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公开(公告)号:US09602059B2
公开(公告)日:2017-03-21
申请号:US14769126
申请日:2014-03-20
发明人: Vincent Knopik
CPC分类号: H03F1/0222 , H03F1/0266 , H03F1/223 , H03F3/19 , H03F3/193 , H03F3/245 , H03F2200/102 , H03F2200/108 , H03F2200/15 , H03F2200/18 , H03F2200/451
摘要: An amplifier has an input port for receiving an input signal and an envelope port for receiving an envelope signal indicative of an envelope of the input signal, and an output port for delivering an amplified signal. The amplifier has a first transistor and a second transistor. A first biasing circuit is coupled to the envelope port and is arranged to generate a first bias voltage dependent on the envelope signal. A summing stage is coupled to the input port for receiving the input signal, to the first biasing circuit for receiving the first bias voltage, and to the gate of the first transistor. A second biasing circuit is coupled between the envelope port and the gate of the second transistor, and is arranged to generate a second bias voltage dependent on the envelope signal.