ASITIC Documentation: Creation

Balun: Create a Symmetric Balun

Aliases: balun,b,balunt,symt

Summary: Create a symmetric planar transformer of specifieddimensions. The center tap of the primary and secondary can thus belocated and used to build baluns. At the completion of the commandtwo spirals will reside in memory, the primary and the secondaryspiral, forming a 6-port circuit.

Example:

Balun name=a:len=250:w1=10:w2=15:s=5:n=5:metal=m5:metal2=m4 

• Name : NAME --The unique name of the spiral.

• Outer Dimension L : LEN --The outer dimensions in microns of the spiral measured from edge to edge.
• Primary Metal Width : W1 --The metal trace width in microns.

• Secondary Metal Width : W2 (optional) --The metal trace width in microns.

• Spacing : S --The spacing from metal edge to metal edge.

• Turns : N --The number of spiral turns. Fractional amounts divisible by .25can be used to specify partial turns. The turns must not exceedthe upper limit.

• Metal Layer : METAL --The metal layer to use to wind the spirals.

• Transition Metal Layer : METAL2 --The metal layer to use to make transitions to inner turns.

• Origin of Spiral : XORG : YORG (optional) --The physical origin of the spiral relative to the lower lefthand corner of the chip. The origin of the spiral is the lowerleft corner rather than the physical center of the spiral. Donot place the spiral outside of the chip boundary, and avoidabutting the spiral against the chip boundaries.

• Orientation : ORIENT --The orientation of the spiral relative to the x-axis. Angles arespecified in units of degrees and the counter-clockwisedirection is considered positive.

Capacitor: Create Metal-Insulator-Metal Capacitor

Aliases: capacitor,captor,ccap

Mmsquare: Create a Multi-Metal Series Connected Square Spiral

Aliases: mmsquare,mmsq,sqmm,rectmm

Summary: Create a multi-metal series connected square spiral of specifieddimensions and place the spiral in memory. The spirals are wound insuch a way that the magnetic field of each layer adds to the totalmagnetic field so as to increase the inductance of the overallstructure. Thus, for a two layer structure, the inductance willincrease to L1+L2+2*M12 where M12 is the mutual inductance. Agraphical representation of the spiral should appear at the completionof the command.

Example:

(A three layer spiral on M5 - M3) SQMM NAME=A:LEN=150:W=8:S=2:N=5:METAL=M5:EXIT=M3:XORG=200:YORG=2 
 

• Name : NAME --The unique name of the spiral.

• Outer Dimension : LEN : ILEN --The outer dimension in microns of the spiral measured from edgeto edge. Note: If you enter "-1" for the dimension you will beprompted for the inner dimension of the spiral.

• Metal Width : W --The metal trace width in microns.

• Spacing : S --The spacing from metal edge to metal edge.

• Turns : N --The number of spiral turns. Fractional amounts divisible by .25can be used to specify partial turns. If you specify the outerdimensions of the spiral, then the turns must not exceed theupper limit.

• Metal Layer : METAL --The metal layer to use to wind the spiral.

• Exit Metal Layer : EXIT --This is the last layer of the spiral. Spirals will be created oneach metal layer in between METAL and EXIT.

• Origin of Spiral : XORG : YORG --The physical origin of the spiral relative to the lower lefthand corner of the chip. The origin of the spiral is the lowerleft corner rather than the physical center of the spiral. Donot place the spiral outside of the chip boundary, and avoidabutting the spiral against the chip boundaries.

• Orientation : ORIENT --The orientation of the spiral relative to the x-axis. Angles arespecified in units of degrees and the counter-clockwisedirection is considered positive.

Ring: Create Polygon Ring

Aliases: ring,halo,circle,circ

Example:

ring name=halo:rad=100:w=10:gap=30:metal=msub:xorg=200:yorg=200

If no arguments are supplied, you will be prompted for the ring data. The input parameters are as follows:

• Name : NAME -- The unique name of the spiral.

• Radius : RAD -- The radius in microns of the spiral measured from outer edge to edge.

• Metal Width : W -- The metal trace width in microns.

• Gap Angle : GAP -- Angle of gap in degrees. For instance, 90degrees will create a `ring' spanning 270 degrees.

Shuntsquare: Create a Multi-Metal Shunt Connected (Stacked) Square Spiral

Aliases: shuntsquare,shsq,sqsh,shuntsq

Spiral: Create a Polygon Spiral

Aliases: spiral,sp,spi,s

Summary: Create a polygon spiral of specified dimensions and place the spiral in memory. A graphical representation of the spiral should appear at the completion of the command.

