Apparatus and method for amplifying a radio-frequency signal

A method of amplifying a radio-frequency signal, comprising:

• converting the RF signal in unbalanced format into balanced signals by a magnetically insensitive input balun;
• matching input impedances of at least two groups of MOSFETs with output impedances of the magnetically insensitive input balun by a magnetically insensitive input matching network;
• amplifying the balanced signals in a push-pull way by the at least two groups of MOSFETs, each group including at least one MOSFET;
• matching output impedances of the at least two groups of MOSFETs with input impedances of a magnetically insensitive output balun by a magnetically insensitive output matching network;
• converting the amplified balanced signals into an unbalanced format by the magnetically insensitive output balun;
• and
• wherein the amplified balanced signals are blocked by a magnetically insensitive protection circuit from a direct current power supply which provides DC for driving the at least two groups of MOSFETs wherein at least one of the magnetically insensitive input matching network and the magnetically insensitive output match network comprise at least two groups of microstrip lines.

A magnetic resonance imaging system, comprising:

• an apparatus for amplifying a radio-frequency signal, comprising:
• a magnetically insensitive input balun configured to convert the RF signal in unbalanced format into balanced signals;
• at least two groups of MOSFETs, each group including at least one MOSFET configured to respectively amplify the balanced signals;
• a magnetically insensitive output balun configured to convert the amplified balanced signals into an unbalanced format;
• a magnetically insensitive input matching network configured to match input impedances of the at least two groups of MOSFETs with output impedances of the magnetically insensitive input balun;
• at least two splitters configured to divide the balanced signals and supply the divided balanced signals to the magnetically insensitive input matching network;
• a magnetically insensitive output matching network configured to match output impedances of the at least two groups of MOSFETs with input impedances of the magnetically insensitive output balun, and
• a magnetically insensitive protection circuit configured to protect a direct current power supply which provides DC for driving the at least two groups of MOSFETs from the amplified balanced signal wherein at least one of the magnetically insensitive input matching network and the magnetically insensitive output match network comprise at least two groups of microstrip lines.