Stability Test Method for Cartesian Feedback Power Amplifier in pTx Array

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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