| 摘要 |
PURPOSE:To easily change a gate bias voltage by adopting the constitution in which the resistance is adjusted so as to change the gate-source voltage of a field effect voltage. CONSTITUTION:One terminal of the secondary winding of a pulse transformer 1 is connected to a capacitor 2 and a gate terminal of the 1st field effect transistor (TR) 6, the other terminal of the capacitor 2 is connected to a source of the 2nd field effect TR 7 and a cathode of a diode, the source of the TR 6 and one terminal of the 1st resistor 4 are connected together, the other terminal of the 1st resistor 4 is connected to the anode of the diode 3 and the drain of the 2nd field effect TR 7 is connected to the one terminal of the 2nd resistor 5. Then the other terminal of the 2nd resistor 5 is connected to a gate of the 3rd field effect TR 8 and the drain of the 1st field effect TR 6 is connected to the source of the 3rd field effect TR 8. Thus, in changing the 1st resistor 4, the gate bias voltage is easily changed. |
