Patent ID: 7061320
Filing Date: 2006-06-13
Classification: H03F

Abstract:
1. A differential amplifier comprises: an input-stage differential amplifier circuit having a first and a second input terminals and a first and a second output terminals; a first source follower circuit having a first-polar transistor, wherein the first output terminal of the differential amplifier circuit is connected to a gate; a second source follower circuit having a first-polar transistor, wherein the first output terminal of the differential amplifier circuit is connected to a gate; a source ground amplifier circuit having a first-polar transistor, wherein an output terminal of the second source follower circuit is connected to a source, the second output terminal of the differential amplifier circuit is connected to a gate, and a load resistance is connected to a drain; and an output-stage amplifier circuit comprised of a first-polar transistor, wherein an output terminal of the first source follower circuit is connected to a gate, and a second-polar transistor, wherein an output terminal of the source ground amplifier circuit is connected to agate, serially connected to each other.