Abstract
An amplifier capable of providing greater than 3 kW into a 50 Omega load is described. The unit, which is of modular construction, operates over the frequency range 1-22 MHz and is designed for a nuclear magnetic resonance imaging experiment. Each module produces up to 800 W peak pulse power for a 5% duty cycle. The module outputs are combined in a five-port hybrid combiner to generate the full output power. Particular attention is paid to the circuitry used to protect the high-power output stages.