摘要 |
PROBLEM TO BE SOLVED: To provide a miniaturized multi-band power amplification system having enhanced efficiency and reduced size.SOLUTION: A multi-band power amplification system 100 include a PA (power amplifier) die or PA module device 270, having a dimension of d3×d4. The power amplification system includes a plurality of PAs, with each PA being configured to receive and amplify a radio-frequency (RF) signal in frequency bands A and B. The power amplification system includes an output filter coupled to the corresponding PA by a separate output path such that the power amplification system is substantially free of a band selection switch between the plurality of PAs and their corresponding output filters. Each PA is configured to drive approximately the characteristic load impedance of the corresponding output filter by being operated with a high-voltage Vcc supply.SELECTED DRAWING: Figure 15 |