fixed feature size

common_paramas.scad

@@ -1,70 +1,116 @@
+// ================= README =================
+// these are the normal parameters used by
+// each one of the layout scripts
+// however they do dont directly use them
+// and instead have thier own copy
+//
+// this was done in order to have more control
+// over each of the scripts themsevels 
+// allowing each to have even more parameters
+// and having them show up in the open scad
+// parameters window
+// ================= README =================
+
 // ================= openscad prams =================
-$fa = 1;
+
+// min angle
+$fa = 0.1;
+
+// min size
 $fs = 0.01;
 // ================= openscad prams =================
 
 // ================= meta =================
+// version number of the current script
 SCRIPT_VERSION="0.0.1";
-// this really just need to be any mon font
+
+// font for layout
 FONT="Ubuntu Sans Mono:style=Regular";
+
+// the test number ref number for this set of IDTs
 test_number = 1;
-// scale in m
+
+// this is needed due to the min size value
+// a pre scaler for the given values
 scale_unit = 1e3;
+
 // ================= meta =================
 
 
 // ================= IDT =================
+
+// the underlying substrate
 substrate = "SI";
+
 // linbo
+// the aoucstice wave speed in the substrate
 c = 3992.0;
 // si
 // c = 3159.0;
+
+// the target frequency of the IDT
 freq = 50.0e6;
 
-// $fs = (c/freq);
+// the distance between the input and output IDT
-
+// should be between 100-200
-// inout distance
 distance = 50;
 
-// number of finger
+// the number of fingers the IDT has
 n_fingers = 50;
 
-// should be 50-70
+// the length of the figure or aperture should be 50-70
 finger_length = 60; 
 
-// for tweaking the design
+// the gap between both sides of the IDT (should be used for tweaking)
 gap = 0;
 
-// for tweaking the design
+// the thickness of the wire the connects all the fingers
 thickness = 0;
 
+// adds an ID number to an IDT, useful if you have multiple on a wafer
 has_id_number = false;
 // ================= IDT =================
 
 // ================= bond pad =================
+
+// the length of the bond pad leg from the edge of the IDT to the center of the bond pad
 leg_length = 0.003;
+
+// the width of the leg
 leg_width = 0.00001875;
+
+// the angle the leg comes off from the IDT,
+// positive angle means the leg is angled away
+// negitive angle means the leg is angled inwards
 leg_angle = 10;
+
+// the size of the bond pad
 size = 0.002;
+
+// the shape of the bond pad (not implemented)
 bond_pad_shape = "square";
+
 // ================= bond pad =================
 
 // ================= text =================
+
 info_block_offset_x=7;
 info_block_offset_y=30;
+// total scale of infoblock
 info_block_scale=0.3;
+
+// the text size of the heading in the info block
 title_text_size = 4;
+
+// the size of all the sub items in the info block
 prop_text_size = 2.5;
+
+// the size of the ID numbers in on the IDTS
 id_text_size = 1;
+
 // ================= text =================
 
-// ================= array spacings =================
-number_of_idts_per_quadrent=4;
-idt_x_spacing = 10;
-idt_y_spacing = 12.5;
-// ================= array spacings =================
-
-
 // ================= wafers =================
+// the size of the wafer in inchs (why inch and not metric like everything else because its standard)
 wafer_size_inch = 4;
 // ================= wafers =================

