Fujitsu Corporation

Toru Mizutani

Hiromi Nanba

Kunihiko Gotoh

Osamu Kobayashi

A semiconductor integrated circuit comprises a digital-to-analogue converter for converting a digital signal into an analogue signal to output an analogue current signal, a current-to-voltage converter for converting the analogue current signal output by the digital-to-analogue converter, into an analogue voltage signal whose level has been controlled, and a filter for filtering the analogue voltage signal converted by the current-to-voltage converter. The current-to-voltage converter converts the current signal into the voltage signal in which a factor variable in accordance with manufacturing process conditions and/or environmental conditions has been corrected.

Semiconductor integrated circuit

A protection circuit includes a first protection circuit, which is coupled between a signal output terminal of an internal circuit and an external connection terminal and which prevents an abnormal voltage applied to the external connection terminal from being input to the signal output terminal. The protection circuit also includes a second protection circuit, which is coupled between a signal input terminal of the internal circuit and the external connection terminal and which prevents the abnormal voltage applied to the external connection terminal from being input to the signal input terminal. The signal input terminal is operatively coupled to the signal output terminal via the first and second protection circuit and has an impedance higher than that of the signal output terminal.

Growing community of inventors

Kawasaki, Japan

Toru Mizutani