| 摘要 |
A multiple power mode amplifier provides a low and a high power mode without using switches. This amplifier may be used in radio frequency (RF) applications such as mobile telephones, pagers, portable digital assistants, and wireless e-mail devices. In the low power mode, the power consumption of the amplifier is reduced, which will increase operation time, especially important for battery-operated devices. In one implementation, the amplifier includes a number of impedance matching network units ( 130, 140, 150, and 160 ), impedance transformer ( 170 ), and a power stage ( 120 ). An implementation provides further power consumption savings by modulating a bias of an amplifier stage.
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