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any ideal opamp block? (Read 4458 times)

topquark

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Posts: 61
Thames Valley, UK

any ideal opamp block?
Jan 11^th, 2007, 2:40am

Hello folks,

I am doing a preliminary switched cap block-level simulation. For this I need to build an ideal integrator.
I thought the "opamp" instance from ahdlLib would do the job with a feedback cap.
But, it isn't working ! :-/
Infact, i tried to do an inverting amp with that block(V+=Vdd, V-=gnd!, Vref=?), the tran simulation goes fine but opamp just doesn't work as it should!

Anything I'm missing?
What should I connect to the Vref pin?
Any pointers please?
Thanks,
Gau

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Ken Kundert Global Moderator Offline Posts: 2386 Silicon Valley	Re: any ideal opamp block? Reply #1 - Jan 11^th, 2007, 8:27am You might consider using the ideal opamp model given on the Verilog-AMS page: http://www.designers-guide.org/VerilogAMS/basic-models/ideal-opamp/ideal-opamp.v.... -Ken
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avlsi Community Member Offline Posts: 91 singapore	Re: any ideal opamp block? Reply #2 - Jan 23^rd, 2007, 2:50am Hi , you can use VOtlage controlled VOltage source (VCVS). This is a good way to use ideal opamp. I am using this in my design.
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smarty Community Member Offline Posts: 46	Re: any ideal opamp block? Reply #3 - Apr 24^th, 2007, 9:29am Hi, I think, the ref node in ideal op amp is the Analog ground (kindly correct me if I am wrong). I have used this model from analogLib. eg. Y1 OPAMP2 INP INN OUT AGND Cheers, SBR
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adesign Community Member Offline Posts: 73	Re: any ideal opamp block? Reply #4 - Apr 25^th, 2007, 9:44pm You can give a try with mgcLib available in Design Kits.
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Julian18 Community Member Offline Posts: 55	Re: any ideal opamp block? Reply #5 - Apr 29^th, 2007, 2:08am HI,if u are using hspice, u may just put Eopamp 1 2 OPAMP 3 4 where 1 and 2 is the output port (1:+ 2:- ), while 3 4 is the input port(3:+ 4:- ). make sure u do not mistype the order. Best Regards Julian
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