Abstract:A GSM900/1800 Dual-Band AlGaAs /GaAs HBT(Hetero-junction Bipolar Transistor) MMIC power amplifier has been developed. It includes power amplifiers for GSM900 and DCS1800, constant voltage bias circuits and d.c. switch. A novel multi-finger HBT layout which can realize uniform output load impedance and thermal distribution of each HBT finger are applied to the final-stage HBT in order to achieve high efficiency. The developed MMIC amplifier has provided output power of 34.5dBm and power-added efficiency of 53.4… Show more
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