IQmath Library

IQNabs
Absolute value of IQ number
Description
This intrinsic calculates the absolute value of an IQ number:
Declaration
Global IQ function (IQ format = GLOBAL_Q)
_iq _IQabs(_iq A)
Q format specific IQ function (IQ format = IQ1 to IQ30)
_iqN _IQNabs( _iqN A)
Input Format
Global IQ function (IQ format = GLOBAL_Q)
IQ number in GLOBAL_Q format
Q format specific IQ function (IQ format = IQ1 to IQ30)
IQ number in IQN format
Output Format
Global IQ function (IQ format = GLOBAL_Q)
Absolute value of input in GLOBAL_Q format
Q format specific IQ function (IQ format = IQ1 to IQ30)
Absolute value of input in IQN format
Usage
Example:
Calculate the absolute sum of three IQ numbers (GLOBAL_Q=IQ28)
_iq xin1, xin2, xin3, xsum;
_iq20 yin1, yin2, yin3, ysum;
xsum = _IQabs(X0) + _IQabs(X1) + _IQabs(X2);
xsum = _IQ28abs(X0) + _IQ28abs(X1) + _IQ28abs(X2);
©Texas Instruments Inc., June 2002 63