sirlilpanda/openscad_parameteric_IDT_creation_scripts
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sirlilpanda
2026-02-23 17:04:19 +13:00
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// inputs, delay line config
// will have to scale approperly
$fa = 1;
$fs = 0.01;
SCRIPT_VERSION="0.0.1";
FONT="Ubuntu Sans Mono:style=Regular";
// lambda = 7.5;
substrate = "SI";
test_number = 1;
// linbo
c = 3992.0;
// si
// c = 3159.0;
freq = 50.0e6;
// $fs = (c/freq);
// inout distance
distance = 50;
// number of finger
n_fingers = 50;
// should be 50-70
finger_length = 60;
// for tweaking the design
gap = 0;
// for tweaking the design
thickness = 0;
// scale in m
scale_unit = 1e3;
leg_length = 0.003;
leg_width = 0.00001875;
leg_angle = 10;
size = 0.002;
bond_pad_shape = "square";
info_block_offset_x=7;
info_block_offset_y=30;
info_block_scale=0.3;
title_text_size = 4;
prop_text_size = 2.5;
id_text_size = 2;
number_of_idts_per_quadrent=4;
idt_x_spacing = 10;
idt_y_spacing = 7;
wafer_size_inch = 4;
function length(point_1, point_2) = sqrt(
(point_1-point_2).x^2 +
(point_1-point_2).y^2 +
(point_1-point_2).z^2
);
// creates 1 side of the idt
module delay_line(lambda = 1, n_fingers = 1, finger_length = 50, gap = 0, thickness = 0) {
// code
l45 =lambda*5/4;
l2 = lambda/2;
l4 = lambda/4;
l8 = lambda/8;
b = l4 + thickness;
f = l4 + finger_length*lambda;
points_cap = [
[0, 0],
[0, l2],
[-b-f, l2],
[-b-f, l4],
[-b, l4],
[-b, 0]
];
points = [
[0, 0],
[b, 0],
[b, l2],
[b+f, l2],
[b+f, l2+l4],
[b, l2+l4],
[b, l4*5-l4],
[0, l4*5-l4]
];
// union () {
translate([0, l2, 0]){
for(i = [0:n_fingers]){
translate([0, i*(l45-l4), 0]) {
polygon(points);
}
}
color("red") {
rotate([0, 0, 180])
translate([0, 0, 0]) {
polygon(points_cap);
}
translate([f+l2+gap+thickness, -l2, 0]) {
square(size=[l4+thickness, l4]);
}
}
union() {
for(i = [0:n_fingers]){
translate([2*b+f+gap+l4, i*(l45-l4)+l2+l4 , 0])
rotate([0, 0, 180])
polygon(points);
}
}
color("red") {
translate([2*b+f+gap+l4, n_fingers*lambda+lambda-l4, 0]) {
polygon(points_cap);
}
translate([0, n_fingers*lambda+lambda, 0]) {
square(size=[l4+thickness, l4]);
}
}
}
}
// todo fix this
// units in m, the size is the min bond pad size
module bond_pad(
leg_length = 0.000075,
leg_width = 0.00001875,
leg_length_tweak = 0,
leg_angle = 45,
size = 0.000075,
bond_pad_shape = "square",
post_scale = false
) {
if (post_scale) {
circle(r=leg_width*post_scale);
rotate([0, 0, leg_angle+180]) {
translate([-leg_length*post_scale-leg_length_tweak, -leg_width*post_scale/2, 0]) {
// color([0, 255/255, 255/255]) {
// arm
square(size=[(leg_length)*post_scale+leg_length_tweak, leg_width*post_scale]);
// }
}
}
// pad
translate([post_scale*leg_length*cos(leg_angle), post_scale*leg_length*sin(leg_angle), 0]) {
square(size=[size*post_scale, size*post_scale], center=true);
}
// 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);
}
}
// creates the input and output ids
module delay_line_idt(
c,
f,
n_fingers,
distance = 100,
finger_length = 50,
gap = 0,
thickness = 0,
impedance = 50,
has_bond_pads = false,
bond_pad_leg_length = 0.00005,
bond_pad_leg_width = 0.00001875,
bond_pad_size = 0.000075,
bond_pad_angle = 45,
bond_pad_bond_pad_shape = "square",
post_scale = false,
id_number = 0,
has_id = true
) {
local_scale = 0;
// echo("===== DELAY LINE IDT INFO ===== ");
if (post_scale) {
lambda = c/f * post_scale;
// dont worry about these magic fractions
length_of_input = n_fingers*lambda+1.74*lambda;
// n_fingers*lambda+lambda/2;
echo(str("lambda = ", lambda));
// echo(str("lambda/4 = ", lambda/4));
// echo(str("lambda_scale = ", post_scale));
delay_line(lambda, n_fingers, finger_length, gap, thickness);
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])
text(str(id_number), size=id_text_size, halign="center");
}
color([0/255, 255/255, 128/255]) {
translate([0, distance*lambda+length_of_input, 0]) {
delay_line(lambda, n_fingers, finger_length, gap, thickness);
}
}
// near ori
rotate([0, 0, -90]) {
if (has_bond_pads) {
color([255/255, 255/255, 255/255]) {
bond_pad(
leg_length_tweak = lambda/4,
leg_width=c/f/4,
leg_length=length(
[0,0,0],
[bond_pad_leg_length, bond_pad_leg_length, 0]
),
leg_angle = -bond_pad_angle,
size = bond_pad_size,
post_scale=scale_unit
);
}
}
}
// near side
translate([lambda*finger_length+gap+thickness*2+lambda, 0, 0]) {
rotate([0, 0, -90]) {
if (has_bond_pads) {
bond_pad(
leg_length_tweak = lambda/5,
leg_width=c/f/4,
leg_length=length(
[0,0,0],
