Patent ID: 7847598

Claim:
A sense amplifier comprising: first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth switches; first, second, third, and fourth capacitors, wherein a second terminal of the first capacitor is electrically connected to a first terminal of the fifth switch and a first terminal of the seventh switch, and a second terminal of the second capacitor is electrically connected to a first terminal of the eighth switch and a first terminal of the sixth switch; first and second power sources; a first resistor having a first terminal electrically connected to the first power source and a second terminal electrically connected to a first terminal of the first switch; a second resistor having a first terminal electrically connected to the first power source and a second terminal electrically connected to a first terminal of the second switch; a first NMOS transistor, wherein a gate of the first NMOS transistor is electrically connected to a second terminal of the third switch, a first terminal of the first capacitor, and a first terminal of the third capacitor; a second NMOS transistor, wherein a gate of the second NMOS transistor is electrically connected to a second terminal of the fourth switch, a first terminal of the second capacitor, and a first terminal of the fourth capacitor, and both sources of the first and second NMOS transistors are electrically connected to a second terminal of the third capacitor, a second terminal of the fourth capacitor, and the second power source through the ninth switch; and an output terminal electrically connected to the second terminal of the second resistor, wherein a second terminal of the first switch is electrically connected to a drain of the first NMOS transistor and a first terminal of the third switch, and a second terminal of the second switch is electrically connected to a drain of the second NMOS transistor and a first terminal of the fourth switch, wherein a second terminal of the seventh switch and a second terminal of the eighth switch are electrically connected to the second power source, and wherein a first input terminal is electrically connected to the second terminal of the first capacitor through the fifth switch and a second input terminal is electrically connected to the second terminal of the second capacitor through the sixth capacitor.