Patent application number | Description | Published |
20080258779 | SEMICONDUCTOR INTEGRATED CIRCUIT - A semiconductor integrated circuit, has a current source having one end connected to a power supply and outputting a reference current; a first MOS transistor having one end connected to an other end of the current source and being diode-connected; a second MOS transistor having a gate connected to a gate of the first MOS transistor and passing an output current obtained by current-mirroring the reference current; a first variable resistor connected between an other end of the first MOS transistor and a ground; a resistive component connected between an other end of the second MOS transistor and the ground; and a first operational amplifier fed with a first potential of the other end of the first MOS transistor and a second potential of the other end of the second MOS transistor and outputting a signal for controlling a resistance value of the first variable resistor to equalize the first potential and the second potential, wherein the resistance value of the first variable resistor is controlled based on the output signal of the first operational amplifier. | 10-23-2008 |
20080303603 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - A semiconductor integrated circuit device includes a voltage controlled oscillator which controls a bias current or an oscillation frequency to supply an output signal, a phase-locked loop circuit which supplies a frequency control signal based on the output signal supplied from the voltage controlled oscillator, a peak detection circuit which detects a peak of the frequency control signal supplied from the phase-locked loop circuit, and a bias control circuit which produces a bias current based on the peak detected by the peak detection circuit to supply the bias current. The voltage controlled oscillator controls the bias current supplied from the bias control circuit or the oscillation frequency to supply the output signal based on the frequency control signal supplied from the phase-locked loop circuit. | 12-11-2008 |
20090253396 | WIRELESS COMMUNICATION APPARATUS - A wireless communication apparatus includes a local oscillator that generates a plurality of LO (Local Oschillation) signals corresponding to frequencies of a plurality of input RF (Radio Frequency) signals, an accumulator that accumulates the plurality of LO signals generated by the local oscillator to generate an accumulated signal, a mixer that mixes the plurality of RF signals and the accumulated signal generated by the accumulator and to generate a plurality of base band signals, and a first signal processing unit that executes a signal process with respect to the plurality of base band signals generated by the mixer. | 10-08-2009 |
20110235689 | POWER AMPLIFIER AND SEMICONDUCTOR INTEGRATED CIRCUIT - In general, according to one embodiment, a power amplifier includes an envelope detector, a limiter, and a combiner. The envelope detector is configured to sense an envelope component of an input signal. The limiter includes a PMOS (Positive channel Metal Oxide Semiconductor) transistor and an NMOS (Negative channel Metal Oxide Semiconductor) transistor. The PMOS transistor is configured to sense a phase component of the input signal. The phase component has a second-order distortion controlled within a predetermined range with respect to the input signal. The NMOS transistor is configured to sense a phase component of the input signal. The phase component has the same second-order distortion as the phase component sensed by the PMOS transistor. The combiner is configured to combine the envelope component sensed by the envelope detector and the phase component sensed by the limiter to generate an output signal. | 09-29-2011 |
20120056606 | DC-DC CONVERTER AND SEMICONDUCTOR CHIP - A DC-DC converter includes: a first inductor connected between the second end of the first MOS transistor and the output terminal; a second inductor connected between the second end of the third MOS transistor and the output terminal; a first capacitor connected between a gate of the second MOS transistor and the second end of the third MOS transistor; a second capacitor connected between a gate of the fourth MOS transistor and the second end of the first MOS transistor; and a third capacitor connected at a first end thereof to the second end of the first MOS transistor and connected at a second end to the second end of the third MOS transistor. The DC-DC converter includes: a first resistor connected at a first end to the gate of the second MOS transistor; a second resistor connected at a first end thereof to the gate of the fourth MOS transistor; and a first bias adjustment circuit which compares the output voltage with a preset first reference voltage and which applies a first bias voltage to a second end of the first resistor and a second end of the second resistor to make the output voltage equal to the first reference voltage. | 03-08-2012 |
20120142287 | OSCILLATOR CIRCUIT, RADIO COMMUNICATION DEVICE AND SEMICONDUCTOR INTEGRATED CIRCUIT - According to one embodiment, an oscillator circuit includes a first comparator circuit, a second comparator circuit, a first voltage control circuit, a second voltage control circuit, a clock generation circuit. The first comparator circuit is configured to compare a first voltage with a first threshold voltage to generate a first comparison result. The second comparator circuit is configured to compare a second voltage with a second threshold voltage to generate a second comparison result. The first voltage control circuit is configured to decrease the first voltage by a first voltage value in synchronization with timing when the first comparison result changes. The second voltage control circuit is configured to decrease the second voltage by a second voltage value in synchronization with timing when the second comparison result changes. | 06-07-2012 |
20120142292 | WIRELESS COMMUNICATION APPARATUS - A wireless communication apparatus includes a local oscillator that generates a plurality of LO (Local Oschillation) signals corresponding to frequencies of a plurality of input RF (Radio Frequency) signals, an accumulator that accumulates the plurality of LO signals generated by the local oscillator to generate an accumulated signal, a mixer that mixes the plurality of RF signals and the accumulated signal generated by the accumulator and to generate a plurality of base band signals, and a first signal processing unit that executes a signal process with respect to the plurality of base band signals generated by the mixer. | 06-07-2012 |
