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Summary: THIF-54
High Efficiency Current-Mode Class-DAmplifier
with Integrated Resonator
Tsai-PiHung, Andre G. Metzger, Peter J. Zampardi", Masaya Iwamoto** and Peter M. Asbeck
Department of Electrical Engineering
University of Califomia, SanDiego, La Jolla, CA 92093
*SkyworksSolutions,Newbury Park, CA 91320
**AgilentTechnologies, Santa Rosa, CA 94543
Absfract - This paper shows that current mode class-D
(CMCD) amplifiers with integrated parallel LC resonator
can achieve high efficiency at RF frequencies. In contrast to
the conventionalclass-D amplifier, output shunt capacitance
discharge loss is eliminated in a CMCD amplifier topology
by satisfyingthe zero voltage switching (ZVS) condition. To
reduce parasitic resistance, bondwires are utilized to
implement a high Q inductor in the LC resonator. An
experimental CMCD amplifier with collector efficiency of
78.5% at output power of 29.5dBm (0.89W) is demonstrated
using GaAs HBTs at 700MHz
Index Terms -Bondwire inductor, current mode class-D,
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