| 摘要 |
PURPOSE: An overshoot prevention circuit of a pulse modulator for high power amplifier is provided to prevent an amplifier from being damaged and thus generating an error. CONSTITUTION: According to the overshoot prevention circuit(100) of a pulse modulator comprising a MOSFET, an inverter(110) inverts a high/low signal being output from a TTL signal input port(Vttl). A transistor(Q2) is connected to an output port of the inverter through its base, and its collector is connected to a line connected to a drain of the MOSFET from a power supply port(Vdc), and its emitter is connected to a gate of the MOSFET, and thus the transistor passes a remaining current of the MOSFET to a ground by being switched when the high/low signal is output from the inverter. And a diode(D1) prevents a reverse current from being flowed into the MOSFET, and its anode is connected to the front of a node where the transistor is connected, and its cathode is connected to the inverter.
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