Abstract #3151
Stability Test Method for Cartesian Feedback Power Amplifier in pTx Array
Samaneh Shooshtary 1 , Adam Buck 1 , and Klaus Solbach 1
1
Institute of Microwave and RF Technology,
Duisburg-Essen University, Duisburg, Germany
A 7 Tesla system with parallel transmission is under
construction. The system will employ 32 near-magnet
power amplifiers (PA) with output power of 1 kW. Coil
current variation due to load variation can be
compensated by applying a Cartesian feedback loop in the
PA implementation. In order to avoid instability in the
pTx system, conditions and limits of stability have to
be investigated for every possible mode of operation.
This contribution presents the principle architecture of
our PA with control loop and proposes the root locus
method for concise stability check. We propose to use
this approach for stability investigations of the large
pTx array.
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