Example:

SP NAME=X:RADIUS=100:SIDES=32:W=8:S=3:N=5:METAL=M3:XORG=150:YORG=150 

• Name : NAME -- The unique name of the spiral.

• Radius : RADIUS -- The radius of the spiral measured from the center of the spiral to the outer edge of the spiral. The value the radius of the smallest circle that contains the spiral.

Square: Create a Square Spiral

Aliases: square,sq,sqr,rect

Summary: Create a square or rectangular spiral of specified dimensions and place the spiral in memory. A graphical representation of the spiral should appear at the completion of the command.

Example:

SQ NAME=A:LEN=170:W=10:S=3:N=4.75:METAL=M3:EXIT=M2:XORG=200:YORG=200

• Name : NAME -- The unique name of the spiral.

• Outer Dimension : LEN : ILEN -- The outer dimension in microns of the spiral measured from edge to edge. Note: If you enter "-1" for the dimension you will be prompted for the inner dimension of the spiral.

• Metal Width : W -- The metal trace width in microns.

• Spacing : S -- The spacing from metal edge to metal edge.

• Turns : N -- The number of spiral turns. Fractional amounts divisible by .25 can be used to specify partial turns. If you specify the outer dimensions of the spiral, then the turns must not exceed the upper limit.

• Metal Layer : METAL -- The metal layer to use to wind the spiral.

• Exit Metal Layer : EXIT -- An exit metal segment is used to provide a connection to the inner port of the spiral. A different metal layer must be use to avoid shorting the spiral. The exit layer is constructed to continue the last turn of the spiral. In other words, it is in the direction of the last segment of the spiral. To place the exit layer in another direction, do not use an exit layer but use the WIRE command.

• Origin of Spiral : XORG : YORG -- The physical origin of the spiral relative to the lower left hand corner of the chip. The origin of the spiral is the lower left corner rather than the physical center of the spiral. Do not place the spiral outside of the chip boundary, and avoid abutting the spiral against the chip boundaries.

• Orientation : ORIENT -- The orientation of the spiral relative to the x-axis. Angles are specified in units of degrees and the counter-clockwise direction is considered positive.

Squaretaper: Create a Tapered Square Spiral

Aliases: squaretaper,sqtaper,tapersq,sqt

Summary: The square taper spiral has constant spacing but the metalwidth is tapered continuously in a linear fashion. The first segmentis wound with a metal width of <W0> and the final turn with metalwidth <W1>. For every other segment i, W(i) = W0 + (W1-W0)*i/(4*N).

Example:

sqt name=taper:len=200:w0=20:w1=5:s=3:n=5:metal=m5

If no arguments are supplied, you will be prompted for the spiral data. The input parameters are as follows:

• Name : NAME -- The unique name of the spiral.

• Outer Dimension : LEN : ILEN -- The outer dimension in microns of the spiral measured from edge to edge. Note: If you enter "-1" for the dimension you will be prompted for the inner dimension of the spiral.

• Initial Metal Width : W0 -- The initial metal trace width in microns.

• Final Metal Width : W1 -- The final metal trace width in microns.

• Spacing : S -- The spacing from metal edge to metal edge.

• Turns : N -- The number of spiral turns. Fractional amounts divisible by .25 can be used to specify partial turns. If you specify the outer dimensions of the spiral, then the turns must not exceed the upper limit.

• Metal Layer : METAL -- The metal layer to use to wind the spiral.

• Exit Metal Layer : EXIT -- An exit metal segment is used to provide a connection to the inner port of the spiral. A different metal layer must be use to avoid shorting the spiral. The exit layer is constructed to continue the last turn of the spiral. In other words, it is in the direction of the last segment of the spiral. To place the exit layer in another direction, do not use an exit layer but use the WIRE command. (Currently ignored)

• Origin of Spiral : XORG : YORG -- The physical origin of the spiral relative to the lower left hand corner of the chip. The origin of the spiral is the lower left corner rather than the physical center of the spiral. Do not place the spiral outside of the chip boundary, and avoid abutting the spiral against the chip boundaries.

• Orientation : ORIENT -- The orientation of the spiral relative to the x-axis. Angles are specified in units of degrees and the counter-clockwise direction is considered positive.

