Patent ID: 9407207
Filing Date: 2016-08-02
CPC Classification: H03F

Claim Text:
1. A radio frequency amplifying circuit comprising: an amplifying transistor configured to amplify a radio frequency signal input to a base of the amplifying transistor via a matching network to output an amplified radio frequency signal; a first bias transistor connected to the amplifying transistor based on a current-mirror connection to supply a bias to the amplifying transistor; a second bias transistor connected to the base of the amplifying transistor based on an emitter-follower connection to supply a bias to the amplifying transistor; a second amplifying transistor configured to amplify a radio frequency signal input, by the amplifying transistor, to a base of the second amplifying transistor via a matching network; a third bias transistor connected to the second amplifying transistor based on a current-mirror connection to supply a bias to the second amplifying transistor; a fourth bias transistor connected to a base of the second amplifying transistor based on an emitter-follower connection to supply a bias to the second amplifying transistor; and an input terminal for a first control voltage applied to collector sides of the first and third bias transistors and an input terminal for a second control voltage applied to base sides of the second and fourth bias transistors are independent and separate from each other.