Patent ID: 9438170
Filing Date: 2016-09-06
CPC Classification: H03F

Claim Text:
1. A power amplifier, comprising: an input circuit configured to receive an input signal; at least three transistors connected in series, wherein a first transistor of the at least three transistors is located at a first end of the at least three transistors, a second transistor of the at least three transistors is located at a second end of the at least three transistors, a third transistor of the at least three transistors is connected in series between the first transistor and the second transistor, the first transistor is coupled to a low voltage power supply node, a first gate of the first transistor is coupled to a first bias voltage, and the input signal is coupled to the first gate of the first transistor; at least one capacitor coupled between a second gate of the second transistor and the low voltage power supply node; and an output circuit coupled to a drain of the second transistor; wherein a second gate of the second transistor is connected to a second bias voltage through a resistive capacitive circuit and the gate of the third transistor is connected to a third bias voltage through a resistive only circuit.