Abstract #0546
Large-Signal Characterization of Coupled RF Amplifiers for Parallel Transmit
Michael Twieg 1 and Mark A Griswold 1,2
1
Dept. of Electrical Engineering and Computer
Science, Case Western Reserve University, Cleveland, OH,
United States,
2
Dept.
of Radiology, Case Western Reserve University,
Cleveland, OH, United States
We present a fast and powerful method of experimentally
quantifying the effective open loop output impedance and
power efficiency of coupled power amplifier topologies
across their full control space. We demonstrate the use
of the method for characterizing a Current Mode Class D
(CMCD) amplifier at 10 MHz. The results demonstrate some
of the unique qualities associated with switch mode
power amplifiers, such as the complex nature of their
effective output impedance, and the ability to recover,
rather than dissipate, power coupled from other transmit
elements. This methodology greatly facilitates the
evaluation of amplifiers for parallel transmit
applications.
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