Abstract: A signal transmission circuit includes an input node through which an input rectangular waveform is supplied, an inverter that generates an inverted input signal, a push-pull circuit that generates an output signal of the signal transmission circuit, a first drive circuit that generates a first drive signal for the push-pull circuit from the inverted input signal and a first adjusted waveform, and a second drive circuit that generates a second drive signal for the push-pull circuit from the inverted input signal and a second adjusted waveform. The first adjusted waveform falls with a first time constant when the input rectangular waveform is high and the second adjusted waveform rises with a second time constant when the input rectangular waveform is low. The output signal of the signal transmission circuit has a rise time correlated to the first adjusted waveform and a fall time correlated to the second adjusted waveform.

Abstract: According to an embodiment, a voltage regulator having an output transistor, a voltage dividing circuit, an error amplifier, a detection circuit and a phase compensation capacitance circuit is provided. The output transistor has one end to which a power supply voltage is supplied, a control terminal to which a control signal is input, and the other end which outputs an output voltage. The voltage dividing circuit is connected between the other end of the output transistor and a first reference voltage. The error amplifier is configured to output the control signal according to the difference between a divided voltage and a second reference voltage. The detection circuit is configured to detect an operation environment. The phase compensation capacitance circuit is configured to adjust a phase compensation capacitance between the other end of the output transistor and an input terminal of the error amplifier, in accordance with the detected operation environment.

Abstract: A switching circuit includes a plurality of switching elements connected between an input node and an output node and each comprising a first and second electrode connected to the input node and output node, respectively. The switching elements include a control electrode for controlling electrical conductance between the first and second electrodes such the switching element can be switched between an ON conductance state and an OFF conductance state. A detection circuit in the switching circuit outputs a detection value corresponding to an output current at the output node. A control circuit changes the conductance state of at least one switching element such that the summed total of the parasitic capacitances of all switching elements in the ON state decreases as the output current decreases as indicated by the detection value.

Abstract: A switching circuit includes a plurality of switching elements connected between an input node and an output node and each comprising a first and second electrode connected to the input node and output node, respectively. The switching elements include a control electrode for controlling electrical conductance between the first and second electrodes such the switching element can be switched between an ON conductance state and an OFF conductance state. A detection circuit in the switching circuit outputs a detection value corresponding to an output current at the output node. A control circuit changes the conductance state of at least one switching element such that the summed total of the parasitic capacitances of all switching elements in the ON state decreases as the output current decreases as indicated by the detection value.

Abstract: According to an embodiment, a voltage regulator having an output transistor, a voltage dividing circuit, an error amplifier, a detection circuit and a phase compensation capacitance circuit is provided. The output transistor has one end to which a power supply voltage is supplied, a control terminal to which a control signal is input, and the other end which outputs an output voltage. The voltage dividing circuit is connected between the other end of the output transistor and a first reference voltage. The error amplifier is configured to output the control signal according to the difference between a divided voltage and a second reference voltage. The detection circuit is configured to detect an operation environment. The phase compensation capacitance circuit is configured to adjust a phase compensation capacitance between the other end of the output transistor and an input terminal of the error amplifier, in accordance with the detected operation environment.

Abstract: A circuit unit is provided. The circuit unit has an intermittent operation circuit. The intermittent operation circuit is set in an operation state and in a stand-by state periodically. An operation mode control unit generates a test mode control signal to designate either an operation test mode or an intermittent operation test mode of the intermittent operation circuit. The operation test mode corresponds to one of a continuous operation or a predetermined time period operation of the intermittent operation circuit. An operation timing generation unit receives the test mode control signal. The operation timing generation unit produces an operation control signal based on the test mode control signal. The operation control signal is outputted to the intermittent operation circuit to operate or wait the intermittent operation circuit.

Abstract: A demand for a change in the operating condition of at least one of a plurality of vehicle mounted devices is issued by means of a single push button switch attached to the center of the steering wheel. When the vehicle occupant intends to manipulate a device such as a radio, stereo unit or an air conditioner, he depresses the switch to supply a microcomputer with a demand signal. The microcomputer produces an instruction signal with which a sound synthesizer produces sequential vocal announcements which are emitted via a speaker. The occupant depresses the switch again within a predetermined period of time after the emission of a vocal announcement naming a device intended to control so that the sound synthesizer now provides various manipulative information relating to the available manipulations of the selected device. The driver depresses the switch to issue responsive instructions in response to an announcement of desired manipulation.