Home > Community > Forums > PCB Design > PSpice A/D accuracy in V16.3?

Email

* Required Fields

Recipients email * (separate multiple addresses with commas)

Your name *

Your email *

Message *

Contact Us

* Required Fields
First Name *

Last Name *

Email *

Company / Institution *

Comments: *

 PSpice A/D accuracy in V16.3? 

Last post Fri, Apr 12 2013 6:59 AM by makeit. 2 replies.
Started by makeit 11 Apr 2013 07:50 AM. Topic has 2 replies and 687 views
Page 1 of 1 (3 items)
Sort Posts:
  • Thu, Apr 11 2013 7:50 AM

    • makeit
    • Not Ranked
    • Joined on Thu, Apr 11 2013
    • Posts 2
    • Points 25
    PSpice A/D accuracy in V16.3? Reply

     Did some simulation with high dynamic range (using a SUM ABM Model : adding a constant value of 1 with a sinus-wave having 120nV as amplitude) . I was supprized getting quantized data with a LSB of 60nV which corresponds to single precision (mantissa hase 23 + 1Bits). Is there any chance to get double precision?

    Here my sim settings:

    ****     OPTION SUMMARY
    ******************************************************************************
      OPTS
    DC ANALYSIS -

        ITL1 =  150
        ITL2 =   20
      RELTOL =    1.0000E-03
      ABSTOL =    1.0000E-12
       VNTOL =    1.0000E-09
        GMIN =    1.0000E-12
    VLTEXPLIMIT =     .5    

    TRANSIENT ANALYSIS -

        ITL4 =   10
    TSTEPDIVFACTOR =    8
      CHGTOL =   10.0000E-15
    DMFACTOR =    1      
    FSTDELFACTOR =    1      

    MISCELLANEOUS -

      NUMDGT =   10
       WIDTH =   80
        DEFL =  100.0000E-06
        DEFW =  100.0000E-06
       DEFAD =    0      
       DEFAS =    0      
        TNOM =   27       

     Thanks!

    • Post Points: 20
  • Thu, Apr 11 2013 9:19 AM

    • oldmouldy
    • Top 10 Contributor
    • Joined on Tue, Jul 15 2008
    • Woking, Surrey
    • Posts 1,454
    • Points 24,710
    Re: PSpice A/D accuracy in V16.3? Reply
    16.6 has 64-bit Probe data format, pretty certain that would be the issue. Not possible before 16.6
    • Post Points: 20
  • Fri, Apr 12 2013 6:59 AM

    • makeit
    • Not Ranked
    • Joined on Thu, Apr 11 2013
    • Posts 2
    • Points 25
    Re: PSpice A/D accuracy in V16.3? Reply

    I did the same simulations with LTspice (V4.11) setting the option NUMDGT = 6 and 7.

    In the first case I get the same result as with PSpice --> single precision.

    With NUMDGT = 7, LTSpice switches his output to double precision.

    Thanks for your answer!

    • Post Points: 5
Page 1 of 1 (3 items)
Sort Posts:
Started by makeit at 11 Apr 2013 07:50 AM. Topic has 2 replies.