Patent ID: 9503036
Filing Date: 2016-11-22
CPC Classification: H03F

Claim Text:
1. A power amplifier having a stack structure, comprising: a first driver stage that receives a power voltage from a power supply and receives and amplifies an input signal; a second driver stage that has a power input terminal connected with a ground terminal of the first driver stage and receiving a virtual ground voltage and an input terminal connected with an output terminal of the first driver stage, and receives and amplifies an output signal from the first driver stage; and a power stage that receives the power voltage from the power supply and has an input terminal connected with an output terminal of the second driver stage, and receives and amplifies an output signal from the second driver stage, wherein a ground terminal of the second driver stage is connected with a power input terminal of the first driver stage and a virtual ground voltage is applied to the first driver stage, and the power voltage is applied to the second driver stage from the power supply.