Patent application number | Description | Published |
20090066429 | Voltage detection circuit and oscillator using the same - Provided is a voltage detection circuit that outputs a detection result when a voltage to be measured exceeds a predetermined voltage or falls below the predetermined voltage at a speed higher than that of a conventional case. The voltage detection circuit according to the present invention includes an input buffer that outputs a detection voltage to be input as an input voltage, and a voltage detection section that accelerates a rising of the input voltage in a transient state where the input voltage exceeds a predetermined threshold value, and accelerates a dropping of the input voltage in a transient state where the input voltage falls below the predetermined threshold value. The voltage detection circuit accelerates a change in the input voltage to output the detection result from an output buffer at high speed. | 03-12-2009 |
20100156507 | Temperature detection circuit - Provided is a temperature detection circuit capable of preventing malfunction, which may occur when power is turned on. A switch circuit for giving such a potential that a comparator detects a low temperature is provided at an output terminal of a temperature sensor circuit. A switch circuit for giving such a potential that the comparator detects a low temperature is provided at an output terminal of a reference voltage circuit. When the power is turned on, each of the switch circuits is set by a switch control circuit such that the comparator detects a low temperature. | 06-24-2010 |
20100176839 | POWER SUPPLY VOLTAGE MONITORING CIRCUIT AND ELECTRONIC CIRCUIT INCLUDING THE POWER SUPPLY VOLTAGE MONITORING CIRCUIT - Provided is a power supply voltage monitoring circuit ( | 07-15-2010 |
20100176854 | DELAY CIRCUIT - Provided is a delay circuit that has a delay time period independent of a power supply voltage and has the equal delay time period between a case of a change in input signal from Low to High and a case of a change in input signal from High to Low. The delay time period is determined as a time period necessary for a voltage of a capacitor ( | 07-15-2010 |
20100176874 | VOLTAGE DETECTION CIRCUIT - Provided is a voltage detection circuit having a small circuit scale. A P-type metal oxide semiconductor (PMOS) transistor ( | 07-15-2010 |
20100180059 | DETECTION CIRCUIT AND SENSOR DEVICE - Provided is a detection circuit for monitoring a power supply voltage with a circuit configuration in which power consumption is reduced, and a sensor device including the detection circuit. A detection circuit ( | 07-15-2010 |
20100321845 | OVERHEAT PROTECTION CIRCUIT AND POWER SUPPLY INTEGRATED CIRCUIT - Provided is a power supply integrated circuit including an overheat protection circuit with high detection accuracy. The overheat protection circuit includes: a current generation circuit including: a first metal oxide semiconductor (MOS) transistor including a gate terminal and a drain terminal that are connected to each other, the first MOS transistor operating in a weak inversion region; a second MOS transistor including a gate terminal connected to the gate terminal of the first MOS transistor, the second MOS transistor having the same conductivity type as the first MOS transistor and operating in a weak inversion region; and a first resistive element connected to a source terminal of the second MOS transistor; and a comparator for comparing a reference voltage having positive temperature characteristics and a temperature voltage having negative temperature characteristics, which are obtained based on a current generated by the current generation circuit. | 12-23-2010 |
20110169458 | BATTERY PACK - Provided is a battery pack capable of reducing the number of terminals of a battery protection IC. When a battery ( | 07-14-2011 |
20110234309 | INTERNAL POWER SUPPLY VOLTAGE GENERATION CIRCUIT - Provided is an internal power supply voltage generation circuit with which a through current of a logic circuit supplied with an internal power supply voltage does not depend on a power supply voltage. A reference voltage (VREF) is generated based on a constant current of a current source ( | 09-29-2011 |
20120062312 | CONSTANT CURRENT CIRCUIT - This package manufacturing method is a method for manufacturing a package using a rivet having a flat plate-shaped head portion and a core portion protruding from a rear surface of the head portion. The package includes: a plurality of substrates that are bonded to each other: a cavity that houses an object to be housed in an airtightly sealed state; the core portion which is disposed in a through hole that penetrates a base substrate and which electrically connects the object to be housed with the outside; and a glass frit that is filled between the through hole and the core portion and is fired to form a seal between the though hole and the core portion. The package manufacturing method includes: a rivet disposing step of inserting the core portion into the through hole until the rear surface of the head portion comes into contact with a first surface of the base substrate; a glass frit filling step of filling the glass frit in a paste form between the through hole and the core portion; and a firing step of integrally fixing the through hole, the rivet and the glass frit by firing the filled glass frit, and sealing between the through hole and the core portion. A gas relief passage, which leads from a base end of the core portion to a side surface or a front surface of the head portion, is formed on the rear surface of the head portion of the rivet. | 03-15-2012 |
20120105132 | TEMPERATURE DETECTION DEVICE - Provided is a temperature detection device capable of attaining low current consumption at no expense of detection speed at around a temperature to be detected. The temperature detection device includes a control circuit for outputting a control signal for controlling ON/OFF of such internal circuits as a reference voltage circuit and a comparator. In the control circuit, in order to increase the detection speed at around the temperature to be detected, an oscillation frequency of an oscillation circuit has positive temperature characteristics. Further, the control circuit includes a waveform shaping circuit so as to optimize the waveform of the control signal for controlling ON of the internal circuits, to thereby attain low current consumption. | 05-03-2012 |
