A Temperature and Supply Independent Bias Circuit and MMIC Power Amplifier Implementation for W-CDMA Applications

Youn Sub NOH
Jong Heung PARK
Chul Soon PARK

IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.4    pp.725-728
Publication Date: 2005/04/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.4.725
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
power amplifier,  heterojunction bipolar transistor (HBT),  MMIC,  W-CDMA,  temperature,  supply,  bias circuit,  

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A novel bias circuit providing a stable quiescent current for temperature and supply voltage variations is proposed and implemented to a W-CDMA MMIC power amplifier. The power amplifier with the proposed bias circuit has the quiescent current variation of only 6% for the -30 to 90 temperature change, and 8.5% for the 2.9 V to 3.1 V supply voltage change, and the variation of the power gain at the 28 dBm output power is less than 0.8 (0.05) dB for the 0.1 V of supply voltage (60 of temperature) variation.