Semiconductor device and electronic apparatus using the same

A semiconductor device comprising:

• a first transistor;
• a second transistor;
• a first capacitor;
• a second capacitor;
• a third capacitor;
• a first switch;
• a second switch;
• a third switch;
• a fourth switch;
• a fifth switch;
• a sixth switch;
• a seventh switch;
• an eighth switch;
• and
• a ninth switch,
• wherein the first transistor and the second transistor have the same polarity,
• wherein a gate of the first transistor is electrically connected to one terminal of the first capacitor and one terminal of the sixth switch,
• wherein the other terminal of the first capacitor is electrically connected to one terminal of the first switch and one terminal of the second switch,
• wherein the other terminal of the second switch is electrically connected to one of a source and a drain of the first transistor, one of a source and a drain of the second transistor, one terminal of the fourth switch, and one terminal of the eighth switch,
• wherein the other terminal of the eighth switch is electrically connected to one terminal of the third capacitor and one terminal of the ninth switch,
• wherein the other of the source and the drain of the first transistor is electrically connected to one terminal of the fifth switch,
• wherein the other terminal of the fourth switch is electrically connected to a gate of the second transistor and one terminal of the second capacitor,
• wherein the other terminal of the second capacitor is electrically connected to the other of the source and the drain of the second transistor,
• wherein the other of the source and the drain of the second transistor is electrically connected to a first power supply line,
• wherein one terminal of the third switch is electrically connected to one terminal of the seventh switch,
• wherein the other terminal of the first switch is electrically connected to an input terminal, and
• wherein the other terminal of the third switch is electrically connected to an output terminal.

A display device comprising:

• a pixel portion over a substrate;
• and
• a source follower circuit over the substrate, the source follower circuit comprising:
• a first transistor;
• a second transistor;
• a first capacitor;
• a second capacitor;
• a third capacitor;
• a first switch;
• a second switch;
• a third switch;
• a fourth switch;
• a fifth switch;
• a sixth switch;
• a seventh switch;
• an eighth switch;
• and
• a ninth switch,
• wherein the first transistor and the second transistor have the same polarity,
• wherein a gate of the first transistor is electrically connected to one terminal of the first capacitor and one terminal of the sixth switch,
• wherein the other terminal of the first capacitor is electrically connected to one terminal of the first switch and one terminal of the second switch,
• wherein the other terminal of the second switch is electrically connected to one of a source and a drain of the first transistor, one of a source and a drain of the second transistor, one terminal of the fourth switch, and one terminal of the eighth switch,
• wherein the other terminal of the eighth switch is electrically connected to one terminal of the third capacitor and one terminal of the ninth switch,
• wherein the other of the source and the drain of the first transistor is electrically connected to one terminal of the fifth switch,
• wherein the other terminal of the fourth switch is electrically connected to a gate of the second transistor and one terminal of the second capacitor,
• wherein the other terminal of the second capacitor is electrically connected to the other of the source and the drain of the second transistor,
• wherein the other of the source and the drain of the second transistor is electrically connected to a first power supply line,
• wherein one terminal of the third switch is electrically connected to one terminal of the seventh switch,
• wherein the other terminal of the first switch is electrically connected to an input terminal,
• wherein the other terminal of the third switch is electrically connected to an output terminal,
• wherein the pixel portion comprises a third transistor and a display element,
• wherein the third transistor is electrically connected to the display element, and
• wherein the source follower circuit is operationally connected to the pixel portion.