SSR, EMR
SSR, EMR
(OP)
Hi
I’m trying to create a capacitor switching circuit using a bank of SSR's as the switching component. The signal is at 13.56Mhz. The problem I’m having is that the output capacitance of the SSR's is too high. There’s 8 of these devices in a row which when all turned off are creating a minimum capacitance of about 120pf. The spec is of course a lot lower so I’m assuming the frequency is causing the devices to have a higher output capacity? Would I be correct? I can get around the problem by replacing them with reed EMR's but ideally I would have SSR's as they are generally cheaper and would result in a smaller circuit. Is there any way to reduce the output capacitance or am I going to have to use EMR's to solve the solution?
Thanks
I’m trying to create a capacitor switching circuit using a bank of SSR's as the switching component. The signal is at 13.56Mhz. The problem I’m having is that the output capacitance of the SSR's is too high. There’s 8 of these devices in a row which when all turned off are creating a minimum capacitance of about 120pf. The spec is of course a lot lower so I’m assuming the frequency is causing the devices to have a higher output capacity? Would I be correct? I can get around the problem by replacing them with reed EMR's but ideally I would have SSR's as they are generally cheaper and would result in a smaller circuit. Is there any way to reduce the output capacitance or am I going to have to use EMR's to solve the solution?
Thanks





RE: SSR, EMR
RE: SSR, EMR
RE: SSR, EMR
Is the 13.56 MHz the 'switched' signal or the 'switching' signal?
RE: SSR, EMR
RE: SSR, EMR
13.56 MHz is "RF", and I don't recall seeing SSRs being used to switch RF. There are many technologies that can be used to switch RF, reed relays will work just fine carrying low power HF frequencies - if that's the approach that works best for your application.
RE: SSR, EMR
What is driving the switch?
Keith Cress
kcress - http://www.flaminsystems.com
RE: SSR, EMR
http://uk.rs-online.com/web/p/reed-relays/6220799/
Which I think will probibly do exactly the same thing. The circuit is low power so should be fine and I can reduce the EMF in other ways.
Cheers for your help anyway