Sympoly: Create a Polygon Symmetric Spiral

Aliases: sympoly,balpoly,centerpoly,symsp

Summary: Create a polygon symmetric spiral of specified dimensions and place the spiral in memory. A graphical representation of the spiral should appear at the completion of the command. This spiral will have both ports on the outside and the spiral impedance should be fairly symmetric, i.e. both ports should present the same impedance. This is accomplished by winding the spirals symmetrically from turn to turn. Thus the center of this spiral, accessible from the inside of the structure, represents the true center "tap" of inductance and resistance. This structure is the building block for designing polygon baluns as well.

Example:

SYMPOLY NAME=D:RAD=80:W=10:S=4:ILEN=14:N=5:METAL=M3:METAL2=M2:XORG=200:YORG=200 

• Name : NAME -- The unique name of the spiral.

• Radius : RAD --The outer dimension in microns of the spiral measured from edge to edge.

• Metal Width : W --The metal trace width in microns.

• Spacing : S --The spacing from metal edge to metal edge.

• Space for Transitions : ILEN --The length of the spacing used to construct the inter-turnconnections. Note that ILEN > (W+S).

• Turns : N --The number of spiral turns. This must be an integer as partialturns are not allowed in a symmetric structure.

• Metal Layer : METAL --The metal layer to use to wind the spiral.

• Transition Metal Layer : EXIT --The Transition Metal Layer is used to connect adjacent turns ofthe spiral without shorting the "primary" to the "secondary" ofthe inductor. This layer must differ from the Metal Layer.

• Origin of Spiral : XORG : YORG --The physical origin of the spiral relative to the lower lefthand corner of the chip. The origin of the spiral is thephysical center of the spiral. Do not place the spiral outsideof the chip boundary, and avoid abutting the spiral against thechip boundaries.

• Orientation : ORIENT --The orientation of the spiral relative to the x-axis. Angles arespecified in units of degrees and the counter-clockwisedirection is considered positive.

• Phase : PHASE --The electrical phase of the spiral. If phase = +1 then thecurrent flows from the top port into the bottom port of thespiral. In other words, the PLUS terminal of the spiral is thetop port. If phase = -1, the PLUS terminal is the bottom port ofthe spiral. The phase specification is useful for joiningspirals.(see JOIN)

Symsq: Create a Square Symmetric Spiral

Aliases: symsq,balsq,centersq,symsquare

Trans: Create a Planar Transformer

Aliases: trans,t,transformer,tr

Summary: Create a planar spiral transformer of specified dimensions. Thetransformer is constructed by interwinding two planar square spirals.At the completion of the command two spirals will reside in memory,the primary and the secondary spiral, forming a 4-port circuit.

Example:

TRANS PNAME=A:SNAME=B:LEN=150:W=7:S=3:N=3.5:METAL=M3:EXIT=M2:XORG=200:YORG=200 

If no arguments are supplied, you will be prompted for the spiral dimensions. The input parameters are as follows:

• Primary Name : NAME|PNAME --The unique name of the "primary" spiral.

• Secondary Name : SNAME --The unique name of the "secondary" spiral. Generated fromprimary name if not specified.

• Outer Dimension : LEN --The outer dimension in microns of the spiral measured from edge to edge.

• Primary Metal Width : W | WID | WP --The primary metal trace width in microns.

• Secondary Metal Width : WS --The secondary metal trace width in microns. Defaults to primary width.

• Spacing : S --The spacing from metal edge to metal edge.

• Turns : N|NP --The number of primary spiral turns. Fractional amounts divisible by .25can be used to specify partial turns. The turns must not exceedthe upper limit.

• Turns : NS --The number of secondary spiral turns. Default to primary turns.

• Metal Layer : METAL --The metal layer to use to wind the spiral.

• Exit Metal Layer : EXIT --An exit metal segment is used to provide a connection to theinner port of the spiral. A different metal layer must be usedto avoid shorting the spiral. The exit layer is constructed tocontinue the last turn of the spiral. In other words, it is inthe direction of the last segment of the spiral. To place theexit layer in another direction, do not use an exit layer butuse the WIRE command.

• Origin of Spiral : XORG : YORG --The physical origin of the spiral relative to the lower lefthand corner of the chip. The origin of the spiral is the lowerleft corner rather than the physical center of the spiral. Donot place the spiral outside of the chip boundary, and avoidabutting the spiral against the chip boundaries.

• Orientation : ORIENT --The orientation of the spiral relative to the x-axis. Angles arespecified in units of degrees and the counter-clockwisedirection is considered positive.

Via: Create a Via

Aliases: via, v, contact

Wire: Create a Wire (rectangle)

Aliases: wire,w