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Ansoft Designer / Ansys Designer 在线帮助文档：

Designer File Formats >
   Nexxim Netlist Format >
       Names, Numbers, and Constructs >
           Numbers

Numbers

Real numbers in the netlist file can be represented as decimal, exponential, or scaled numbers, or as decibels (exponentially scaled numbers).

A decimal number consists of the numerals 0 through 9, with or without a decimal point, and with or without a leading unary plus or minus: 123, 12.30, +5.0, -20.

An exponential number consists of a decimal number mantissa, the letter e (for “exponent”) and a decimal number exponent. The decimal equivalent is the mantissa multiplied by 10 to the power of the exponent (Table 2).

**Table 2:** **Exponential Number Examples**
Exponential Number	Interpretation	Decimal Equivalent
1e5 or 1e+5	1 × 10⁵	100000
1.0e-5	1.0 × 10^-5 (1/10⁵)	.00001
-5e4	-5 × 10⁴	-50000
-2.05e-4	-2.05 × 10^-4 (-2.05/10⁴)	-.000205

A scaled number consists of a decimal number and an alphabetic token representing a scale factor: 20K, 1.5P, -7.25MEG. Table 3 lists the scale factor tokens and their exponential equivalents.

**Table 3:** **Numeric Scale Factors**
Factor	Interpretation	Exponential Multiplier
ATTO	atto	1e-18
F	femto	1e-15
P	pico	1e-12
N	nano	1e-9
U	micro	1e-6
M	milli	1e-3
K	kilo	1e+3
MEG	mega	1e+6
X	mega	1e+6
G	giga	1e+9
T	tera	1e+12

Note: By default, the single-letter token “A” as a numeric suffix represents amperes (AMP). If the netlist contains the statement .OPTIONS UNIT_ATTO, the single-letter suffix “A” represents
1e-18 (ATTO). In either case, the token AMP (with or without any trailing characters) is interpreted as amperes, and the token ATTO (with or without any trailing characters) is interpreted as 1e-18.

A decibel number uses one of the units DB or DBM. A number (nn in the examples below) with one of these units scales exponentially:

nnDB is scaled as 10 ^ (nn * 0.1).

nnDBM is scaled as 10 ^ (nn * 0.1 − 3).

In both of these examples, the ^ sign denotes exponentiation and the * sign denotes multiplication.

Note: Any extra letters after the DB or DBM prevent a match for DB or DBM (unlike other units, where additional letters are ignored). Here are some examples:

5K = 5000

5KOHM = 5000

5KAPPLES = 5000

5DB = 3.1622777

5DBW = 5

5DBM = 0.0031622777

5DBMW = 5

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