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Design >> Analog Design >> High frequency switch - 2N4391
https://designers-guide.org/forum/YaBB.pl?num=1209195670

Message started by liveavr on Apr 26^th, 2008, 12:41am

Title: High frequency switch - 2N4391
Post by liveavr on Apr 26^th, 2008, 12:41am

This circuit uses a 2N4391 JFET to create a high frequency switch. The 2N4391 JFET provides a low on-resistance of 30 ohms and a high off-impedence (<0.2pF) when off. Other specs are: attenuation > 80dB @ 100MHz and insertion loss approximately 6dB. With proper layout and an "ideal" switch, the performance stated above can be readily achieved.