SEMICONDUCTOR DEVICE, AND IMPEDANCE CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide an impedance controller whose circuit area is reduced. SOLUTION: A semiconductor device according to the present invention includes a first replica transistor P2 formed according to a first transistor P1 included in a circuit 10 to be controlled and a first substrate bias control circuit 20 which supplies a first substrate bias voltage Vb1to the first transistor P1 to control the impedance of the circuit 10 to be controlled. The first substrate bias voltage Vb1 is fed back to the first substrate bias control circuit 20 through the first replica transistor P2 to control the output impedance of the circuit 10 to be controlled. COPYRIGHT: (C)2008,JPO&INPIT