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Switch model in ADC sim (Read 10247 times)
maserati
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Switch model in ADC sim
Jan 26th, 2005, 4:34pm
 
I am designing  a SAR (successive appox. register) ADC, and I want to model and simulate the circuit with some ideal components first.
Which cell should I use from analogLib? I tried to use "vcres" to sim, but it cannot edit its properties.
I was using Cadence 5.0.3.3
by the way, I found Cadence 5.1.4.1 lacks of "vcres" properties file either.  I'm wondering if there is a bug from Cadence.

So, which components should I use to model a ideal switch?
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codec
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Re: Switch model in ADC sim
Reply #1 - Jan 28th, 2005, 8:30pm
 
Hi, Maserati
You can use 'Relay' in analogLib. It is similar to Gxxx in HSPICE.
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sheldon
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Re: Switch model in ADC sim
Reply #2 - Mar 7th, 2005, 6:57pm
 
Greetings,

  If you have access to  AMS Designer, there is a switch behavioral model
in bmslib. IThe switch is modeled as a variable reisistance and  in general
performs well in simulations, i.e., the transfer function is smooth and
continuous.

                                                                                Best Regards,

                                                                                  Sheldon
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Andrew Beckett
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Re: Switch model in ADC sim
Reply #3 - Mar 8th, 2005, 1:22am
 
A reply to the orginal post. vcres is only for HSPICE, if my memory serves. It always has been. You're probably not seeing the parameters as I think it doesn't show hspice-related parameters by defaults (use Options->Parameter Filter or whatever the menu is called in the schematic editor).

You should be able to use vccs in recent versions as a voltage controlled resistor in spectre - or you can use relay as suggested.

Andrew.
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