US Patent 10504920 Semiconductor device

An area occupied by a circuit element having at least a capacitor and a transistor is reduced in a semiconductor device. In a semiconductor device including a first transistor, a second transistor, and a capacitor, the first transistor and the capacitor are provided over the second transistor. Then, a common electrode, which serves as one of a source and a drain of the first transistor and one electrode of the capacitor, is provided. In addition, the other electrode of the capacitor is provided over the common electrode.