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iq_mismatch_calc.html
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iq_mismatch_calc.html
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<!doctype html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" type="image/x-icon" href="favicon.ico">
<link rel="stylesheet" type="text/css" href="style2.css">
<title>I/Q Signal Mismatch Calculator</title>
<script type="text/javascript" src="page.js"></script>
<style type="text/css">
div.linebreak {
width: 100%;
}
div.box.form_container {
-webkit-flex: 100 1 20rem;
flex: 100 1 20rem;
-webkit-justify-content: flex-start;
justify-content: flex-start;
-webkit-align-items: baseline;
align-items: baseline;
}
div.box.figure_container {
-webkit-flex: 1 1 calc(120px + 2.4em);
flex: 1 1 calc(120px + 2.4em);
-webkit-justify-content: space-around;
justify-content: space-around;
-webkit-align-content: space-around;
align-content: space-around;
}
h2 {
-webkit-flex: 1 1 auto;
flex: 1 1 auto;
margin: 1rem 0rem 0.5rem 0rem;
width: 100%;
}
div.hcontainer > div.text, div.comment {
margin-left: 1rem;
margin-right: 0rem;
}
div.output {
box-sizing: border-box;
width: 100%;
text-align: right;
border: 1px solid;
font-weight: bold;
color: #000000;
padding: 0.1em 0em;
}
input[type="text"] {
box-sizing: border-box;
width: 100%;
font-size: 100%;
text-align: right;
}
div.hcontainer > div.unit {
-webkit-flex: 0 1 auto;
flex: 0 1 auto;
margin-left: 0.2em;
width: 1.7em;
}
div.hcontainer > div.comment {
font-size: 80%;
}
div.box.graphframe {
-webkit-flex: 0 1 auto;
flex: 0 1 auto;
padding: 0.2em;
}
div.canvas {
position: relative;
width: 100px; height: 100px;
background-color: #FFFFFF;
overflow: hidden;
}
div.xaxis {
position: absolute;
left: 0px; top: 49px;
width: 100%; height: 2px;
font-size: 0px;
line-height: 0px;
background-color: #666666;
}
div.xaxis div.arrow {
position: absolute;
right: 0px; top: -4px;
width: 0px; height: 2px;
border-top: 4px solid #FFFFFF;
border-right: 0px;
border-bottom: 4px solid #FFFFFF;
border-left: 10px solid #666666;
font-size: 0px;
line-height: 0px;
background-color: #FFFFFF;
}
div.xaxis div.axisname {
position: absolute;
right: 2px; top: -14px;
width: 40px; height: 0px;
overflow: visible;
font: 10px sans-serif;
line-height: 100%;
text-align: right;
color: #666666;
}
div.yaxis {
position: absolute;
left: 49px; top: 0px;
width: 2px; height: 100%;
font-size: 0px;
line-height: 0px;
background-color: #666666;
}
div.yaxis div.arrow {
position: absolute;
left: -4px; top: 0px;
width: 2px; height: 0px;
border-top: 0px;
border-right: 4px solid #FFFFFF;
border-bottom: 10px solid #666666;
border-left: 4px solid #FFFFFF;
font-size: 0px;
line-height: 0px;
background-color: #FFFFFF;
}
div.yaxis div.axisname {
position: absolute;
left: 6px; top: 0px;
width: 0px; height: 0px;
overflow: visible;
font: 10px sans-serif;
white-space: nowrap;
line-height: 100%;
color: #666666;
}
div.pixels {
position: absolute;
left: 0px; top: 0px;
}
div.pixel {
position: absolute;
left: 0px; top: 0px;
width: 2px; height: 2px;
font-size: 0px;
line-height: 0px;
background-color: #FFFFFF;
}
div.line {
position: absolute;
left: 0px; top: 5px;
width: 2px; height: 100%;
font-size: 0px;
line-height: 0px;
background-color: #FF0000;
}
</style>
<script type="text/javascript">
genericPageSetup.extra_menu_buttons = [['theory_button', 'Theory', 'window.open("iq_mismatch_theory/doc.html", "_blank")']];
