Variable capacitance model

[Mircea Gindila]

Hi all,

I am trying to use a variable capacitance model in Cadence, version
4.4.5 but thee model "vccap2 avilable in analogLib is only for
hspiceS simulator and I am using spectreS simulator for my circuit. I
there anyone having a spectreS model for the vccap? As an alternative
I was also thinking of using a verilog-A or VHDL-AMS model, I assume
that should do as well. I know buiding such a model it should be
fairly simple but if sombody have used one that it works that would
save me important time.

Many thanks,

Mircea

 

[Andrew Beckett]

Note you can do this with a "bsource" component in IC5033 or later.
It allows you to have arbitrary expressions on capacitors or bsource
components (spectre -h bsource for more details).

Also, you can use vccs in analogLib as a vccap from IC5033 onwards
(essentially similar to hspice's component).

Regards,

Andrew.

On 1 Jun 2004 07:09:02 -0700, mvg00r@ecs.soton.ac.uk (Mircea Gindila) wrote:

Hi all,

I am trying to use a variable capacitance model in Cadence, version
4.4.5 but thee model "vccap2 avilable in analogLib is only for
hspiceS simulator and I am using spectreS simulator for my circuit. I
there anyone having a spectreS model for the vccap? As an alternative
I was also thinking of using a verilog-A or VHDL-AMS model, I assume
that should do as well. I know buiding such a model it should be
fairly simple but if sombody have used one that it works that would
save me important time.

Many thanks,

Mircea

--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd