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converting an analog signal into digital and saving the formula on the ADE outputs

TommasoF

Hi all,
I am doing a DC simulation and I desire to display the value of an analog signal as 0 or 1 depending on whether the voltage level is 0 or 1.8V.
In a second step I'll need to do that also for a bus of 4 bits.

The equation I am using is the following: numConv(value(awvAnalog2Digital(v("/lna_wrapper/lna1_cg_bias<0>" ?result "dcOp") nil nil 0.9 nil "centre") 0   ) "dec" t)

where first we convert to digital, pick the value and convert the string to decimal.

This equation works only on the calculator, if I send it to the ADS outputs and I evaluate I get an "eval error" (see below).

In the past I used this functions for a transient simulation and it worked, I wonder why now it doesn't on a simple DC sim.

Does anybody have an idea ? I am using Maestro

thanks 

Tommaso

Parents
  • Andrew Beckett

    Hi Tommaso,

    I'm wondering why you have value() around the A2D call? Since there's no time axis, what are you expecting it to find the value at? Without trying this out with an example, I would expect you just need to miss out the value() call.

    Andrew

Reply
  • Andrew Beckett

    Hi Tommaso,

    I'm wondering why you have value() around the A2D call? Since there's no time axis, what are you expecting it to find the value at? Without trying this out with an example, I would expect you just need to miss out the value() call.

    Andrew

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  • TommasoF
    in reply to Andrew Beckett

    yes, maybe that is part of the problem (or the problem ?) 
    When I plot the signal just converted into digital I get the following plot:

    if I try to convert (see equation below) this signal directly into a number I get an "expression evaluation failed" from the calculator:
    numConv(awvAnalog2Digital(v("/lna_wrapper/lna1_cg_bias<0>" ?result "dcOp") nil nil 0.9 nil "centre") "dec" t)

    So I had to first use the "value":


    value(awvAnalog2Digital(v("/lna_wrapper/lna1_cg_bias<0>" ?result "dcOp") nil nil 0.9 nil "centre")  0   )


    which yield this output on the calculator

    and so then I convert into decimal:

    numConv(value(awvAnalog2Digital(v("/lna_wrapper/lna1_cg_bias<0>" ?result "dcOp") nil nil 0.9 nil "centre")  0   ) "dec" t)

    with this output:

    so all this works on the calculator, but not when I send this expression to the ADE output.

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