Patent application number | Description | Published |
20090167367 | Frequency Synthesizer - An object of the present invention provides a frequency synthesizer having a broad frequency entraining range which can finely set a frequency over a broad band by a novel principle. | 07-02-2009 |
20110001523 | FREQUENCY SYNTHESIZER - Provided is a frequency synthesizer capable of fine setting over a wide band and having a wide frequency pull-in range. A sine wave signal of an output frequency of a voltage controlled oscillating part is quadrature-detected, and in a PLL utilizing a vector rotating at a frequency (velocity) equal to a difference from a frequency of a frequency signal used for the detection, a frequency pull-in means integrates a first constant for increasing the output frequency as a pull-in voltage when a control voltage from the PLL to the voltage controlled oscillating part is larger than a prescribed set range, and integrates a second constant for decreasing the output frequency as the pull-in voltage when the control voltage is smaller than the set range. Then, an adding means adds the control voltage from the PLL and the pull-in voltage from the frequency pull-in means to output an addition result to the voltage controlled oscillating part. | 01-06-2011 |
20110169533 | FREQUENCY SYNTHESIZER - The provision of a technique capable of determining a state where PLL control does not operate normally instantly or in advance in a frequency synthesizer that frequency-divides, A/D converts, and quadranture-detects a frequency signal from a voltage controlled oscillating unit, and extracts a rotation vector rotating at a frequency difference between the frequency signal used for the detection and the A/D converted frequency signal, and integrates a difference between a frequency of the above rotation vector and a set frequency to set an integration result as a control voltage to the voltage controlled oscillating unit. | 07-14-2011 |
20130033332 | QUARTZ-CRYSTAL CONTROLLED OSCILLATOR - An atmosphere temperature at which a quartz-crystal oscillator and an oscillation circuit are placed is controlled in high accuracy, and an output frequency with high stability is obtained. If oscillation outputs of first and second quartz-crystal oscillators are set to f | 02-07-2013 |
20130106523 | OSCILLATOR | 05-02-2013 |
20140003166 | ELECTRONIC EQUIPMENT | 01-02-2014 |
20140085015 | OSCILLATION DEVICE - An oscillation device is provided. The oscillation device includes: a main circuit portion, a heating unit, first and second crystal units, first and second oscillator circuits, a frequency difference detector, a first addition unit, an integration circuit unit, a circuit unit configured to control an electric power to be supplied to the heating unit, a compensation value obtaining unit, and a second addition unit. The compensation value obtaining unit is configured to obtain a frequency compensation value for compensating an output frequency of the main circuit portion based on an integrated value output from the integration circuit unit, and based on a change in the clock signal due to a difference between the temperature of the atmosphere and the temperature setting value of the heating unit. The second addition unit is configured to add the frequency compensation value to a frequency setting value. | 03-27-2014 |
20140292416 | OSCILLATOR - An oscillator configured to obtain a frequency output corresponding to a frequency setting value includes: an oscillation circuit portion that receives the frequency setting value; a setting value output portion that outputs a digital value for designating the frequency setting value; an interpolation circuit portion that performs interpolation for a digital value of lower-order bits out of the digital value output from the setting value output portion; and an adder that adds an output of the interpolation circuit portion and a digital value of higher-order bits out of the digital value output from the setting value output portion, wherein a signal output from the interpolation circuit portion is sequential data having first and second values different from each other, and output counts of the first and second values are determined based on a ratio corresponding to the digital value of the lower-order bits. | 10-02-2014 |
20140297056 | TEMPERATURE CONTROLLER - A temperature controller for controlling a temperature of a heated body heated by a heater to a target temperature. The temperature controller includes a temperature detection unit, a difference computation unit, a controller, a comparison unit, an abnormal event detection unit, and a power feeding stopping unit. The abnormal event detection unit is configured to output a second signal that is an abnormal event detection signal when the first signal continues to be output for a period of time exceeding a pre-set period of time. The power feeding stopping unit is configured to stop power feeding to the heater when the second signal is output. The power feeding amount to the heater is controlled based on the manipulated variable computed by the controller. | 10-02-2014 |