var canvas1_width = 120;
var canvas1_height = 120;
var center1_x = canvas1_width/2 - 1;
var center1_y = canvas1_height/2 - 1;
var n_pixels = 32;
var amplitude = 43;
var canvas2_width = 120;
var canvas2_height = 120;
var center2_x = canvas2_width/2 - 1;
var center2_y = 15;
var pixelstyle = new Array(n_pixels);
var headpixcolor = "#FF0000";
var tailpixcolor = "#FF8888";
var unwantedstyle;
var wantedstyle;
var n_transition_steps = 16;
var weight = new Array(n_transition_steps);
var weight_max = 4 * n_transition_steps;
var coordqueue = new Array(2 * n_pixels);
coordqueue.read_i = 0;
coordqueue.write_i = 0;
var i;
for (i = 0; i < weight.length; i++) {
weight[i] = Math.round(weight_max * (1 - Math.cos(Math.PI * i/weight.length))/2);
}
function update() {
var i,ai,aq,newuw,neww;
var error = false;
var a = 1 * document.getElementById('alpha').value;
var e = 1 * document.getElementById('epsilon').value;
if (!isFinite(e)) {
document.getElementById('result').innerHTML = "Illegal phase mismatch!";
error = true;
}
if (isNaN(a)) {
document.getElementById('result').innerHTML = "Illegal amplitude mismatch!";
error = true;
}
if (error) {
ai = aq = e = 0;
newuw = neww = canvas2_height;
} else {
a = Math.pow(10,a/20);
e = e*Math.PI/180;
var uw = 10*Math.log((1+a*a-2*a*Math.cos(e))/(1+a*a+2*a*Math.cos(e)))/Math.log(10);
if (isNaN(uw))
uw = 0;
document.getElementById('result').innerHTML = uw;
if (a < 1) {
ai = amplitude;
aq = amplitude * a;
} else {
ai = amplitude / a;
aq = amplitude;
}
uw = Math.round(uw);
if (uw < 0) {
newuw = Math.min(canvas2_height, center2_y - uw);
neww = center2_y;
} else {
newuw = center2_y;
neww = Math.min(canvas2_height, center2_y + uw);
}
}
var r_i = coordqueue.read_i;
var w_i = r_i;
for (i = 0; i < n_transition_steps + n_pixels; i++) {
var ph = 2 * Math.PI * (w_i % n_pixels)/n_pixels;
var newx = center1_x + Math.round(ai * Math.cos(ph));
var newy = center1_y - Math.round(aq * Math.sin(ph + e));
var qelem = coordqueue[w_i];
if (i < n_transition_steps) {
qelem.x = (weight[i] * newx
+ (weight_max - weight[i]) * coordqueue[r_i].x) / weight_max;
qelem.y = (weight[i] * newy
+ (weight_max - weight[i]) * coordqueue[r_i].y) / weight_max;
qelem.uwtop = (weight[i] * newuw
+ (weight_max - weight[i]) * coordqueue[r_i].uwtop) / weight_max;
qelem.wtop = (weight[i] * neww
+ (weight_max - weight[i]) * coordqueue[r_i].wtop) / weight_max;
r_i = (r_i + 1) % coordqueue.length;
if (r_i == coordqueue.write_i)
r_i = (r_i - n_pixels + coordqueue.length) % coordqueue.length;
} else {
qelem.x = newx;
qelem.y = newy;
qelem.uwtop = newuw;
qelem.wtop = neww;
}
w_i = (w_i + 1) % coordqueue.length;
}
coordqueue.write_i = w_i;
return true;
}
function timer() {
var qelem, styl;
var pix_i = coordqueue.read_i % n_pixels;
qelem = coordqueue[coordqueue.read_i];
styl = pixelstyle[pix_i];
styl.left = qelem.x + "px";
styl.top = qelem.y + "px";
styl.width = "2px";
styl.height = "2px";
styl.backgroundColor = tailpixcolor;
coordqueue.read_i = (coordqueue.read_i + 1) % coordqueue.length;
if (coordqueue.read_i == coordqueue.write_i)
coordqueue.read_i = (coordqueue.read_i - n_pixels + coordqueue.length) % coordqueue.length;
pix_i = coordqueue.read_i % n_pixels;
qelem = coordqueue[coordqueue.read_i];
styl = pixelstyle[pix_i];
styl.left = (qelem.x - 1) + "px";
styl.top = (qelem.y - 1) + "px";
styl.width = "4px";
styl.height = "4px";