20120126873 | CONSTANT CURRENT CIRCUIT AND REFERENCE VOLTAGE CIRCUIT - Provided is a constant current circuit and a reference voltage circuit with improved line regulation without needing a start-up circuit. The constant current circuit includes: a constant current generation circuit including NMOS transistors and a resistor; a current mirror circuit including a pair of depletion mode NMOS transistors, for allowing a current of the constant current generation circuit to flow; and a feedback circuit for maintaining constant voltages of source terminals of the pair of depletion mode NMOS transistors. | 05-24-2012 |
20120131402 | TEST MODE SETTING CIRCUIT - Provided is a test mode setting circuit with a smaller number of terminals. A detector having a low threshold voltage and a detector having a high threshold voltage are provided to a test terminal for controlling a test mode of a semiconductor device, and the detector having the low threshold voltage releases a reset of a logic circuit while the detector having the high threshold voltage controls switching of the test mode. This configuration uses the test terminal, a reset terminal, and test mode control terminals in common between a normal state and a test state, thus reducing a large number of the terminals. | 05-24-2012 |
20120182062 | TEMPERATURE SENSOR DEVICE - Provided is a temperature sensor device operable at a lower voltage. The temperature sensor device detects temperature based on an output voltage of a forward voltage generator for generating a forward voltage of a PN junction. The forward voltage generator includes a level shift voltage generation circuit, and an output voltage of the temperature sensor device is given based on the forward voltage of the PN junction and a voltage of the level shift voltage generation circuit. | 07-19-2012 |
20120187911 | OUTPUT CIRCUIT, TEMPERATURE SWITCH IC, AND BATTERY PACK - An output circuit has a smaller area and restrains outputs from becoming unstable even if a power supply voltage is lower than an operating voltage. A supply terminal of an inverter circuit is provided with switch circuit, and the switch circuit stops the operation of the inverter circuit when the power supply voltage is lower than the operating voltage of the circuit. Further, the output terminal of the inverter circuit is provided with a current source to fix the output to the power supply voltage when the operation of the inverter circuit is stopped. | 07-26-2012 |
20120206119 | VOLTAGE REGULATOR - Provided is a voltage regulator having improved overshoot characteristics. In the voltage regulator, a current limiting circuit formed of, for example, a constant current source is provided in series to an output transistor, to thereby limit an output overcurrent. Further, a voltage limiting circuit formed of, for example, a diode is provided to an output terminal, to thereby limit an output voltage. | 08-16-2012 |
20120206172 | INTERNAL POWER SUPPLY VOLTAGE GENERATION CIRCUIT - Provided is an internal power supply voltage generation circuit, with which a through current that flows during the operation of a logic circuit can be prevented from being excessive due to fluctuations in threshold voltage of a P-type transistor and an N-type transistor forming the logic circuit, and current consumption can be suppressed. Provided is an internal power supply voltage generation circuit for generating an internal power supply voltage at an internal power supply terminal and supplying the internal power supply voltage to a logic circuit, the internal power supply voltage generation circuit including a transistor having a source follower configuration for outputting a voltage applied to a gate thereof. A value of the internal power supply voltage is given based on the sum of an absolute value of a threshold voltage of an N-type transistor and an absolute value of a threshold voltage of a P-type transistor. | 08-16-2012 |
20120206193 | INTERNAL POWER SUPPLY VOLTAGE GENERATION CIRCUIT - Provided is an internal power supply voltage generation circuit, with which a through current can be prevented from being excessive due to manufacturing fluctuations during the operation of a logic circuit, to thereby suppress current consumption. Provided is an internal power supply voltage generation circuit for generating an internal power supply voltage at an internal power supply terminal and supplying the internal power supply voltage to a logic circuit, the internal power supply voltage generation circuit including: a transistor having a source follower configuration for outputting a voltage applied to a gate thereof; and a current limiting circuit for limiting a maximum current of the transistor having the source follower configuration for outputting the voltage applied to the gate thereof, to thereby suppress a maximum current supplied to the logic circuit and suppress current consumption. | 08-16-2012 |
20130154604 | REFERENCE CURRENT GENERATION CIRCUIT AND REFERENCE VOLTAGE GENERATION CIRCUIT - Provided are a reference current generation circuit and a reference voltage generation circuit, which have improved response speed when power supply is activated or fluctuates. In order to reduce a load capacitance of an operational amplifier, a transistor for providing a current to a transistor pair having a common gate-source voltage is provided, and the operational amplifier controls an ON-state resistance of the transistor. | 06-20-2013 |
20140084878 | POWER SUPPLY SWITCHING CIRCUIT - Provided is a power supply switching circuit capable of suppressing a load fluctuation such as undershoot that occurs at an output terminal at the time of power supply switching. The power supply switching circuit includes: a battery connected to the output terminal; a replica current generation circuit for generating a replica current that is proportional to a current flowing from the battery to the output terminal; a voltage regulator connected to the output terminal, the voltage regulator including a reference voltage circuit, an error amplifier circuit, an output transistor, and a voltage divider circuit; and a current mirror circuit for causing the replica current to flow through the output transistor of the voltage regulator. | 03-27-2014 |