Patent ID: 6835982
Filing Date: 2004-12-28
Classification: H01L

Abstract:
A semiconductor device having a SOI MOSFET in which a MOSFET is formed in a silicon single crystal formed on a dielectric film, the semiconductor device comprising:a SOI MOSFET including means for performing a BTS (Body-Tied-to-Source) operation that satisfies three conditions as follows: Condition 1: A capacitive coupling occurs during a circuit operation: Rb>Rrc, {wherein Rb is a body-to-body terminal resistance (body resistance), and Rrc is a resistance dependent on a circuit operation frequency}; Condition 2: A body potential under a steady state becomes about zero at an off bias (in which a gate voltage Vgs=0, and a drain voltage Vds=VDD (power supply voltage)): Vbs,standby=âˆ’[Idiode (Vbs,standby)+Idiode (Vbs,standby âˆ’VDD)]Ã—Rbâ‰…0, {wherein Vbs,standby is a body potential in a steady state at an off bias, Idiode is a diode current including impact ionization current, VDD is a power supply voltage, and Rb is a body-to-body terminal resistance (body resistance)}; and Condition 3: A current that penetrates a body terminal during a circuit operation is sufficiently larger than a current that flows upon generation and recombination of carriers: |Ib|>>|Idiode|, {wherein Ib is a penetration current at the body terminal, and Idiode is a diode current including impact ionization current}.