature controlled crystal oscillator circuit comprising an amplifier (12) having a feedback path including a crystal (26) and a frequency pulling element (28), and a temperature compensating voltage generating means (30) coupled t...
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JPH11508744A |
PCT No. PCT/EP96/02823 Sec. 371 Date Jun. 11, 1998 Sec. 102(e) Date Jun. 11, 1998 PCT Filed Jun. 27, 1996 PCT Pub. No. WO97/02657 PCT Pub. Date Jan. 23, 1997There is described a stabilization process for the local oscillator frequency in...
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JP2924803B2 |
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JP2923910B2 |
The use of a control circuit (160) with either a programmable divider or divider(s) (190) and multiplexer (200) guarantees that, irrespective of the process variations, a voltage controlled oscillator has a low gain Vin-Fout characterist...
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JP2924162B2 |
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JP2921435B2 |
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JPH11163719A |
To provide the temperature compensation device, the radio communication equipment and the printed circuit board where increase in the component cost and power consumption are suppressed. Since a resistance of a thermister 3 changes with ...
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JP2901357B2 |
There are provided a memory for storing data for calculation of approximate temperature compensation data for the address data outside the temperature compensation range; a discriminator for discriminating whether the address data corres...
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JP2903126B2 |
The invention relates to an oscillator circuit comprising an oscillator (OSC) with a CMOS gate. A suitably proportioned CMOS gate consumes power only when its gate output, assumed to be capacitively loaded, is charged. Using this fact, a...
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JP2880376B2 |
A receiver which has a linear approximation expression showing a relationship between the frequency deviations and corresponding changes to the voltage which is to be supplied to the voltage controlled reference oscillator to adjust the ...
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JPH1155109A |
To provide a current source circuit with which the temperature fluctuations of a current for regulating the center frequency of a voltage controlled oscillator(VCO) is compensated against with respect to the change in a surrounding tempe...
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JP2860177B2 |
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JPH1144784A |
To miniaturize a device, and to improve the accuracy by always counting time on the basis of the clock signal from a pair of crystal oscillation parts, and while performing various processing, and correcting the time counting information...
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JPH1141092A |
To reduce power line noise by lowering the voltage between a ground point and a neutral reference point by positioning the neutral reference point at a distance from the ground point and exciting the ground point according to the neutral...
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JPH1127178A |
To suppress a communication error resulting from a frequency change attended with a temperature change by compensating temperature of the digital temperature compensation piezoelectric oscillator at a time just before a reception standby...
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JPH1116467A |
To give high oscillating performance with high reliability to an oscillator with low oscillating performance such as a CERALOCK(R) to reduce the cost by measuring the error of pulse signals with an outside calibrating apparatus for input...
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JPH117483A |
To obtain a signal component which eliminates the variation of circuit elements included in a signal and a DC fluctuation component that is caused by secular change, etc., by filtering a step-wise differential voltage amplification outpu...
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JP2840472B2 |
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JPH10325887A |
To easily achieve a logic emergency circuit for adjusting the amount of emergency for the secondary temperature characteristics of a crystal in a semiconductor process. An oscillation means 1 with a vibrator such as a crystal as an origi...
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JP2830424B2 |
PURPOSE:To eliminate the fluctuation of the driving capability of an oscillation inverter that is caused when the driving voltage is switched via a program by using plural oscillation inverters having the characteristics corresponding to...
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JPH10294618A |
To prevent sudden change in the temperature of a crystal oscillator by providing an insulating block with satisfactory heat conduction which is supported by penetrating two lead members protruding outwardly from a metallic base and a hea...
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JPH10290157A |
To provide the method and device for compensating a temperature where component and manufacture management to match ranking of the temperature characteristic of a crystal oscillator is not required and temperature is surely compensated. ...
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JP2814638B2 |
There is provided a system for automatically and integrally calibrating an oscillator 10 to achieve frequency accuracy and stability in a radio, particularly a radio where the temperature of an oscillator can be set. For calibration or s...
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JPH10510973A |
A function-differentiated temperature compensated crystal oscillator (10) is disclosed having an integrated circuit (12), at least one capacitor (14) and a piezoelectric element (16) being electrically coupled to a leadframe (18), and be...
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JPH10271001A |
To provide an oscillation controller in which C/N of a voltage controlled oscillator means is improved to correct a characteristic change due to manufacture tolerance and temperature, thereby attaining an oscillation operation suitable f...
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JPH10271002A |
To provide an oscillation controller in which C/N of a voltage controlled oscillator means is improved to correct a characteristic change due to manufacture tolerance and temperature, thereby attaining an oscillation operation suitable f...
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JP2808603B2 |
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JP2785831B2 |
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JP2771471B2 |
In a radio pager capable of receiving a paging signal subjected to multilevel digital frequency modulation, an analog-to-digital converter (ADC) receives a demodulated voltage signal in the form of an analog signal from a demodulator. Th...
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JP2768645B2 |
PURPOSE: To omit a voltage controlled delay unit and a feedback loop that is needed for the control of the delay unit. CONSTITUTION: When the oscillation output of a VCO 10 is supplied to the high frequency multipliers 14-1 and 14-2, the...
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JP2766103B2 |
PURPOSE: To make the oscillation of the phase locked loop stable. CONSTITUTION: An oscillation control MOS transistor(TR) 12 is connected to ground side of a CMOS TR 11 being a component of a voltage controlled oscillator 10 and a compen...
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JPH10145139A |
To enhance the operation stability in a crystal oscillator and its adjustment method. A control circuit is composed of a temperature sensor 30, a temperature-sensing section 32, a memory 36, an amplifier section 31 to which the memory 36...
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