Patent ID: 8502348
Filing Date: 2013-08-06
Classification: H01L

Abstract:
1. A differential varactor device, comprising: a substrate, having a first conductive type; a well, disposed in the substrate, and the well having a second conductive type; five first doped regions, disposed in the well and arranged in a first direction, and the first doped regions having the second conductive type; and a first gate, a second gate, a third gate and a fourth gate, respectively disposed on the well between any two of the adjacent first doped regions and arranged sequentially in the first direction, wherein the first gate and the third gate are electrically connected to a first output terminal, the second gate and the fourth gate are electrically connected to a second output terminal different from the first output terminal, and the first output terminal and the second output terminal are not electrically connected to the first doped regions.