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Can anyone suggest a switch for me ?

Hi, I will have 4 inputs, all will be 10 kHz sine waves (perhaps very noisy) and I want to connect a measuring instrument to each in turn.

This is to go into a vector network analyser I am designing. I have not sat down carefully and worked out what the limiting item on performance will be, but I suspect I will need 60 dB isolation to prevent this section limiting performance. So if I am measuring input 2, the contribution from inputs 1, 2 and 4 should be at least 60 dB down on that from port 2.

Reply to
Dave
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I should have added I would rather soemthing that can be switched electronically (not relays), but perhaps relays are the only way.

Maximum signal will be 1V peak. minimum might be a few uV.

Reply to
Dave

Since you didn't say anything about needing to switch quickly, I'll assume slow is ok. If you use CD4016 chips arranged like the below, the cross talk will be determined more by the layout than the devices.

U1A U2A CH1 ------o\\----+-------o\\-------+------ To output ! ! o ! / U1B ! ! ! GND ! U3A U2B ! CH2 ------o\\----+-------o\\-------+ ! ! o ! / U3B ! ! ! GND ! more channels

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kensmith@rahul.net   forging knowledge
Reply to
Ken Smith

As your guessed, speed it not critical. I'll take a look at thw data on that chip.

Reply to
Dave

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