A 1.8-GHz CMOS Power Amplifier Using a Dual-Primary Transformer With Improved Efficiency in the Low Power Region

A 1.8-GHz CMOS power amplifier for a polar transmitter is implemented with a 0.18- RF CMOS process. The matching components, including the input and output transformers, were integrated. A dual-primary transformer is proposed in order to increase the efficiency in the low power region of the amplifi...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2008-04, Vol.56 (4), p.782-792
Main Authors: PARK, Changkun, HAN, Jeonghu, KIM, Haksun, HONG, Songcheol
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Circuit properties
Class-E
CMOS
CMOS process
Degradation
Design. Technologies. Operation analysis. Testing
Dynamic range
Electric, optical and optoelectronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
global system for mobile communication (GSM)
GSM
Impedance
Integrated circuits
load impedance
Matching
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
mode locking
Noise levels
polar transmitter
Power amplifiers
Power generation
Radio transmitters
Radiocommunications
Radiofrequency amplifiers
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Switches
Telecommunications
Telecommunications and information theory
transformer
Transformers
Transmitters. Receivers
variable load
Voltage
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Summary:A 1.8-GHz CMOS power amplifier for a polar transmitter is implemented with a 0.18- RF CMOS process. The matching components, including the input and output transformers, were integrated. A dual-primary transformer is proposed in order to increase the efficiency in the low power region of the amplifier. The loss induced by the matching network for the low-output power region is minimized using the dual-primary transformer. The amplifier achieved a power-added efficiency of 40.7% at a maximum output power of 31.6 dBm. The dynamic range was 34 dB for a supply voltage that ranged from 0.5 to 3.3 V. The low power efficiency was 32% at the output power of 16 dBm.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2008.918152