A Broadband SiGe HBT Cascode Power Amplifier Achieving Watt-Level Peak Output Power With 38.6% PAE and 90.9% Large-Signal Fractional Bandwidth

This brief presents a broadband SiGe power amplifier that achieves 30.1 dBm peak \text{P}_{SAT} , 38.6% peak power-added efficiency (PAE), 90.9% large-signal fractional bandwidth (FBW) and a 3 dB bandwidth from 5.4 to 13.8 GHz. A balanced topology with two-stage, four-way combing is utilized to ach...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2022-12, Vol.69 (12), p.4734-4738
Main Authors: Wan, Chuanchuan, Zhang, Hao, Zhao, Yuan, Zeng, Ming, Dong, Jiayu, Li, Ling, Wang, Keping
Format: Article
Language:English
Subjects:
90° coupler
balanced
Bandwidths
Broadband
Couplers
Impedance
Phased-array
Power amplifiers
power amplifier~(PA)
power combing
Power efficiency
Power generation
SiGe
Silicon germanides
Silicon germanium
Topology
transformer
Transformers
Transistors
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Summary:This brief presents a broadband SiGe power amplifier that achieves 30.1 dBm peak \text{P}_{SAT} , 38.6% peak power-added efficiency (PAE), 90.9% large-signal fractional bandwidth (FBW) and a 3 dB bandwidth from 5.4 to 13.8 GHz. A balanced topology with two-stage, four-way combing is utilized to achieve watt-level output power and high-power efficiency in a wide range of operating frequency. Power stage is optimized and simulated from the perspective of high output power. At the output stage, a 90° coupler and two transformers are co-optimized for broadband output power combining as well as power matching. This balanced PA is implemented in a 0.13- \boldsymbol {\mu }\text{m} SiGe BiCMOS process with a chip area (with pads) of 2.31 mm2.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2022.3206113