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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2013-01-24
Study of the Inter-Stage Capacitor Effects of a RF CMOS Power Amplifier to Enhance Its Efficiency
By
Hoyong Hwang,

    Dr. Hoyong Hwang

    School of Electronic Engineering, College of Information Technology

    Soongsil University

    Republic of Korea

    Homepage

Donghwan Seo,

    Dr. Donghwan Seo

    School of Electronic Engineering, College of Information Technology

    Soongsil University

    Republic of Korea

    Homepage

Jonghoon Park,

    Mr. Jonghoon Park

    College of Information Technology

    Soongsil University

    Republic of Korea

    Homepage

Changkun Park

    Dr. Changkun Park

    School of Electronic Engineering

    Soongsil University

    South Korea

    Homepage

Progress In Electromagnetics Research C, Vol. 37, 29-40, 2013
doi:10.2528/PIERC12122806 | Google Scholar

Abstract
In this work, we analyze the effects of an inter-stage capacitor located between the power stage input and the driver stage output on the overall efficiency of a RF CMOS power amplifier and on gate-drain reliability problems. To verify the analyzed effects, we designed a RF CMOS power amplifier with a center frequency of 1.85-GHz. Class-D amplifiers with a feedback resistor are used as driver stages, and a class-E amplifier is used as the power stage. A distributed active transformer is adapted for use in the output power combiner for high efficiency. The inter-stage capacitor between driver and the power stage is removed to enhance the switching operation of the power stage. By eliminating the inter-stage capacitor, the supply voltage of the driver stage can be decreased compared to that in a general amplifier. Accordingly, the power-added efficiency is improved and the gate-drain reliability problems are moderated compared to a general amplifier. The analyzed effect of the inter-stage capacitor is verified successfully using the measured results of the designed amplifiers.
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Citation
Hoyong Hwang, Donghwan Seo, Jonghoon Park, and Changkun Park, "Study of the Inter-Stage Capacitor Effects of a RF CMOS Power Amplifier to Enhance Its Efficiency," Progress In Electromagnetics Research C, Vol. 37, 29-40, 2013.
doi:10.2528/PIERC12122806
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