Fujitsu Corporation

Kunihiro Itoh

Noriyuki Tokuhiro

Osamu Uno

A driver circuit for driving a device or circuit disposed after it comprises a plurality of driving transistors connected in parallel, a selection unit for selecting one or more groups from a plurality of groups to each of which driving transistors having a power base of two with the same polarity belong and in which the number of driving transistors belonging to each group is different and a driving unit for driving driving transistors belonging to the group selected by the selection unit.

Driver circuit

A termination circuit for terminating a transmission line comprises a resistance unit which is formed by connecting a P-channel type MOS transistor and an N-channel type MOS transistor in parallel, and Thevenin termination is formed by providing this resistance unit between the transmission line and a power supply line and between the transmission line and a ground line.

Termination circuit

In an operation to supply an input signal IN having an amplitude equal to a first power-supply voltage VDDto the gate of a PMOS transistor PMoperating at a second power-supply voltage VDDhigher than the first power-supply voltage VDD, the levels of signals are converted by using PMOS transistors PMto PM. A signal obtained as a result of the conversion is output from the PMOS transistors PMand PM, being used for controlling electrical conduction of a PMOS transistor PM

Level conversion for use in semiconductor device

An output buffer includes a first drive circuit that receives an input signal having a sharp waveform and generates an output signal that has a gentle waveform. A second drive circuit is connected to the first drive circuit at an output terminal and has a lower impedance than the first drive circuit. A delay circuit is also connected to the output terminal and generates a delayed output signal. A first control circuit is connected between the delay circuit and the second drive circuit and receives the input signal and the delayed output signal and generates a first control signal used to drive the second drive circuit.

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Kasugai, Japan

Kunihiro Itoh