The Doherty power amplifier using UMC CMOS 0.18um is designed at a frequency of 2.4 GHz. Characterized by the S-parameter measurement, the S21 is 10.6dB. The maximum output power and P1dB can achieve 22.6dB and 21.4dBm, respectively. The maximum PAE is 33.6% and the PAE is 32.6% at P1dB. At 6dB back-off from P1dB, the achieved PAE is 21.1%. Without using on-chip spiral inductors, the area of the PA is only 666*999 µm2.