dxfs/10MHz_pair_IDT/pair_idt.json

@@ -0,0 +1,38 @@
+{
+    "parameterSets": {
+        "design default values": {
+            "$fa": "1",
+            "$fs": "0.01",
+            "FONT": "Ubuntu Sans Mono:style=Regular",
+            "SCRIPT_VERSION": "0.0.1",
+            "bond_pad_shape": "square",
+            "c": "3992",
+            "distance": "70",
+            "finger_length": "50",
+            "freq": "1e+7",
+            "gap": "0",
+            "has_id_number": "true",
+            "id_text_size": "1",
+            "idt_1_x_offset": "-15",
+            "idt_1_y_offset": "0",
+            "idt_2_x_offset": "15",
+            "idt_2_y_offset": "0",
+            "info_block_offset_x": "32",
+            "info_block_offset_y": "-7",
+            "info_block_scale": "0.3",
+            "leg_angle": "10",
+            "leg_length": "0.003",
+            "leg_width": "0.00001875",
+            "n_fingers": "50",
+            "prop_text_size": "2.5",
+            "scale_unit": "1000",
+            "size": "0.002",
+            "substrate": "SI",
+            "test_number": "2",
+            "thickness": "0",
+            "title_text_size": "4",
+            "wafer_size_inch": "4"
+        }
+    },
+    "fileFormatVersion": "1"
+}

dxfs/10MHz_single_IDT/single_idt.json

@@ -0,0 +1,36 @@
+{
+    "parameterSets": {
+        "design default values": {
+            "$fa": "0.1",
+            "$fs": "0.01",
+            "FONT": "Ubuntu Sans Mono:style=Regular",
+            "SCRIPT_VERSION": "0.0.1",
+            "bond_pad_shape": "square",
+            "c": "3992",
+            "distance": "50",
+            "finger_length": "50",
+            "freq": "1e+7",
+            "gap": "0",
+            "has_id_number": "false",
+            "id_text_size": "1",
+            "idt_x_offset": "0",
+            "idt_y_offset": "0",
+            "info_block_offset_x": "25",
+            "info_block_offset_y": "10",
+            "info_block_scale": "0.3",
+            "leg_angle": "10",
+            "leg_length": "0.003",
+            "leg_width": "0.00001875",
+            "n_fingers": "50",
+            "prop_text_size": "2.5",
+            "scale_unit": "1000",
+            "size": "0.002",
+            "substrate": "LINBO",
+            "test_number": "1",
+            "thickness": "0",
+            "title_text_size": "4",
+            "wafer_size_inch": "4"
+        }
+    },
+    "fileFormatVersion": "1"
+}

dxfs/25MHz_cross_idt/cross_pattern_idt.json

@@ -0,0 +1,38 @@
+{
+    "parameterSets": {
+        "design default values": {
+            "$fa": "1",
+            "$fs": "0.01",
+            "FONT": "Ubuntu Sans Mono:style=Regular",
+            "SCRIPT_VERSION": "0.0.1",
+            "bond_pad_shape": "square",
+            "c": "3992",
+            "distance": "150",
+            "finger_length": "60",
+            "freq": "2.5e+7",
+            "gap": "0",
+            "has_id_number": "false",
+            "id_text_size": "1",
+            "idt_1_x_offset": "0",
+            "idt_1_y_offset": "0",
+            "idt_2_x_offset": "0",
+            "idt_2_y_offset": "0",
+            "info_block_offset_x": "20",
+            "info_block_offset_y": "-30",
+            "info_block_scale": "0.3",
+            "leg_angle": "10",
+            "leg_length": "0.003",
+            "leg_width": "0.00001875",
+            "n_fingers": "50",
+            "prop_text_size": "2.5",
+            "scale_unit": "1000",
+            "size": "0.002",
+            "substrate": "LINBO",
+            "test_number": "1",
+            "thickness": "0",
+            "title_text_size": "4",
+            "wafer_size_inch": "4"
+        }
+    },
+    "fileFormatVersion": "1"
+}

