Patent ID: 8847673

Claim:
A semiconductor device comprising: a first transistor; a second transistor; a third transistor; a fourth transistor; a first capacitor; a second capacitor; and a third capacitor, wherein one of a source and a drain of the first transistor is electrically connected to a first wiring, wherein the other of the source and the drain of the first transistor is electrically connected to a first terminal of the second capacitor, wherein a gate of the first transistor is electrically connected to a first terminal of the first capacitor, wherein one of a source and a drain of the second transistor is electrically connected to the first terminal of the first capacitor, wherein the other of the source and the drain of the second transistor is electrically connected to the first terminal of the second capacitor, wherein a gate of the second transistor is electrically connected to a second terminal of the second capacitor, wherein one of a source and a drain of the third transistor is electrically connected to a first terminal of the third capacitor, wherein the other of the source and the drain of the third transistor is electrically connected to a second wiring or the first terminal of the second capacitor, wherein a gate of the third transistor is electrically connected to the second terminal of the second capacitor, wherein one of a source and a drain of the fourth transistor is electrically connected to the second wiring, wherein the other of the source and the drain of the fourth transistor is electrically connected to the first terminal of the second capacitor, wherein a gate of the fourth transistor is electrically connected to the first terminal of the third capacitor, and wherein a second terminal of the first capacitor is electrically connected to a second terminal of the third capacitor.