Near-Magnet Power Amplifier with built-in Coil Current Sensing

A new concept of a near-magnet PA is presented which operates without circulator/isolator but closely cooperates with the coil to allow control of the coil current. The concept features a voltage probe at the PA output and a tuned transmission line connecting the coil. The probe voltage is proportional to the coil current which allows control of the coil current under mismatch and mutual coupling from other coils in an pTx array without extra pick-up loop. The function is demonstrated by an experimental set-up creating a wide range of load impedance by varying the coil distance to a phantom.

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