Two high power amplifiers (HPAs) for mobile communication terminals are introduced. One is a three-stage GaAs PHEMT HPA module for W-CDMA cellular phones, which achieves high efficiency of 43.9 with low distortion of ACPR of -38 dBc. The HPA employs a HPF/LPF combined interstage matching circuit to achieve high efficiency and low distortion at the maximum output power level. The other is a constant voltage/constant current (CV/CC) parallel operation one-stage HBT HPA, which can realize low quiescent current of 17 mA and ACPR of less than -40 dBc in the output power range up to 26.8 dBm for W-CDMA cellular phones. By combining two HBTs having different base bias circuits (CV and CC), non-linearity at large back-off region can be canceled out.
展开▼
