Patent ID: 6864539

Claim:
A semiconductor integrated circuit device comprising: a MISFET, having a source electrode and a drain electrode of a first conductivity type and a gate electrode, formed in a well of a second conductivity type; and a body biasing circuit that generates a voltage in said well by passing a prescribed current in a forward direction into a diode formed from said well and said source electrode of said MISFET, said body biasing circuit including a current source provided between a first power supply line and a contact region of said well and passing said prescribed current into said diode via said contact region, and said current source generating said prescribed current using said first power supply line as a power supply source, wherein said current source comprises: a current-source first MISFET having the same polarity as said MISFET, and whose gate electrode is supplied with a control signal and whose source electrode is connected to a second power supply line, a current-source second MISFET having a different polarity from said MISFET, and whose source electrode is connected to said first power supply line and whose drain electrode and gate electrode are connected to a drain electrode of said current-source first MISFET, and a current-source third MISFET connected to said current-source second MISFET in a current-mirror configuration, and whose drain is connected to said contact region.