dxfs/345MHz_grid_10_10_IDT/gird_array_idt.json

@@ -0,0 +1,38 @@
+{
+    "parameterSets": {
+        "design default values": {
+            "$fa": "0.1",
+            "$fs": "0.01",
+            "FONT": "Ubuntu Sans Mono:style=Regular",
+            "SCRIPT_VERSION": "0.0.1",
+            "bond_pad_shape": "square",
+            "c": "3992",
+            "cols": "10",
+            "distance": "50",
+            "finger_length": "60",
+            "freq": "3.45e+8",
+            "gap": "0",
+            "has_id_number": "true",
+            "id_text_size": "0.5",
+            "info_block_offset_x": "28",
+            "info_block_offset_y": "-5",
+            "info_block_scale": "0.3",
+            "leg_angle": "10",
+            "leg_length": "0.001",
+            "leg_width": "0.00001875",
+            "n_fingers": "50",
+            "prop_text_size": "2.5",
+            "rows": "10",
+            "scale_unit": "1000",
+            "size": "0.00075",
+            "spacing_x": "4",
+            "spacing_y": "7",
+            "substrate": "SI",
+            "test_number": "1",
+            "thickness": "0",
+            "title_text_size": "4",
+            "wafer_size_inch": "4"
+        }
+    },
+    "fileFormatVersion": "1"
+}

makefile

@@ -0,0 +1,19 @@
+
+
+all: single_10MHZ pair_10MHZ quadrand_50MHz array_345MHz cross_25MHz
+
+
+single_10MHZ:
+	openscad -o dxfs/10MHz_single_IDT/single_10MHZ.dxf wafer_layouts/single_idt.scad -p dxfs/10MHz_single_IDT/single_idt.json
+
+pair_10MHZ:
+	openscad -o dxfs/10MHz_pair_IDT/pair_10MHZ.dxf wafer_layouts/pair_idt.scad -p dxfs/10MHz_single_IDT/pair_idt.json
+
+quadrand_50MHz:
+	openscad -o dxfs/50MHz_quadrant_array_16/quadrand_50MHz.dxf wafer_layouts/quadrant_array.scad -p dxfs/50MHz_quadrant_array_16/quadrant_array_16_50MHz.json
+
+array_345MHz:
+	openscad -o dxfs/345MHz_grid_10_10_IDT/array_345MHz.dxf wafer_layouts/gird_array_idt.scad -p dxfs/345MHz_grid_10_10_IDT/gird_array_idt.json
+
+cross_25MHz:
+	openscad -o dxfs/25MHz_cross_idt/cross_25MHz.dxf wafer_layouts/cross_pattern_idt.scad -p dxfs/25MHz_cross_idt/cross_pattern_idt.json

modules/bidirectional_idt.scad

@@ -24,7 +24,9 @@ module bi_directional_idt(
     // id number prams
     id_number = 0,
     has_id = false,
-    id_flip_dir = [1, 1, 1],
+    id_scale = [1, 1, 1],
+    id_translate = [0, 0, 0],
+    id_rot = [0, 0, 0],
     // extra
     post_scale = 1,
     echo_stats = false,
@@ -46,7 +48,9 @@ module bi_directional_idt(
     if (has_id) {
         color([255/255, 0/255, 255/255])
         translate([finger_length*lambda/2, has_bond_pads ? -(bond_pad_leg_length * post_scale * cos(bond_pad_angle)) : -lambda*finger_length/2, 0])
-        scale(id_flip_dir)
+        translate(id_translate)
+        rotate(id_rot) 
+        scale(id_scale)
         text(str(id_number), size=id_text_size, halign="center");
     }
     

modules/bond_pad.scad

@@ -15,7 +15,6 @@ module bond_pad(
     bond_pad_shape = "square", 
     post_scale = false
 ) {
-    if (post_scale) {
     circle(r=leg_width*post_scale);
 
     rotate([0, 0, leg_angle+180]) {
@@ -33,16 +32,4 @@ module bond_pad(
 
     // echo(str("x = ", post_scale*leg_length*cos(leg_angle+180)));
     // echo(str("y = ", post_scale*leg_length*sin(leg_angle+180)));
-
-    
-    } else {
-        rotate([0, 0, leg_angle+180]) {
-            translate([-leg_length/2, -leg_width, 0]) {
-                // color([0, 255/255, 255/255]) {
-                    square(size=[leg_length, leg_width]);                
-                // }
-            }
-        }
-        square(size=[size, size], center=true);
-    }
 }