20130252559 | DA CONVERTER AND WIRELESS COMMUNICATION APPARATUS - In general, according to one embodiment, a DA converter configured to convert a digital signal comprising n (n>1) bits to an analog current to output the analog current from an output terminal, includes n voltage-current converters. Each of them corresponds to each bit of the digital signal and is configured to generate a current depending on the corresponding bit. A k-th (k is an integer of 0 to n−1) voltage-current converter includes a first transistor whose threshold voltage is adjustable. The first transistor includes a semiconductor substrate, a first diffusion region, a second diffusion region, an insulating film, a charge accumulating film, and a gate. | 09-26-2013 |
20140285266 | AMPLIFICATION DEVICE AND TRANSMITTER - According to one embodiment, an amplification device includes an input terminal into which an input signal is inputted, a first amplifier, an output terminal, a variable impedance module connected at an output end of the first amplifier, a second amplifier, a reference impedance element connected at an output end of the second amplifier, a magnitude comparator, a phase comparator, and a controller. The controller is configured to control impedance of the variable impedance module so that impedance at a point between the first amplifier and the variable impedance approaches a first value. | 09-25-2014 |
Patent application number | Description | Published |
20130057246 | REFERENCE SIGNAL GENERATING CIRCUIT - According to one embodiment, a reference signal generating circuit includes a first nonlinear element that generates a first reference voltage, a second nonlinear element that generates a second reference voltage, a current controlling circuit that controls a current flowing to the first nonlinear element and a current flowing to the second nonlinear element based on an output voltage of the current controlling circuit itself, and N temperature characteristic adjusting elements (N is an integer of 2 or larger) that individually adjust the temperature characteristics of the output voltage of the current controlling circuit. | 03-07-2013 |
20130256660 | SEMICONDUCTOR DEVICE - A semiconductor device according to an embodiment has: a semiconductor substrate; an acoustic resonator formed on the semiconductor substrate, having a semiconductor layer including impurity electrically isolated from the substrate by depletion layer and configured to resonate at a predetermined resonance frequency based on acoustic standing wave excited in the semiconductor layer; a temperature detector formed on the semiconductor substrate and configured to detect temperature of the semiconductor substrate; a calculating unit formed on the semiconductor substrate and configured to perform calculation of temperature compensation based on the temperature detected by the temperature detector, kind of the impurity and concentration of the impurity; and a controller formed on the semiconductor substrate and configured to control the resonance frequency based on a result of the calculation by the calculating unit. | 10-03-2013 |
20130335148 | OSCILLATION FREQUENCY ADJUSTING CIRCUIT - According to one embodiment, a first oscillator has an oscillation frequency that is changed depending on a temperature. A second oscillator has different temperature characteristics from the first oscillator. An on-chip heater heats the first oscillator and the second oscillator. A counter counts a first oscillation signal of the first oscillator. An ADPLL generates a third oscillation signal on the basis of a second oscillation signal of the second oscillator and corrects the frequency of the third oscillation signal on the basis of a count value of the counter. | 12-19-2013 |
20140055189 | MIXER CIRCUIT, SEMICONDUCTOR DEVICE, RECEIVING CIRCUIT, RECEIVING DEVICE, AND COMMUNICATION DEVICE - According to an embodiment, a mixer circuit includes first transistors each having a charge storage layer, a second transistor, a group of first nodes, and an output node. The first transistors as a pair receive a differential signal having a first frequency. The second transistor receives a signal having a second frequency. The group of first nodes makes the charge storage layer of at least any one of the first transistors store charge during non-operation period during which the differential signal having the first frequency and the signal having the second frequency are not mixed and reduces loss of the charge during operation period during which those signals are mixed, to adjust a threshold voltage of at least any one of the first transistors from outside. The output node outputs a signal resulting from mixing the differential signal having the first frequency and the signal having the second frequency. | 02-27-2014 |
Patent application number | Description | Published |
20080228109 | GUIDE WIRE - A guide wire includes a member with a core wire. The guide wire may have a marker-forming layer which partly encircles the outer surface of the member and differs in color from the member, and a coating layer which covers the marker-forming layer and the member at least in the region where the marker-forming layer is formed and has such transparency as to make the marker-forming layer visible. The marker-forming layer and the coating layer can be formed from mutually miscible resins, while the marker-forming layer functions as a visible marker. | 09-18-2008 |
20080242933 | ENDOSCOPIC TREATMENT TOOL AND SUTURING METHOD USING THE SAME - An endoscopic treatment tool according to the present invention is an endoscopic treatment tool which is inserted into hollow organs via the mouth, nose, anus, or other natural orifice of the patient and performs suturing treatment within the hollow organs or abdominal cavities, includes: a hollow organ lining support which is smaller than the smallest diameter of a passage from a natural orifice of the hollow organ, the hollow organ lining support being able to expand so as to have a diameter larger than the smallest diameter of the passage from the natural orifice of the hollow organ. | 10-02-2008 |
20080281230 | Guide Wire - A guide wire includes a wire body having a core wire and a resin coating layer covering an outer periphery of a distal section of the wire body, and an annular member provided on the proximal side of the resin coating layer. The outer diameter of the distal end of the annular member and the outer diameter of the proximal end of the resin coating layer are preferably equal, and a distal end face of the annular member is joined to a proximal end face of the resin coating layer. | 11-13-2008 |