| 摘要 |
PURPOSE:To reduce the series equivalent input capacitance at switched end, by restricting the drain capacitance of the field effect transistor with the capacitance of the diode constituting the diode bridge. CONSTITUTION:Pulsive drive voltage applied via the capacitors 6, 7 is rectified and smoothed with the diode 10 and the resistor 12 to make conductive the field effect transistor 1. The field effect transistor 1 is mounted in the bridge consisting of the diodes 13-16 to turn on and off the bidirectional signal. When the transistor 1 is OFF, the cross points 17, 18 of the transistor 1 and the diodes are DC-biased to a given point to the switched AC input signal of a constant amplitude, and the drain capacitance of the transistor 1 is not operated to the signal more than a given point. As a result, the series equivalent resistor of the switch is only the capacitance of the diodes. Accordingly, the switching performance to high frequency signal is increased. |