modules/idt.scad

@@ -1,6 +1,14 @@
 // creates 1 side of the idt
-module delay_line(lambda = 1, n_fingers = 1, finger_length = 50, gap = 0, thickness = 0) {
+module delay_line(
-    // code
+    lambda = 1, 
+    n_fingers = 1, 
+    finger_length = 50, 
+    gap = 0, 
+    thickness = 0
+) {
+
+    // just a very small value that allows the polygons to overlap nicely
+    esp = $fs;
     l45 =lambda*5/4;
     l2 = lambda/2;
     l4 = lambda/4;
@@ -24,10 +32,10 @@ module delay_line(lambda = 1, n_fingers = 1, finger_length = 50, gap = 0, thickn
         [b+f, l2],
         [b+f, l2+l4],
         [b, l2+l4],
-        [b, l4*5-l4],
+        [b, l4*5-l4 + esp],
-        [0, l4*5-l4]
+        [0, l4*5-l4 + esp]
     ];
-    // union () {
+    union () {
 
     translate([0, l2, 0]){
             for(i = [0:n_fingers]){
@@ -64,6 +72,6 @@ module delay_line(lambda = 1, n_fingers = 1, finger_length = 50, gap = 0, thickn
                 square(size=[l4+thickness, l4]);
             }
         }
-
+    }
     }
 }

wafer_layouts/cross_pattern_idt.scad

@@ -36,7 +36,7 @@ substrate = "LINBO";
 c = 3992.0;
 // si
 // c = 3159.0;
-freq = 50.0e6;
+freq = 25.0e6;
 
 // $fs = (c/freq);
 
@@ -101,7 +101,7 @@ module params() {
             str("leg_length     : ", leg_length),
             str("leg_angle      : ", leg_angle),
             str("size           : ", size),
-            str("feat. size (mm): ", (c/freq)*1e3),
+            str("feat. size (mm): ", (c/freq)*1e3 / 4),
             str("version        : ", SCRIPT_VERSION)
         ]
     );

