Patent ID: 8693617

Claim:
A semiconductor device comprising: a first transistor; a second transistor; a third transistor; a fourth transistor; a fifth transistor; a sixth transistor; wherein one of source and drain of the first transistor is electrically connected to one of source and drain of the second transistor, wherein one of source and drain of the third transistor is electrically connected to a gate of the first transistor, wherein one of source and drain of the fourth transistor is electrically connected to a gate of the first transistor, wherein a gate of the fourth transistor is electrically connected to a gate of the second transistor, wherein one of source and drain of the fifth transistor is electrically connected to a gate of the second transistor, wherein one of source and drain of the sixth transistor is electrically connected to the other of source and drain of the fifth transistor, and wherein a ratio W/L of a channel width W to a channel length L of the fourth transistor is smaller than a ratio W/L of a channel width W to a channel length L of the first transistor.