Hi everybody,

I am on a project where I have to switch between different filters for different frequencies. Now, the solution I have not to alter the signal, is to put/remove a sort of jumper. However, I was thinking about replacing the 'manual' jumper by a 4066 analog switch, but I am just afraid that the signal will be filtered / altered by this chip. I am working in UHF (300-400MHz) and I cannot find any info related to the frequency.

What do you think ?

Thanks

EDIT;
I finally found a better datasheet, but it looks like it is not suitable for UHF. Actually, I am deducing it, because the typical frequencies are around 10MHz.
Does it exist such a switch for high frequencies ?

 

Hello,

Take a look at the ksw246 from mcl.
That is a analog switch that works from DC to 4600 Mhz.
See the datasheet for more info.

Bertus

 

There is another alternative. You could use PIN diodes. These are used as switches by biasing them off or on. You isolate the DC to the diodes with capacitors and keep the RF out of the DC circuit with chokes. Your reverse bias voltage must be greater than your peak signal voltage and your forward bias current must be greater than your peak signal current.

 

Cool, it is a cheaper way of doing what I want. I checked the RF switches are pretty expensive.
I didn't know these PIN diode. I found this for those who are interested : http://www.microwaves101.com/encyclopedia/diodes_PIN.cfm

Thank you