wafer_layouts/gird_array_idt.scad

@@ -0,0 +1,188 @@
+include <../modules/bidirectional_idt.scad>
+include <../modules/parameter_text.scad>
+include <../modules/wafer.scad>
+
+// ================= README =================
+// these are the normal parameters used by
+// each one of the layout scripts
+// however they do dont directly use them
+// and instead have thier own copy
+//
+// this was done in order to have more control
+// over each of the scripts themsevels 
+// allowing each to have even more parameters
+// and having them show up in the open scad
+// parameters window
+// ================= README =================
+
+// ================= openscad prams =================
+
+// min angle
+$fa = 0.1;
+
+// min size
+$fs = 0.01;
+// ================= openscad prams =================
+
+// ================= meta =================
+// version number of the current script
+SCRIPT_VERSION="0.0.1";
+
+// font for layout
+FONT="Ubuntu Sans Mono:style=Regular";
+
+// the test number ref number for this set of IDTs
+test_number = 1;
+
+// this is needed due to the min size value
+// a pre scaler for the given values
+scale_unit = 1e3;
+
+// ================= meta =================
+
+
+// ================= IDT =================
+
+// the underlying substrate
+substrate = "SI";
+
+// linbo
+// the aoucstice wave speed in the substrate
+c = 3992.0;
+// si
+// c = 3159.0;
+
+// the target frequency of the IDT
+freq = 345.0e6;
+
+// the distance between the input and output IDT
+// should be between 100-200
+distance = 50;
+
+// the number of fingers the IDT has
+n_fingers = 50;
+
+// the length of the figure or aperture should be 50-70
+finger_length = 60; 
+
+// the gap between both sides of the IDT (should be used for tweaking)
+gap = 0;
+
+// the thickness of the wire the connects all the fingers
+thickness = 0;
+
+// adds an ID number to an IDT, useful if you have multiple on a wafer
+has_id_number = true;
+// ================= IDT =================
+
+// ================= bond pad =================
+
+// the length of the bond pad leg from the edge of the IDT to the center of the bond pad
+leg_length = 0.001;
+
+// the width of the leg
+leg_width = 0.00001875;
+
+// the angle the leg comes off from the IDT,
+// positive angle means the leg is angled away
+// negitive angle means the leg is angled inwards
+leg_angle = 10;
+
+// the size of the bond pad
+size = 0.00075;
+
+// the shape of the bond pad (not implemented)
+bond_pad_shape = "square";
+
+// ================= bond pad =================
+
+// ================= text =================
+
+info_block_offset_x=28;
+info_block_offset_y=-5;
+// total scale of infoblock
+info_block_scale=0.3;
+
+// the text size of the heading in the info block
+title_text_size = 4;
+
+// the size of all the sub items in the info block
+prop_text_size = 2.5;
+
+// the size of the ID numbers in on the IDTS
+id_text_size = 0.5;
+
+// ================= text =================
+
+// ================= wafers =================
+// the size of the wafer in inchs (why inch and not metric like everything else because its standard)
+wafer_size_inch = 4;
+// ================= wafers =================
+
+// ================= # IDTS =================
+
+rows = 10;
+cols = 10;
+spacing_x = 4;
+spacing_y = 7;
+
+// ================= # IDTS =================
+
+
+module params() {
+    parameter_text(
+        str("IDT ", substrate, "#", test_number),
+        [
+            str("c          (ms): ", c),
+            str("freq       (Hz): ", freq),
+            str("distance       : ", distance),
+            str("n_fingers      : ", n_fingers),
+            str("finger_length  : ", finger_length),
+            str("gap            : ", gap),
+            str("thickness      : ", thickness),
+            str("leg_length     : ", leg_length),
+            str("leg_angle      : ", leg_angle),
+            str("size           : ", size),
+            str("feat. size (mm): ", (c/freq)*1e3 / 4),
+            str("version        : ", SCRIPT_VERSION)
+        ]
+    );
+}
+
+
+
+translate([info_block_offset_x, -info_block_offset_y, 0])
+scale([info_block_scale, info_block_scale, info_block_scale])
+params();
+
+wafer(4*0.0254*scale_unit);
+
+translate([-spacing_x*rows/2, -spacing_y*cols/2, 0])
+for (x=[0:rows]) {
+    for (y=[0:cols]) {
+        translate([spacing_x*x, spacing_y*y, 0])
+        bi_directional_idt(
+            c, 
+            freq, 
+            n_fingers, 
+            distance, 
+            finger_length, 
+            gap, 
+            thickness, 
+            post_scale=scale_unit,
+            center = true,
+            has_bond_pads = true,
+            bond_pad_angle = leg_angle,
+            bond_pad_leg_width = leg_width,
+            bond_pad_leg_length = leg_length,
+            bond_pad_size = size,
+            has_id = has_id_number,
+            id_translate = [1.7, -0.5, 0],
+            id_rot = [0, 0, 90],
+            id_number = x*rows + y
+        );
+    
+    }
+}
+
+

wafer_layouts/hex_layout_idt.scad

@@ -105,7 +105,7 @@ module params() {
             str("leg_length     : ", leg_length),
             str("leg_angle      : ", leg_angle),
             str("size           : ", size),
-            str("feat. size (mm): ", (c/freq)*1e3),
+            str("feat. size (mm): ", (c/freq)*1e3 / 4),
             str("version        : ", SCRIPT_VERSION)
         ]
     );

wafer_layouts/pair_idt.scad

@@ -25,7 +25,11 @@ SCRIPT_VERSION="0.0.1";
 // this really just need to be any mon font
 FONT="Ubuntu Sans Mono:style=Regular";
 test_number = 1;
+
 // scale in m
+// 1e3 : mm
+// 1e6 : um
+// 1e9 : nm
 scale_unit = 1e3;
 // ================= meta =================
 
