Multistage amplifier circuit capable of boosting output power

摘要

A drain current flowing through a first transistor in a multistage amplifier circuit and a drain current flowing through a second transistor may have different current values from each other by a current regulator circuit. As a result, the amplifying operation of the second transistor may not be saturated even when the output power of the first transistor is increased. Accordingly, the circuit can operate with low current consumption and improve the output power.