first working pcell
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MMIC Praktikum
commit
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266
inductor_2
Normal file
266
inductor_2
Normal file
@ -0,0 +1,266 @@
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(defMathConstants 'mconst)
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mfgGrid = 100.0
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debug = nil
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; SNAPS STUFF TO GRID
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; uses global mfgGrid to do so, which gets redefined in generator
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; to the tech mfg grid using the techFile
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(defun snap (p)
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floor(p*mfgGrid)/mfgGrid
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)
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; DEBUG output function, uncomment to get all output
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(procedure output( @rest args)
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(when debug (apply 'printf args))
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;()
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)
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; VECTOR HELPER FUNCTIONS
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; add a vector vect to a point p
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(defun addVect (p vect)
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(car(p)+car(vect)):(cadr(p)+cadr(vect))
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)
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; multiplies a vector vect with a scalar
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(defun multVect (vect scalar)
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(car(vect)*scalar):(cadr(vect)*scalar)
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)
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; multiplies a vector vect with -1 (inverse)
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(defun invVect (vect)
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(multVect vect -1)
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)
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; subtracts two vectors from one another
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; (does vect2 - vect1)
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(defun subVect (vect1 vect2)
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(car(vect2)-car(vect1)):(cadr(vect2)-cadr(vect1))
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)
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; returns length of a vector
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(defun lenVect (vect)
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sqrt((1.0*car(vect)**2)+(1.0*cadr(vect)**2))
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)
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; rotates a vector vect by 90 CCW
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(defun rotVect (vect)
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cadr(vect):-car(vect)
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)
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; normalizes a vector vect by its length
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(defun normalizeVect (vect)
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(multVect vect 1.0/(lenVect vect))
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)
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; DRAWING HELPER FUNCTIONS
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; creates a pin using database functions
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; and a corresponding net with name name
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; does so on the layer layer
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(defun ind_createPin (id name points layer)
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(leCreatePin
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id
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layer
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"polygon"
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points
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name
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"inputOutput"
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'("none")
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)
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/*
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net = dbCreateNet(id name)
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fig = dbCreatePolygon(id layer points)
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trm = dbCreateTerm(net name "inputOutput")
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pin = dbCreatePin(net fig name trm)
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pin~>accessDir = '( "none" )
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*/
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lab = dbCreateLabel(id '("TEXT") cadr(points) name "centerLeft" "R0" "roman" 3)
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;output("created pin %s\n", name)
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)
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; Creates the end connection for the inductor and
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; places a pin there
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; TODO: create underpass here
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(defun ind_createEnd (id start w dir)
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(output "[createEnd] start=%P dir=%P\n", start, dir)
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(let
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(center points left right up)
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center = (addVect start (multVect dir (snap -w/2)))
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left = (addVect center (multVect dir (snap -w/2)))
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right = (addVect center (multVect dir (snap w/2)))
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up = (multVect (rotVect dir) (snap w/2))
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points = list(
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(addVect left up)
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(addVect right up)
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(addVect right (invVect up))
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(addVect left (invVect up))
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)
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(ind_createPin
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id
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"inner"
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points
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list("TopMetal2" "drawing")
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)
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)
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)
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; Creates the start of the inductor
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; and places a pin there
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(defun ind_createStart (id start width dir)
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center = start; (addVect start multVect((invVect dir) width/2))
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points = list(
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(addVect center (-width):width)
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(addVect center width:width)
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(addVect center width:(-width))
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(addVect center (-width):(-width))
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)
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(ind_createPin
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id
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"outer"
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points
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list("TopMetal2" "drawing")
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)
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)
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; creates one segment of the inductor and calls itself recursively to complete
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; one inductor
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(defun ind_drawSegment (id n seg start r)
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dx = snap(r*talpha)
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(case mod(seg, 8)
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(0
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end = dx:r
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)
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(1
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end = r:dx
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)
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(2
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end = r:-dx
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)
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(3
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end = dx:-r
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)
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(4
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end = -dx:-r
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)
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(5
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end = -r:-dx
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)
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(6
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end = -r:dx
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)
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(7
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r -= pitch
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end = (addVect start (r-dx):(r-dx))
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)
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)
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dir = (subVect start end)
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ndir = (normalizeVect dir)
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isstart = (seg == 0)
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isend = (n < 1)
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; DEBUG
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output("seg: %d, n: %L (start: %L, end: %L)\n", mod(seg, nseg), n, isstart, isend)
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when(isend
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l = (lenVect dir)
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if((mod(seg,2)==0)
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then
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end = addVect(end multVect(ndir (snap l*(n-1))))
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else
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end = addVect(start multVect(ndir (snap l*(n-1))))
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)
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)
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if((mod(seg, 2) == 0)
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then
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(dbCreatePathSeg
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id
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inductorLayer
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start
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end
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w
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if(!isstart then "custom" else "extend")
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if(!isend then "custom" else "truncate")
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list(if(isstart then 0 else whalv) if(isend then 0 else whalv) list(w2halv w2halv whalv w2halv w2halv whalv))
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)
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else
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(dbCreatePathSeg
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id
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inductorLayer
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start
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end
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w2
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"truncate"
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"truncate"
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)
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)
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when(isstart ind_createStart(id start whalv ndir))
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when((n<=1) ind_createEnd(id end whalv ndir))
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n -= 1
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(output "n=%L\n", n)
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(when (n > 0)
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(ind_drawSegment id n seg+1 end r)
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) ; when
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)
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; uses ind_drawSegment to create a complete inductor with
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; the given specification
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defun(drawInductor (n r width pitch)
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; the PCell cell view id
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id = pcCellView
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(when (not id)
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(error "could not find cell view")
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) ; when
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; get manufacturing grid spacing and set global accordingly
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mfgGrid=1/techGetMfgGridResolution(techGetTechFile(id))
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(output "using manufacturing grid of %L\n", mfgGrid)
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; set multiple globals
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inductorLayer = '("TopMetal2", "drawing")
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output("generating inductor with r=%L, turns=%L, pitch=%L and width=%L\n" r n pitch width)
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whalv = snap(width/2)
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w = whalv*2
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; diagonal segment width
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w2halv = snap(width*sqrt(2)/2)
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w2 = 2*w2halv
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pitch = snap(pitch + w) ; pitch from segment sides
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r = snap(r - whalv) ; middle radius
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nseg = 8 ; octagonal inductor
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; calculation globals
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ahalv = mconst.PI/nseg ; angle between segments
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talpha = tan(ahalv)
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hl = snap((r-w/2)*talpha) ; start point
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; draw inductor
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(ind_drawSegment id n*nseg 0 -hl:r r)
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)
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; defines the inductor PCell
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(pcDefinePCell
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list( (ddGetObj "mmic14_inductors") "inductorPcell" "layout")
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list(
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( turns "float" 1.0 )
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( radius "float" 100.0 )
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( width "float" 2.1 ); techGetSpacingRule(techGetTechFile(pcCellView) "minWidth" "TopMetal2" ))
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( pitch "float" 2.1 )
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)
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(let
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()
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drawInductor(turns radius width pitch)
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)
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)
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