A Dual-Power-Mode Output Matching Network for Digitally Modulated CMOS Power Amplifier

A dual-power-mode output matching network for a digitally modulated power amplifier (DMPA) to improve low power efficiency is proposed. The DMPA with output matching network is fully integrated using a 0.13- μm RF CMOS process. The matching network incorporates a switched transformer and capacitors....

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2013-04, Vol.61 (4), p.1570-1579
Main Authors: LEE, Yumi, HONG, Songcheol
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Circuit properties
CMOS integrated circuits
CMOS power amplifier (PA)
Design. Technologies. Operation analysis. Testing
Digital circuits
digitally modulated power amplifier (DMPA)
dual-power-mode matching network
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Impedance
Impedance matching
Inductance
Integrated circuits
polar transmitter
Power generation
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
switched transformer
Switches
Switching, multiplexing, switched capacity circuits
Transistors
tunable matching network
WCDMA
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Summary:A dual-power-mode output matching network for a digitally modulated power amplifier (DMPA) to improve low power efficiency is proposed. The DMPA with output matching network is fully integrated using a 0.13- μm RF CMOS process. The matching network incorporates a switched transformer and capacitors. The switched transformer is proposed for tuning its inductance to have two power modes. It is designed to minimize losses due to parasitic components of the switch transistor. The DMPA has a 12-bit resolution to enable a wide digital transmit power control (TPC) range. The peak power is 29.3 dBm with 34% efficiency. The efficiency at 16 dBm is improved from 8% to 13% by using the output matching network. Simple static predistortion helps the DMPA reconstruct 27.9-dBm WCDMA signals at 1.95 GHz with 31% efficiency. The digital TPC range is 25 dB.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2013.2246525