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Simulators >> Circuit Simulators >> analog multiplexer for simulation
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Message started by analogue_guy on Aug 18^th, 2009, 12:39am

Title: analog multiplexer for simulation
Post by analogue_guy on Aug 18^th, 2009, 12:39am

Hi,

I am using specre and for a testbench I would need an analog multiplexer, what I can control via a variable setting or any similar handy way.
My goal is basically: I want to change the load of a circuitry in a simple way and I want to edit the testench once, after I just want to set a variable or somethig like that.

I hope you have some idea. Thanks ...

Regards,
--AG

Title: Re: analog multiplexer for simulation
Post by thechopper on Aug 18^th, 2009, 6:23pm

You can easily build one with ideal switches, from the analoglib.
These can be controlled by means of a variable you can set....
The cell is simply called "switch".

Hope this helps
Tosei

Title: Re: analog multiplexer for simulation
Post by analogue_guy on Aug 19^th, 2009, 7:50am

HdrChopper wrote on Aug 18^th, 2009, 6:23pm:

You can easily build one with ideal switches, from the analoglib.
These can be controlled by means of a variable you can set....
The cell is simply called "switch".

Hope this helps
Tosei

Hi,

would be a possibility

Actually I target a Verilog-A solution, then I could simply define one variable and I could even sweep it in simulation.
Simply placing shorts or opens to branches...
But I end up with that in many problems in simulation (convergence ...)

Regards,

Title: Re: analog multiplexer for simulation
Post by thechopper on Aug 19^th, 2009, 3:58pm

Certainly a verilog-A solution is another option.
The convergence problems you are pointing out might be related to the very high impedance on the terminals of your verilogA block.
If you use switches as I suggested you can more easily avoid these problems.

Regards
Tosei