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Simulators >> RF Simulators >> parameterized Simulation with CADENCE ADE
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Message started by RadioFreeq on Dec 14^th, 2007, 1:00am

Title: parameterized Simulation with CADENCE ADE
Post by RadioFreeq on Dec 14^th, 2007, 1:00am

Hi there,

I´m simulating 1 BAW-Filter composed of many BAW-Resonators in a Ladder structure. I have an accurate Model for the BAW-Resonator for Which you have 4 Parameter to change, lets say P1,P2,P3 and P4. depending on these Parameters the values for the components of the model can be calculated. so there must be internal functions in the Model-schematic that calculate the values for each component of this Model when the 4 Parameter are Input. The Filter is Composed of 3 Stages of series-parallel Resonators with different Parameter value for each stage. I don´t know how to implement this in CADENCE. I need something like: I input the 4 Parameter for each Resonator in the Filter Structure and internally the values for each model are calculated and then I simulate and optimize. there is only 1 Model for Resonator. So it´s like having a Resistor (example) and you change its value each time you use an instance of it, but in my Problem you give 4 values and internal values will be computed.

S.O.S

Title: Re: parameterized Simulation with CADENCE ADE
Post by RadioFreeq on Dec 14^th, 2007, 1:30am

I found something with pPar, but I need to implement a function in the schematic which calculates some intermediate valus that serves calculating the values for the model components..

Title: Re: parameterized Simulation with CADENCE ADE
Post by sheldon on Dec 15^th, 2007, 6:52am

Radio,

Here are a some things that I have used to parameterize a design,

1) You can create parameterized schematics for blocks using pPar,
for example, create a biquad section and parameterize the R and C
in terms the natural frequency and Q. When the multiple biquads
are cascaded, the frequency and the Q of each section can be
optimized to give the best overall transfer function.

2) Instead of using fixed values for instance parameters, you can use
equations, for example, define the frequency of a source as
(tone/numPoints)*fsample. In this case the source is used as the
input signal for an ADC, the frequency is automatically calculated
based on the design variables set by the designer.

3) As an alternate to #2, you could create dummy design variables and
do the calculation using dummy variables.

So I would create a parameterized schematic using pPar for the BAW
element using the parameters P1, P2, P3, and P4. Then I would create the
overall schematic, 3 stages of series-parallel resonators and use design
variables for the instance values. Then you can do parametric sweeps or
any other analysis you would like.

Best Regards,

Sheldon