Gradient amplifier system for driving a gradient coil and configuration method

A gradient amplifier system for driving a gradient coil in a magnetic resonance imaging device, the gradient amplifier system comprising:

• a gradient amplifier configured to drive a gradient current through the gradient coil;
• a gradient filter;
• a state space feedback controller in the digital domain coupled to the gradient amplifier for controlling the gradient current in the gradient coil;
• a feedback loop configured to feed a state limited to the gradient current back to the state space feedback controller, wherein the state space feedback controller is configured by determining control factors of the state space feedback controller based on the state limited to the feedback gradient current to achieve a part of predetermined poles of a rational transfer function independent of feedback from the gradient filter;
• wherein the gradient amplifier system is describable by the rational transfer function and actual poles of the rational transfer function is dependent on a configuration of the state space feedback controller;
• and
• wherein the gradient filter is configured after the configuration of the state space feedback controller by determining filter inductance and/or filter capacitance of the gradient filter to achieve actual poles shifting minimally with respect to the predetermined poles.