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63 lines
2.1 KiB
63 lines
2.1 KiB
/**********
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Copyright 1990 Regents of the University of California. All rights reserved.
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Author: 1985 Thomas L. Quarles
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**********/
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/*
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*/
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#ifndef ngspice_CONST_H
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#define ngspice_CONST_H
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#define CONSTsqrt2 1.4142135623730950488016887242097
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#define CONSTpi 3.1415926535897932384626433832795
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#define CONSTnap 2.7182818284590452353602874713527
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#define CONSTlog10e 0.43429448190325182765112891891661
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#define CONSTlog2e 1.4426950408889634073599246810019
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/* https://physics.nist.gov/cgi-bin/cuu/Value?c
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* value = 299 792 458 m s-1 (exact) */
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#define CONSTc 299792458
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/* https://www.nist.gov/pml/weights-and-measures/si-units-temperature
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* Note that for general use in an expression, the negative value must
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* be guarded by (), so CONSTKtoC_for_str should only be used for building
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* a string value */
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#define CONSTCtoK 273.15
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#define CONSTKtoC_for_str -CONSTCtoK
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#define CONSTKtoC (CONSTKtoC_for_str)
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/* https://physics.nist.gov/cgi-bin/cuu/Value?e
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* value = 1.602 176 6208 x 10-19 C
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* standard uncertainty = 0.000 000 0098 x 10-19 C */
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#define CHARGE 1.6021766208e-19
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/* https://physics.nist.gov/cgi-bin/cuu/Value?k
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* value = 1.380 648 52 x 10-23 J K-1
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* standard uncertainty = 0.000 000 79 x 10-23 J K-1 */
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#define CONSTboltz 1.38064852e-23
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/* https://physics.nist.gov/cgi-bin/cuu/Value?h
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* value = 6.626 070 040 x 10-34 J s
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* standard uncertainty = 0.000 000 081 x 10-34 J s */
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#define CONSTplanck 6.626070040e-34
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#define CONSTmuZero (4.0 * CONSTpi * 1E-7) /* MuZero H/m */
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/* epsilon zero e0*u0*c*c=1 */
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#define CONSTepsZero (1.0 / (CONSTmuZero * CONSTc * CONSTc)) /* F/m */
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/* This value is not really constant over temperature and frequency, but
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* 3.9 is the most common "all-purpose" value */
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#define CONSTepsrSiO2 3.9
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#define CONSTepsSiO2 (CONSTepsrSiO2 * CONSTepsZero) /* epsilon SiO2 F/m */
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#define REFTEMP (27.0 + CONSTCtoK) /* 27 degrees C in K */
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/* Some global variables defining constant values */
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extern double CONSTroot2;
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extern double CONSTvt0;
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extern double CONSTKoverQ;
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extern double CONSTe;
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#endif /* include guard */
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