@@ -36,18 +40,18 @@ substrate = "LINBO";
 c = 3992.0;
 // si
 // c = 3159.0;
-freq = 50.0e6;
+freq = 10.0e6;
 
 // $fs = (c/freq);
 
 // inout distance
-distance = 50;
+distance = 70;
 
 // number of finger
 n_fingers = 50;
 
 // should be 50-70
-finger_length = 60; 
+finger_length = 50; 
 
 // for tweaking the design
 gap = 0;
@@ -55,7 +59,7 @@ gap = 0;
 // for tweaking the design
 thickness = 0;
 
-has_id_number = false;
+has_id_number = true;
 // ================= IDT =================
 
 // ================= bond pad =================
@@ -67,8 +71,8 @@ bond_pad_shape = "square";
 // ================= bond pad =================
 
 // ================= text =================
-info_block_offset_x=20;
+info_block_offset_x=32;
-info_block_offset_y=-15;
+info_block_offset_y=-7;
 info_block_scale=0.3;
 title_text_size = 4;
 prop_text_size = 2.5;
@@ -76,9 +80,9 @@ id_text_size = 1;
 // ================= text =================
 
 // ================= IDT Pos =================
-idt_1_x_offset = -5;
+idt_1_x_offset = -15;
 idt_1_y_offset = 0;
-idt_2_x_offset = 5;
+idt_2_x_offset = 15;
 idt_2_y_offset = 0;
 // ================= IDT Pos =================
 
@@ -101,7 +105,7 @@ module params() {
             str("leg_length     : ", leg_length),
             str("leg_angle      : ", leg_angle),
             str("size           : ", size),
-            str("feat. size (mm): ", (c/freq)*1e3),
+            str("feat. size (mm): ", (c/freq)*1e3 / 4),
             str("version        : ", SCRIPT_VERSION)
         ]
     );
@@ -128,6 +132,7 @@ bi_directional_idt(
     bond_pad_leg_width = leg_width,
     bond_pad_leg_length = leg_length,
     bond_pad_size = size,
+    has_id = has_id_number,
     center = true
 );
 
@@ -146,5 +151,7 @@ bi_directional_idt(
     bond_pad_leg_width = leg_width,
     bond_pad_leg_length = leg_length,
     bond_pad_size = size,
+    has_id = has_id_number,
+    id_number = 1,
     center = true
 );

wafer_layouts/quadrant_array.scad

@@ -89,7 +89,7 @@ module params() {
             str("leg_length     : ", leg_length),
             str("leg_angle      : ", leg_angle),
             str("size           : ", size),
-            str("feat. size (mm): ", (c/freq)*1e3),
+            str("feat. size (mm): ", (c/freq)*1e3 / 4),
             str("version        : ", SCRIPT_VERSION)
         ]
     );
@@ -156,7 +156,7 @@ for (i=[0:number_of_idts_per_quadrent-1]) {
                 bond_pad_size = size,
                 has_id = has_id_number,
                 id_number = i + number_of_idts_per_quadrent,
-                id_flip_dir = [1, -1, -1]
+                id_scale = [1, -1, -1]
             );
        }
     }
@@ -182,7 +182,7 @@ for (i=[0:number_of_idts_per_quadrent-1]) {
                 bond_pad_size = size, 
                 has_id = has_id_number,
                 id_number = i + number_of_idts_per_quadrent*2,
-                id_flip_dir = [-1, 1, 1]
+                id_scale = [-1, 1, 1]
             );
     }
     translate([i * idt_x_spacing, -idt_y_spacing/2, 0]) {
@@ -203,7 +203,7 @@ for (i=[0:number_of_idts_per_quadrent-1]) {
                 bond_pad_size = size, 
                 has_id = has_id_number,
                 id_number = i + number_of_idts_per_quadrent*3,
-                id_flip_dir = [-1, -1, 1]
+                id_scale = [-1, -1, 1]
             );
         }
     }

wafer_layouts/single_idt.scad

@@ -15,75 +15,121 @@ include <../modules/wafer.scad>
 // parameters window
 // ================= README =================
 
