Lapis Semiconductor Co., Ltd.

Lapis Technology Co., Ltd.

Tetsuo Oomori

Kenji Arai

Kentaro Toda

Kenichiro Nagatomo

Tsuguto Maruko

Manabu Miyazawa

Hirofumi Ogawa

Toru Ueno

Touru Ueno

Shingo Taniguchi

A semiconductor device includes: a first input to which an input signal is input; a second input to which a reference signal is input; and a comparison stage which includes a current source connected to a first potential and first and second current path parts connected between the current source and a second potential different from the first potential and performing a comparison operation in response to the input signal and the reference signal, wherein the first and second current path parts respectively include first and second input circuits which are connected to the current source and first and second load circuits which are connected between the second potential and the first and second input circuits, wherein the first input circuit includes a first signal transistor and a first reference transistor, and wherein the second input circuit includes a second signal transistor and a second reference transistor.

Semiconductor device

A semiconductor device includes first to N-th voltage output circuits each outputting an output voltage and outputs a feedback voltage having a voltage value corresponding to the output voltage, and a differential circuit including first to N-th primary side transistors to which N feedback voltages are input and that individually flow first to N-th currents through a first node, a secondary side transistor that flows a reference current corresponding to a reference voltage through the first node, and a current mirror circuit as an active load. The current mirror circuit includes first to N-th primary side load transistors individually coupled in cascade to the first to N-th primary side transistors, a secondary side load transistor coupled in cascade to the secondary side transistor and generates a voltage at a connection point between the secondary side transistor and the secondary side load transistor as a control voltage.

Semiconductor device and voltage generation method

An oscillator circuit includes an amplifying unit and a first feedback resistor. The amplifying unit includes an inverter at an input stage being connected to the one end of a crystal resonator, an inverter at an output stage being connected to the other end of the crystal resonator, and a linear amplifier. The linear amplifier is connected between an output terminal of the inverter at the input stage and an input terminal of the inverter at the output stage. The linear amplifier includes at least one inverter and a second feedback resistor. The second feedback resistor is connected in parallel to the at least one inverter. The linear amplifier has a conductance with a magnitude larger than a conductance of the inverter at the input stage and equal to or less than a conductance of the inverter at the output stage.

Crystal oscillator circuit

A logic circuit includes an inverter that outputs from an output terminal a signal created by inverting the logic of a signal input into an input terminal, a first transistor that is connected to the input terminal in such a way as to maintain an OFF state, and a second transistor that is connected to the output terminal in such a way as to maintain an OFF state.

Logic circuit

A semiconductor device includes a resistor element connected to one and another end of a crystal oscillator, and an adjustable current type inverter element having an input connected to one end of the resistor element and an output connected to another end of the resistor element. A first capacitor element is connected to the input of the inverter element and to ground, and a second capacitor element has one end connected to ground. A first switching element switches a connection state of the one end of the first capacitor element and another end of the second capacitor element. A third capacitor element is connected to the output of the inverter element and to ground, and a fourth capacitor element has one end connected to ground. A second switching element switches a connection state of the one end of the third capacitor element and another end of the fourth capacitor element.

Semiconductor device and semiconductor system

A circuit board device includes: a printed wiring board; an IC chip provided on an obverse surface of the board and having at least one ground terminal; and a wiring pattern, disposed on the board, for providing a ground potential to the ground terminal of the IC chip. The wiring pattern is disposed on a reverse surface of the printed wiring board. The circuit board device has at least one via that is connected to the wiring pattern and passes through the printed wiring board at a position within a region where the IC chip is mounted on the obverse surface of the printed wiring board.

Circuit board device and printed wiring board

Circuit board device

A differential amplifier circuit can reduce consumption current and the circuit size while improving a power supply rejection ratio. The differential amplifier circuit includes a power supply line and an input part that includes an input circuit and an active load. The input circuit includes two differential input elements, and the active load includes two transistors connected to the two differential input elements. The input part generates a differential signal in response to an input signal given to the two differential input elements. The differential amplifier circuit also includes an amplifying part for generating an output voltage generating signal by amplifying the differential signal. The differential amplifier circuit also includes an output part for generating an output voltage based on the output voltage generating signal and a power supply voltage. The differential amplifier circuit includes a noise permitting part located between control terminals of the two transistors and the power supply line.

Growing community of inventors

Yokohama, Japan

Tetsuo Oomori