Patent ID: 7944310
Filing Date: 2011-05-17
Classification: H03H

Abstract:
1. An active balun circuit, comprising: an input end, for receiving an input signal; a first output end and a second output end; a first transistor, comprising a drain coupled to the second output end, and a gate coupled to the input end; a second transistor, comprising a drain coupled to the first output end, and a gate coupled to a ground end; a feedback capacitor, coupled between the second output end and the gate of the second transistor; a current source, comprising two ends, one end thereof is coupled to sources of the first and second transistors, and the other end thereof is coupled to the ground end; and a first capacitor and a second capacitor, wherein the first capacitor is coupled between the gate of the first transistor and the input end, and the second capacitor is coupled between the gate of the second transistor and the ground end.