AN AMPLIFIER CIRCUIT HAVING A HIGH LINEARITY MODE OF OPERATION AND A HIGH EFFICIENCY MODE OF OPERATION

摘要

An amplifier circuit (100) has a high linearity mode of operation and a high efficiency mode of operation. The amplifier circuit (100) comprises plural amplifiers (104a to 104n) each having a variable active device periphery and a variable supply voltage, and a control circuit (102) coupled to the amplifiers (104a to 104n). The control circuit (102) provides signals which decrease the variable active device periphery and increase the variable supply voltage when the amplifier circuit (100) is to operate in a high linearity mode of operation, and increase the variable active device periphery and decrease the variable supply voltage when the amplifier circuit (100) is to operate in a high efficiency mode of operation.