| 摘要 |
PURPOSE:To constitute a circuit capable of switching large currents at high speed simply by organizing the circuit of an input signal conversion circuit, a waveform shaping circuit and a current drive circuit. CONSTITUTION:When a signal at a TTL level is transmitted over an input terminal VIN, the signal is level-shifted by Schottky diodes D1-D3 for an input signal conversion circuit, and enters an MESFET Tr4 for a waveform shaping circuit as a BFL signal. Since MESFETs Tr3 and Tr4 for the waveform shaping circuit construct an inverter circuit, a signal where a high level and a low level are inverted to a signal transmitted over the gate for the MESFET Tr4 enters a gate for an MESFET Tr5. The signal transmitted over the gate for the MESFET Tr5 is level-shifted by Schottky diodes D4-D6, and brought to a voltage level capable of switching an MESFET Tr7 for a current drive circuit. The switching times of ON-OFF of an MESFET Tr8 are all brought to approxi mately 1nS by such an input signal conversion circuit. |
