Seiko Epson Corporation

Toshikazu Kuwano

Shuji Kawaguchi

Sachiyuki Abe

Hiroyuki Umeda

Takahiro Kikuchi

Atsushi Yamada

Satoshi Kubota

Hisao Sato

Norikazu Tsukahara

Nobuyuki Oikawa

Yasuhiro Takahashi

An oscillation circuit has a charge-discharge type oscillation unit that performs an oscillation operation at an oscillating frequency that is in accordance with a control current value, and a control current generation unit that generates the control current. The control current generation unit includes a reference voltage generation circuit that generates a reference voltage that has a first temperature characteristic, a temperature characteristic slope correction circuit that corrects a slope of a temperature characteristic of a reference voltage in accordance with first correction information and generates an output voltage that has a second temperature characteristic, and a voltage-current conversion circuit that converts the output voltage of the temperature characteristic slope correction circuit into the control voltage, and that corrects the control current value in accordance with second correction information.

Oscillation circuit, microcomputer and electronic device

The present overcurrent detection circuit includes: a comparative voltage generation unit that generates a comparative voltage that changes in accordance with a power supply voltage; and a comparison unit that generates a comparison result signal by comparing a drain-source voltage of a switching transistor with the comparative voltage.

Overcurrent detection circuit, semiconductor apparatus, and power supply apparatus

Provided is a power supply voltage detection circuit that prevents offsetting from occurring due to different voltages being applied for an extended period of time to gates of two transistors that constitute a differential pair in a comparator circuit that compares a comparison voltage that is generated based on a power supply voltage to a reference voltage. This power supply voltage detection circuit has a reference voltage generation circuit, a comparison voltage generation circuit, and a comparator circuit that includes a first transistor and a second transistor that constitute a differential pair and each have a gate to which a same bias voltage is applied, and a third transistor and a fourth transistor that are respectively connected in series to the first and second transistors and have sources to which the reference voltage and the comparison voltage are respectively applied.

Power supply voltage detection circuit, semiconductor apparatus and electronic device

Provided is a variable resistance circuit in which the resistance value of the variable resistance circuit can be accurately adjusted, by reducing the error in the change amount of the resistance value of the variable resistance circuit due to the on-resistances of switch circuits even if the switch circuits that each bypass a resistor included in a ladder resistor circuit are switched between an OFF state and an ON state. This variable resistance circuit includes: a ladder resistor circuit including a plurality of resistors; a first switch circuit connected in series to one end of one resistor of the plurality of resistors; and a second switch circuit connected in parallel to a series circuit of the one resistor and the first switch circuit. When one of the first and second switch circuits is turned on, the other of the first and second switch circuits is turned off.

Variable resistance circuit, oscillator circuit, and semiconductor device

A semiconductor apparatus includes: a switch circuit connected between a first power supply terminal and an output terminal; a switching element connected between the output terminal and a second power supply terminal; and a control circuit that, when a predetermined period has elapsed since the entry of the switch circuit into an ON state in response to an enable signal, causes the switching element to start a switching operation to increase a power supply voltage supplied between the first power supply terminal and the second power supply terminal.

Semiconductor apparatus, power supply apparatus, electronic device, and control method for power supply apparatus

A circuit device includes an amplifier circuit to which a signal from a sensor is input and a control circuit which controls the sensor and the amplifier circuit. An intermittent operation of the sensor and an intermittent operation of the amplifier circuit are controlled by an intermittent operation control signal output from the control circuit.

Circuit device, integrated circuit and detection device

Detection of the rotation angle of a magnetic field using a magnetic sensor in which two sensor units are arranged at a predetermined angle with respect to each other is performed with a resolution of an angle smaller than 45&#xb0; with a simple circuit configuration. A detection circuit is connectable to a magnetic sensor in which first and second sensor units are arranged at a predetermined angle with respect to each other, each sensor unit having a bridge circuit of magnetoresistance elements. The detection circuit includes a first comparison circuit that compares output signals of the first or second sensor unit, a second comparison circuit that compares an output signal of the first sensor unit with an output signal of second sensor unit, and a rotation angle calculation circuit that calculates a rotation angle of a magnetic field based on the comparison results of the first and second comparison circuits.

Detection circuit, semiconductor integrated circuit device, magnetic field rotation angle detection device, and electronic device

A circuit device includes: a power supply circuit; and a logic circuit, the power supply circuit supplying a first power supply voltage and a second power supply voltage to the logic circuit, the first power supply voltage supplied by the power supply circuit periodically changing with a first reference voltage as a reference voltage, the second power supply voltage supplied by the power supply circuit periodically changing with a second reference voltage as a reference voltage, the power supply circuit supplying, due to resonance, the first power supply voltage and the second power supply voltage that repeat a first period during which a voltage difference between the first power supply voltage and the second power supply voltage is decreasing and a second period during which the voltage difference is increasing, and the logic circuit performing adiabatic circuit operation with the supply of the first and the second power supply voltage.

Circuit device, electronic apparatus, and power supply method

A DC/DC converter and a series regulator are connected in parallel between an input terminal and an output terminal. At the time of a heavy load, the DC/DC converter is operated. Although the DC/DC converter has a large current consumption of its own, it has a high power conversion efficiency. Accordingly, since a load current increases at the time of a heavy load, it is effective to use the DC/DC converter whose power conversion efficiency is high, and its current consumption can be neglected since the load current is large. On the other hand, at the time of a light load, the series regulator is operated. Although the series regulator has a small current consumption of its own, it has a low power conversion efficiency. Accordingly, at the time of a light load, even when the series regulator is used, its low power conversion efficiency can be neglected because its current consumption is small. Accordingly, the current consumption of its own can be lowered at the time of a light load, and the power conversion efficiency as a whole can be improved when it is used both at a heavy load and a light load.

Adjustable current consumption power supply apparatus

Power supply apparatus

A programmable nonvolatile memory apparatus having a simplified circuit structure that eliminates a built-in sequencer circuit using a register ( ) as a source of generating control signals required for writing data in and erasing data from an EEPROM ( ). The register ( ) is provided from outside a microcomputer ( ) with a register address value inputted through an address bus ( ), and a data value inputted through a register bus ( ), and also register control signals, such as, a register write signal ( ), a register read signal ( ) and a register reset signal ( ). The register ( ) includes flip-flops. From the flip-flops, address data and rewriting data are outputted through buses ( ), and in addition, PRPM control signals ( to and ) are also outputted. The address space of the register ( ) and the address space of the EEPROM ( ) are separated from each other.

Growing community of inventors

Fujimi-machi, Japan

Toshikazu Kuwano