| 摘要 |
PURPOSE: A semiconductor device is provided to form an LC tank on a semiconductor substrate, thereby arranging first and second MOS varactors between first and second spiral inductors. CONSTITUTION: A first MOS varactor(C1), a second MOS varactor(C2), a stabilization circuit(24), and an output buffer(21) are arranged in an area surrounded by a straight line LN2, a straight line LN3, a straight line LN6, and a straight line LN7 in a direction vertical to a semiconductor substrate. The straight line LN2 is vertical to a straight line LN1 which connects the center of a first spiral inductor(L1) with the center of a second spiral inductor(L2). The straight line LN3 is vertical to the straight line LN1 which connects the center of the first spiral inductor with the center of the second spiral inductor. A power line(VDD) and a ground power line(VSS) are vertically arranged in the first and second spiral inductors, the first and second MOS varactors, the stabilization circuit, and an output buffer. |
