High speed switching circuit composed of the SW-239

Published:2011/9/4 20:44:00 Author:TaoXi | Keyword: High speed, switching circuit | From:SeekIC

The High speed switching circuit composed of the SW-239 is as shown in the figure. This kind of circuit uses the high speed switch SW-239, and it switches the pathes of a few MHZ to several hundred megahertz high frequency signals. The switching speed is decided by the optocoupler PC9DlO. The SW-239 has the 50Ω resistance, the RFcircuit isalways in the open-circuit state before and after the switching, so it has very low coupling to the switch and the surround circuit, the switch conduction and the deadline isolation degree are very high. So when the circuit is switching, it will not produce the peak voltage pulse. RP1 can be used to adjust the gain (before and after the switching).



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