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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****************************************************************************** OPTSDC ANALYSIS - ITL1 = 150 ITL2 = 20 RELTOL = 1.0000E-03 ABSTOL = 1.0000E-12 VNTOL = 1.0000E-09 GMIN = 1.0000E-12VLTEXPLIMIT = .5 TRANSIENT ANALYSIS - ITL4 = 10TSTEPDIVFACTOR = 8 CHGTOL = 10.0000E-15DMFACTOR = 1 FSTDELFACTOR = 1 MISCELLANEOUS - NUMDGT = 10 WIDTH = 80 DEFL = 100.0000E-06 DEFW = 100.0000E-06 DEFAD = 0 DEFAS = 0 TNOM = 27
In reply to oldmouldy:
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!