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How to Calculate Hysteresis using OCEAN/SKILL script

KishoreGunturi

I am trying to write a code that calculates the hysteresis window for my Schmitt trigger /comparator. When I try to get the expression through calculator and "intersect" function it gives a wavefrom and I am not sure how to obtain the co-ordinates fo the waveform. If I can obtain a list/co ordinates I can calculate the hysteresis by just sobtracting the two x-coordinates. I am struggling with this waveform object for a long time and not able to figure out the way. It happens with many functions of calculator that you will end up with waveform whose co-ordinates are not available in list form. Please let me know how to obtain this wave co crdinates in number format lists or something on which I can do some mathmatical processing.

Parents

  • This might  help:

    /* abWaveToList.il

Author     A.D.Beckett
Group      Custom IC (UK), Cadence Design Systems Ltd.
Language   SKILL
Date       Nov 17, 2003 
Modified   
By         

Convert a waveform to a list

***************************************************

SCCS Info: @(#) abWaveToList.il 11/17/03.15:08:15 1.1

*/

/************************************************************************
*                                                                       *
*                  (abWaveToList wave @key transpose)                   *
*                                                                       *
*    Take a waveform object, and return it as a list of xy pairs. Or    *
* if transpose is set, it returns a list of x values followed by a list *
*                             of y values.                              *
*                                                                       *
************************************************************************/

(procedure (abWaveToList wave @key transpose)
  (let (xList yList xyList len
	(xVec (drGetWaveformXVec wave))
	(yVec (drGetWaveformYVec wave))
	)
       (setq len (drVectorLength xVec))
       ;-----------------------------------------------------------------
       ; Return value of this if is the list
       ;-----------------------------------------------------------------
       (if transpose
	   (progn
	    (for i 0 (sub1 len)
		 (setq xList (tconc xList (drGetElem xVec i)))
		 (setq yList (tconc yList (drGetElem yVec i)))
		 )
	    (list (car xList) (car yList))
	    )
	   ; else
	   (progn
	    (for i 0 (sub1 len)
		 (setq xyList (tconc xyList (list (drGetElem xVec i)
						  (drGetElem yVec i))))
		 )
	    (car xyList)
	    )
	   ) ; if
       ) ; let
  ) ; procedure 

     

Reply

  • This might  help:

    /* abWaveToList.il

Author     A.D.Beckett
Group      Custom IC (UK), Cadence Design Systems Ltd.
Language   SKILL
Date       Nov 17, 2003 
Modified   
By         

Convert a waveform to a list

***************************************************

SCCS Info: @(#) abWaveToList.il 11/17/03.15:08:15 1.1

*/

/************************************************************************
*                                                                       *
*                  (abWaveToList wave @key transpose)                   *
*                                                                       *
*    Take a waveform object, and return it as a list of xy pairs. Or    *
* if transpose is set, it returns a list of x values followed by a list *
*                             of y values.                              *
*                                                                       *
************************************************************************/

(procedure (abWaveToList wave @key transpose)
  (let (xList yList xyList len
	(xVec (drGetWaveformXVec wave))
	(yVec (drGetWaveformYVec wave))
	)
       (setq len (drVectorLength xVec))
       ;-----------------------------------------------------------------
       ; Return value of this if is the list
       ;-----------------------------------------------------------------
       (if transpose
	   (progn
	    (for i 0 (sub1 len)
		 (setq xList (tconc xList (drGetElem xVec i)))
		 (setq yList (tconc yList (drGetElem yVec i)))
		 )
	    (list (car xList) (car yList))
	    )
	   ; else
	   (progn
	    (for i 0 (sub1 len)
		 (setq xyList (tconc xyList (list (drGetElem xVec i)
						  (drGetElem yVec i))))
		 )
	    (car xyList)
	    )
	   ) ; if
       ) ; let
  ) ; procedure 

     

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