Switching at MHz frequency with a heavy load

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yoyolk

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Hi,

I am kind of looking for or design a switch/relay that can be driven at AC condition with the frequency around 1MHz or a few hundred kHz and the drive voltage is better less than 15V. I have found a relay that can switch at ns. However, since the switch has an internal capacitance around pF, and my load device probably has resistance around 100M ohm. It turns out when I connected my device to that switch, it can only be driven at a few Hz. Can anyone help me?
 

if the relay you are talking about is a mechanical relay ,
no way of switching atkhz , leave alone Mhz.

very few hz .
relays mechtypes, are not meant for that.

your reference to finding a relay that switch at ns , is only switching time (settling).
not the repetitve time.


srizbf
18thmay2010
 

If you want to get useful advice, you will have to give us detailed information about what this mysterious "device" is. The parasitic capacitances, coupled with the "100 M ohm" resistance, will not allow 1 MHz operation.
 

biff44 said:
If you want to get useful advice, you will have to give us detailed information about what this mysterious "device" is. The parasitic capacitances, coupled with the "100 M ohm" resistance, will not allow 1 MHz operation.
Click to expand...

The device I meant here is the Source/Drain terminal of a MOSFET. When the switch is closed, the MOSFET will be turned on and therefore the resistance of the Source/Drain terminal is around tens Ohm. When the switch is open the MOSFET will be turned off and the resistance of the Source/Drain terminal is expected to be around 100M Ohm or even higher. Please let me know if there is anything that is not clear.
 

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