POWER AMPLIFIER HAVING STACK STRUCTURE

摘要

The present invention relates to a power amplifier which has a stack structure. The power amplifier includes: a first driving amplifier stage in which a power supply voltage is applied from a power source and which receives and amplifies an input signal; a second driving amplifier stage in which a virtual grounding voltage is applied by being connected to the grounding stage of the first driving amplifier stage at a power input stage and which receives and amplifies the output signal of the first driving amplifier stage by being connected to the output stage of the first driving amplifier stage at the input stage; and power amplifier stage in which the power supply voltage is applied from the power source and which receives and amplifies the output signal of the second driving amplifier stage by being connected to the output stage of the second driving amplifier stage at the input stage. According to the forementioned, the power amplifier is able to reduce the number of regulators which supply the power supply voltage and also reduce the designed area of an integrated circuit by connecting multiple driving amplifier stages which comprise a multi-stage amplifier in the stack structure. [Reference numerals] (AA) Input;(BB) Output