High Frequency Switch

Posted on March 6, 2010 by Rend

This is high frequency switch circuit. This circuit uses the 2N4391. When it is off, it will provide a high off-impedance (<0.2pF) and low on-resistance of 30 ohm. Here is the circuit :

High Frequency Switch circuit schematic diagram

This circuit has attenuation > 80dB @ 100 MHz and insertion loss about 6 dB. It can be immediately achieved if we use an “ideal” switch and proper layout. [Source: National Semiconductor Application Note]

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