styl.backgroundColor = headpixcolor;
unwantedstyle.top = qelem.uwtop + "px";
wantedstyle.top = qelem.wtop + "px";
}
function init() {
var i,styl;
document.getElementById('alpha').value = 0;
document.getElementById('epsilon').value = 0;
for (i = 0; i < coordqueue.length; i++) {
var qelem = coordqueue[i] = new Object;
qelem.x = center1_x;
qelem.y = center1_y;
qelem.uwtop = canvas2_height;
qelem.wtop = canvas2_height;
}
// Prepare graph 1
var htmlstr = "";
for (i = 0; i < n_pixels; i++) {
htmlstr += "<div id='pix" + i + "' class='pixel'><\/div>\n";
}
document.getElementById("pixels1").innerHTML = htmlstr;
styl = document.getElementById("canvas1").style;
styl.width = canvas1_width + "px";
styl.height = canvas1_height + "px";
document.getElementById("xaxis1").style.top = center1_y + "px";
document.getElementById("yaxis1").style.left = center1_x + "px";
for (i = 0; i < n_pixels; i++) {
styl = pixelstyle[i] = document.getElementById("pix" + i).style;
styl.left = center1_x + "px";
styl.top = center1_y + "px";
styl.backgroundColor = tailpixcolor;
}
// Prepare graph 2
styl = document.getElementById("canvas2").style;
styl.width = canvas2_width + "px";
styl.height = canvas2_height + "px";
document.getElementById("xaxis2").style.top = center2_y + "px";
document.getElementById("yaxis2").style.left = center2_x + "px";
styl = unwantedstyle = document.getElementById("unwanted").style;
styl.left = "20px";
styl.top = canvas2_height + "px";
styl = wantedstyle = document.getElementById("wanted").style;
styl.left = (canvas2_width - 22) + "px";
styl.top = canvas2_height + "px";
update();
setInterval(timer, 80);
}
window.addEventListener('load', init, false);
</script>
</head>
<body>
<div class="hcontainer">
<h1>I/Q Signal Mismatch Calculator</h1>
<div class="box hcontainer form_container">
<h2>Amplitude mismatch</h2>
<div class="text"><input id="alpha" type="text" value=0 maxlength=30 onKeyUp="update()" onBlur="update()"></div><div class="unit">dB</div>
<div class="linebreak"></div>
<div class="comment">Note: This is Q amplitude / I amplitude, converted to dB.</div>
<h2>Phase mismatch</h2>
<div class="text"><input id="epsilon" type="text" value=0 maxlength=30 onKeyUp="update()" onBlur="update()"></div><div class="unit">°</div>
<div class="linebreak"></div>
<div class="comment">Note: This is Q phase - (I phase - 90°).</div>
<h2>Resulting unwanted signal</h2>
<div class="text"><div id="result" class="output"></div></div><div class="unit">dB</div>
<div class="linebreak"></div>
<div class="comment">Note: This is magnitude of unwanted spectral component (at frequency -f) relative to wanted component (at frequency f), in dB.</div>
</div>
<div class="box hcontainer figure_container">
<div class="box graphframe">
<div id="canvas1" class="canvas">
<div id="xaxis1" class="xaxis"><div class="arrow"></div><div class="axisname">I</div></div>
<div id="yaxis1" class="yaxis"><div class="arrow"></div><div class="axisname">Q</div></div>
<div id="pixels1" class="pixels"></div>
</div>
</div>
<div class="box graphframe">
<div id="canvas2" class="canvas">
<div id="xaxis2" class="xaxis"><div class="arrow"></div><div class="axisname">f</div></div>
<div id="yaxis2" class="yaxis"><div class="arrow"></div><div class="axisname">mag(dB)</div></div>
<div id="unwanted" class="line"></div>
<div id="wanted" class="line"></div>
</div>
</div>
</div>
</div>
</body>
</html>