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This thesis researches on 1.8/2.4GHz variable gain power amplifier with power switch embedded. The chip is fabricated in UMC standard 0.18um 1P6M CMOS process. After measuring, the chip at frequency 1.8GHz exhibits an input return loss of 11.4dB, output return loss of 12.6dB, gain of 20.8dB, output P1dB of 5.8dBm, OIP3 of 15.4dBm, maximum output power of 4.62dBm, PAE(Power Added Efficiency) of 5.7% and variable gain range of 13.2dB to 20.8dB. On the other hand, the chip at frequency 2.4GHz exhibits an input return loss of 11.7dB, output return loss of 13.4dB, gain of 10.1dB, output P1dB of 0.1dBm, OIP3 of 9.8dBm, maximum output power of 0.43dBm, PAE of 1.8% and variable gain range of 2.1dB to 10.1dB.
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