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Ideal switch in cadence virtuoso

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amr.maghraby

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Hi

I am using cadence virtuoso and i want to make an ideal switch so i tried to use the switch in analogLib the problem is that it is always closed whatever the control voltage may be.
 

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No, it isn't.

You have to respect polarity, this is not anything like a real
relay where enough voltage (current) either way closes
the contact. Make sure "plus" is greater than "minus" voltage
if you intend for a positive applied voltage to close the switch.

It might help you to use a resistor load and voltage sources
to make the goings-on more "instinctive to assess".
 

I already checked for the polarity and it is good.
the control voltage is 5V and the other terminal is grounded.
I dont know where is the problem.
could you please explain it to me in more details
 

amr.maghraby said:
I am using spectre
Click to expand...
Dynamic switch is implemented as Spectre primitive “relay” in Cadence Spectre.
Can you understand this ?

See result of “spectre -h relay”.

Spectre primitive, switch is a Static switch.
See result of “spectre -h switch”.

Show me netlist.
 

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