posy c1,p1 c2,p2 ... posy c1,p1 c2,p2 ... args
Defines a transfer function by a one dimensional ``posynomial'', like a polynomial, except that the powers are arbitrary, and usually non-integer.
There is no corresponding capability in any SPICE that I know of.
For capacitors, this function defines charge as a function of voltage. For inductors, it defines flux as a function of current.
For fixed sources, it defines voltage or current as a function of time.
Normal use of this function required positive input (voltage or current). The result is zero if the input is negative. Raising a negative number to a non-integer power would produce a complex result, which implies a non-causal result, which cannot be represented in a traditional transient analysis.
The transfer function is defined by:
if (in >= 0){
out = (c1*in^p1) + (c2*in^p2) + ....
}else{
out = 0.
}
| min | Minimum output value (clipping). (Default = -infinity) |
| max | Maximum output value (clipping). (Default = infinity) |
| abs | Absolute value, truth value. (Default = false). If set to true, the result will be always positive. |
| odd | Make odd function, truth value. (Default = false). If set to true, negative values of x will be evaluated as out = -f(-x), giving odd symmetry. |
| even | Make even function, truth value. (Default = false). If set to true, negative values of x will be evaluated as out = f(-x), giving even symmetry. |
E1 (2 0 1 0) posy(1 .5)
The output of E1 is the square root of its input.