The power amplifier operating in a low frequency with high output power is always the hot issue in the sonar transmitter system in underwater acoustic field. This paper provides a Class D power amplifier for a transmitter in a sonar system. We first describe the basic principles of power amplifiers. Then we give the details when designing and fabricating a switched Class D power amplifier. Lastly the test results are offered. As a result of measurement, the power amplifier can operate in a center frequency of 100 kHz with a bandwidth of 5 kHz, a 760W output power.
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