[bond_pad_leg_length, bond_pad_leg_length, 0]
),
leg_angle = bond_pad_angle,
size = bond_pad_size,
post_scale=scale_unit
);
}
}
}
// far side
translate([0, length_of_input+distance*lambda+length_of_input, 0]) {
rotate([0, 0, 90]) {
if (has_bond_pads) {
bond_pad(
leg_length_tweak = lambda/5,
leg_width=c/f/4,
leg_length=length(
[0,0,0],
[bond_pad_leg_length, bond_pad_leg_length, 0]
),
leg_angle = bond_pad_angle,
size = bond_pad_size,
post_scale=scale_unit
);
}
}
// furthest side
translate([lambda*finger_length+gap+thickness*2+lambda, 0, 0]) {
rotate([0, 0, 90]) {
if (has_bond_pads) {
bond_pad(
leg_length_tweak = lambda/4,
leg_width=c/f/4,
leg_length=length(
[0,0,0],
[bond_pad_leg_length, bond_pad_leg_length, 0]
),
leg_angle = -bond_pad_angle,
size = bond_pad_size,
post_scale=scale_unit
);
}
}
}
}
} else {
lambda = 1;
length_of_input = n_fingers*lambda*15/8;
echo(str("lambda = ", lambda));
echo(str("lambda_scale = ", 1));
delay_line(lambda, n_fingers, finger_length, gap, thickness);
translate([0, length_of_input+distance*lambda, 0])
delay_line(lambda, n_fingers, finger_length, gap, thickness);
}
// echo(str("impedance = ", impedance));
// echo(str("total capacitance = ", 1/(2*PI*f*impedance)));
// echo("===== DELAY LINE IDT INFO ===== ");
}
module wafer(d) {
color([128/255, 128/255, 128/255]) {
translate([0, 0, -1]) {
circle(r=d/2);
}
}
}
module prameter_text() {
text(str("IDT ", substrate, "#", test_number), size=4, font=FONT);
translate([0, -title_text_size, 0])
text(str("c : ", c), size=prop_text_size, font=FONT);
translate([0, -title_text_size*2, 0])
text(str("freq : ", freq), size=prop_text_size, font=FONT);
translate([0, -title_text_size*3, 0])
text(str("distance : ", distance), size=prop_text_size, font=FONT);
translate([0, -title_text_size*4, 0])
text(str("n_fingers : ", n_fingers), size=prop_text_size, font=FONT);
translate([0, -title_text_size*5, 0])
text(str("finger_length : ", finger_length), size=prop_text_size, font=FONT);
translate([0, -title_text_size*6, 0])
text(str("gap : ", gap), size=prop_text_size, font=FONT);
translate([0, -title_text_size*7, 0])
text(str("thickness : ", thickness), size=prop_text_size, font=FONT);
translate([0, -title_text_size*8, 0])
text(str("leg_length : ", leg_length), size=prop_text_size, font=FONT);
translate([0, -title_text_size*9, 0])
text(str("leg_angle : ", leg_angle), size=prop_text_size, font=FONT);
translate([0, -title_text_size*10, 0])
text(str("size : ", size), size=prop_text_size, font=FONT);
translate([0, -title_text_size*11, 0])
text(str("feat. size (mm): ", (c/freq)*1e3), size=prop_text_size, font=FONT);
translate([0, -title_text_size*12, 0])
text(str("version : ", SCRIPT_VERSION), size=prop_text_size, font=FONT);
}
translate([info_block_offset_x, -info_block_offset_y, 0]) {
rotate([0, 0, -90])
scale([info_block_scale, info_block_scale, info_block_scale]) {
prameter_text();
}
}
rotate([0, 0, 180])
translate([info_block_offset_x, -info_block_offset_y, 0]) {
rotate([0, 0, -90])
scale([info_block_scale, info_block_scale, info_block_scale]) {
prameter_text();
}
}
// delay_line_idt(
// c,
// freq,
// n_fingers,
// distance,
// finger_length,
// gap,
// thickness,
// post_scale=scale_unit,
// 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
// );
// wafer(wafer_size_inch*25.4);
for (i=[0:number_of_idts_per_quadrent-1]) {
translate([idt_x_spacing/4, 0, 0]) {
translate([i * idt_x_spacing, idt_y_spacing, 0]) {
delay_line_idt(
c,
freq,
n_fingers,
distance,
finger_length,
gap,
thickness,
post_scale=scale_unit,
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
);
}
translate([i * idt_x_spacing, -idt_y_spacing, 0]) {
scale([1, -1, 1]) {
delay_line_idt(
c,
freq,
n_fingers,
distance,
finger_length,
gap,
thickness,
post_scale=scale_unit,
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
);
}
}
}
scale([-1, 1, 1])
translate([idt_x_spacing/4, 0, 0]) {
translate([i * idt_x_spacing, idt_y_spacing, 0]) {
delay_line_idt(
c,
freq,
n_fingers,
distance,
finger_length,
gap,
thickness,
post_scale=scale_unit,
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
);
}
translate([i * idt_x_spacing, -idt_y_spacing, 0]) {
scale([1, -1, 1]) {
delay_line_idt(
c,
freq,
n_fingers,
distance,
finger_length,
gap,
thickness,
post_scale=scale_unit,
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
);
}
}
}
}
// bond_pad(
// leg_length = 0.0075,
// leg_width = 0.00001875,
// leg_angle = 20,
// size = 0.0075,
// bond_pad_shape = "square",
// post_scale = scale_unit
// );