Mitsubishi Denki Kabushiki Kaisha

Ken-ichi Uto

Kuniaki Motoshima

The self-bias adjustment circuit is provided on the previous stage of an internal circuit. This self-bias adjustment circuit adjusts a bias of an input signal and supplies an appropriate signal to the internal circuit. The self-bias adjustment circuit includes a detection circuit that detects the bias voltage of the input signal, and a superposing circuit that superposes a correction voltage for correcting the bias voltage to a predetermined value on the input signal on the basis of the bias voltage detected by the detection circuit. The result signal is supplied to the internal circuit.

Self-bias adjustment circuit

The amplifier circuit includes differential amplifier circuits ( to ); a peak detector circuit ( ) for detecting a peak value of an output voltage of a differential amplifier circuit of the last stage; an offset compensation voltage generator circuit ( ) for generating an offset compensation voltage for offset compensation on the basis of a detection result of the peak detector circuit ( ); and an offset output limiter circuit ( ) for limiting the offset compensation voltage generated by the offset compensation voltage generator circuit ( ) into a predetermined range and feeding back the limited offset compensation voltage to a differential amplifier circuit ( ) of the first stage.

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Tokyo, Japan

Ken-ichi Uto