+
 // ================= openscad prams =================
-$fa = 1;
+
+// min angle
+$fa = 0.1;
+
+// min size
 $fs = 0.01;
 // ================= openscad prams =================
 
 // ================= meta =================
+// version number of the current script
 SCRIPT_VERSION="0.0.1";
-// this really just need to be any mon font
+
+// font for layout
 FONT="Ubuntu Sans Mono:style=Regular";
+
+// the test number ref number for this set of IDTs
 test_number = 1;
-// scale in m
+
+// this is needed due to the min size value
+// a pre scaler for the given values
 scale_unit = 1e3;
+
 // ================= meta =================
 
-
 // ================= IDT =================
-substrate = "LINBO";
+
+// the underlying substrate
+substrate = "SI";
+
 // linbo
+// the acoustic wave speed in the substrate
 c = 3992.0;
 // si
 // c = 3159.0;
-freq = 50.0e6;
 
-// $fs = (c/freq);
+// the target frequency of the IDT
+freq = 10.0e6;
 
-// inout distance
+// the distance between the input and output IDT
+// should be between 100-200
 distance = 50;
 
-// number of finger
+// the number of fingers the IDT has
 n_fingers = 50;
 
-// should be 50-70
+// the length of the figure or aperture should be 50-70
-finger_length = 60; 
+finger_length = 50; 
 
-// for tweaking the design
+// the gap between both sides of the IDT (should be used for tweaking)
 gap = 0;
 
-// for tweaking the design
+// the thickness of the wire the connects all the fingers
 thickness = 0;
 
+// adds an ID number to an IDT, useful if you have multiple on a wafer
 has_id_number = false;
 // ================= IDT =================
 
 // ================= bond pad =================
+
+// the length of the bond pad leg from the edge of the IDT to the center of the bond pad
 leg_length = 0.003;
+
+// the width of the leg
 leg_width = 0.00001875;
+
+// the angle the leg comes off from the IDT,
+// positive angle means the leg is angled away
+// negitive angle means the leg is angled inwards
 leg_angle = 10;
+
+// the size of the bond pad
 size = 0.002;
+
+// the shape of the bond pad (not implemented)
 bond_pad_shape = "square";
+
 // ================= bond pad =================
 
 // ================= text =================
-info_block_offset_x=20;
+
-info_block_offset_y=-15;
+info_block_offset_x=25;
+info_block_offset_y=10;
+// total scale of infoblock
 info_block_scale=0.3;
+
+// the text size of the heading in the info block
 title_text_size = 4;
+
+// the size of all the sub items in the info block
 prop_text_size = 2.5;
+
+// the size of the ID numbers in on the IDTS
 id_text_size = 1;
+
 // ================= text =================
 
-// ================= IDT Pos =================
-idt_x_offset = 0;
-idt_y_offset = 0;
-// ================= IDT Pos =================
-
 // ================= wafers =================
+// the size of the wafer in inchs (why inch and not metric like everything else because its standard)
 wafer_size_inch = 4;
 // ================= wafers =================
 
+
+
+// ================= IDT Pos =================
+
+// the x offset of the IDT from the center
+idt_x_offset = 0;
+// the y offset of the IDT from the center
+idt_y_offset = 0;
+
+// ================= IDT Pos =================
+
 module params() {
     parameter_text(
         str("IDT ", substrate, "#", test_number),
@@ -98,7 +144,7 @@ module params() {
             str("leg_length     : ", leg_length),
             str("leg_angle      : ", leg_angle),
             str("size           : ", size),
-            str("feat. size (mm): ", (c/freq)*1e3),
+            str("feat. size (mm): ", (c/freq)*1e3 / 4),
             str("version        : ", SCRIPT_VERSION)
         ]
     );