Renesas Electronics Corporation

Takahiro Shimoi

Koichi Takeda

Akihiko Kanda

Hidenori Mitani

Ken Matsubara

Genta Watanabe

Yoshinobu Kaneda

Masaya Nakano

A clamp elementapplies a fixed potential to a bit line BL at a time of a readout operation. A reference current source RCS generates a reference current Iref. An offset current source OCSis activated at a time of a readout operation for an OTP cell OTPC, and at a time of being activated, generates an offset current Iofto be subtracted from a cell current Icel. At the time of the readout operation for the OTP cell OTPC, the sense amplifier SA detects a magnitude relationship between the reference current Iref and a readout current Ird obtained by subtracting the offset current Ioffrom the cell current Icel.

Semiconductor device

Speed enhancement of data reading is achieved while suppressing an influence of an offset voltage of a differential amplifier. The differential amplifier includes: a current source that is connected to a first power supply in which a suppliable current is a first current; an active element pair that is connected to the current source, and amplifies a signal input to an input terminal pair to output an output signal pair; a load element pair that is connected to a second power supply different in power supply voltage from the first power supply, the load element pair serving for outputting the output signal pair to an output terminal pair; and a capacitance element pair that is inserted between an external input terminal pair and the input terminal pair; a switching element pair that charges the capacitance element pair to generate a voltage, which is obtained by converting an offset voltage of the input terminal pair into an input voltage, in the capacitance element pair by short-circuiting corresponding terminals between the output terminal pair and the input terminal pair; and a current control circuit that controls a current suppliable by the current source to a second current larger than the first current at a time of performing the charge.

Differential amplifier, semiconductor device and offset cancellation method

A semiconductor device capable of changing a data programming process in a simple manner according to a situation is provided. The semiconductor device includes a plurality of memory cells, a programming circuit for supplying a programming current to the memory cell, and a power supply circuit for supplying power to the programming circuit. The power supply circuit includes a charge pump circuit for boosting the external power supply, a voltage of the external power supply according to the selection indication, and a selectable circuit capable of switching the boosted voltage boosted by the charge pump circuit. The control circuit further includes a control circuit for executing data programming processing by the programming circuit by switching the selection indication.

Semiconductor device and semiconductor system

Growing community of inventors

Tokyo, Japan

Takahiro Shimoi