RF switches occupy many roles in MRI RF systems, including spoiling, damping, transmit/receive (T/R) switches, digital tuners, and crossbar switches. For high field MRI, PIN diodes are the switching device of choice, but at low field strength FETs are attractive. However, implementing the typical drive circuitry for the switch is difficult at lower frequencies. Here we describe a novel drive circuit suitable for a broad frequency range. It does not rely on any ferrous materials, or any high frequency oscillating circuits, and is thus suitable for use on the coil.
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