Retina Chip Wiki - Recent changes [en]

Block:SC LPF RC1.9

Ronald — Fri, 04 Sep 2026 09:19:31 GMT

replace math tags with plain text (no Math extension)

← Older revision		Revision as of 09:19, 4 September 2026
Line 8:		Line 8:
	! Parameter !! Value		! Parameter !! Value
	\|-		\|-
	\| ~~<math>~~C_1~~</math>~~ \|\| TBD		\| ''C_1'' \|\| TBD
	\|-		\|-
	\| ~~<math>~~C_2~~</math>~~ \|\| TBD		\| ''C_2'' \|\| TBD
	\|-		\|-
	\| ~~<math>~~f_{clk}~~</math>~~ \|\| TBD		\| ''f_{clk}'' \|\| TBD
	\|-		\|-
	\| ~~<math>~~f_c~~</math>~~ (target) \|\| TBD		\| ''f_c'' (target) \|\| TBD
	\|-		\|-
	\| Supply \|\| 0.9 V		\| Supply \|\| 0.9 V

Method:kTC noise budget

Ronald — Fri, 04 Sep 2026 09:19:31 GMT

replace math tags with plain text (no Math extension)

← Older revision		Revision as of 09:19, 4 September 2026
Line 4:		Line 4:
	Switched-cap kTC noise budgeting procedure.		Switched-cap kTC noise budgeting procedure.

	~~<math>~~v_{n,kTC} = \sqrt{\frac{kT}{C}}~~</math>~~		''v_{n,kTC} = \sqrt{\frac{kT}{C}}''

	''TBD — flesh out.''		''TBD — flesh out.''

Block:SC LPF

Ronald — Fri, 04 Sep 2026 09:19:30 GMT

replace math tags with plain text (no Math extension)

← Older revision		Revision as of 09:19, 4 September 2026
Line 7:		Line 7:
	=== Design equation ===		=== Design equation ===
	Corner frequency is set by the capacitor ratio and the switch clock:		Corner frequency is set by the capacitor ratio and the switch clock:
	~~<math>~~f_c = \frac{1}{2\pi} \cdot \frac{C_2}{C_1} \cdot f_{clk}~~</math>~~		''f_c = \frac{1}{2\pi} \cdot \frac{C_2}{C_1} \cdot f_{clk}''

	=== Budgeting procedure ===		=== Budgeting procedure ===
	# Choose ~~<math>~~f_c~~</math>~~ from the signal band of interest.		# Choose ''f_c'' from the signal band of interest.
	# Pick ~~<math>~~C_1~~</math>~~ for kTC-noise floor; ~~<math>~~C_2~~</math>~~ follows from the ratio.		# Pick ''C_1'' for kTC-noise floor; ''C_2'' follows from the ratio.
	# Verify switch on-resistance gives adequate settling within the clock phase.		# Verify switch on-resistance gives adequate settling within the clock phase.
	# Run kTC noise budget ([[Method:kTC noise budget\|method]]) to confirm.		# Run kTC noise budget ([[Method:kTC noise budget\|method]]) to confirm.
Line 17:		Line 17:
	=== Known failure modes ===		=== Known failure modes ===
	* Clock feedthrough corrupting the passband.		* Clock feedthrough corrupting the passband.
	* Incomplete settling (too-high switch ~~<math>~~R_{on}~~</math>~~) causing gain error.		* Incomplete settling (too-high switch ''R_{on}'') causing gain error.
	* kTC noise dominating the front-end floor if ~~<math>~~C_1~~</math>~~ is too small.		* kTC noise dominating the front-end floor if ''C_1'' is too small.

	=== Instances ===		=== Instances ===
	* [[Block:SC LPF RC1.9\|RC1.9]] — implemented, post-PEX verified		* [[Block:SC LPF RC1.9\|RC1.9]] — implemented, post-PEX verified
	* [[Block:SC LPF RC2.0\|RC2.0]] — ''TBD''		* [[Block:SC LPF RC2.0\|RC2.0]] — ''TBD''

MediaWiki:Common.js

Ronald — Fri, 04 Sep 2026 09:19:08 GMT

add chat widget

New page

/**
* Retina Chip Wiki chat widget (wiki3.rohmega.com).
* Floating chat bubble in the bottom-right. Grounded Q&A over the wiki.
* Public wiki -> the backend enforces a daily token budget.
*
* ES5-safe only: ResourceLoader minifier rejects trailing commas in call args,
* arrow functions, template literals.
*/
(function () {
'use strict';

// Don't double-inject
if (document.getElementById('rmg-chat-root')) {
return;
}

var CHAT_ENDPOINT = '/chat/chat'; // same-origin via Caddy /chat/* -> :8111

function buildUI() {
var root = document.createElement('div');
root.id = 'rmg-chat-root';

// --- floating toggle button ---
var btn = document.createElement('button');
btn.id = 'rmg-chat-toggle';
btn.setAttribute('aria-label', 'Ask the wiki');
btn.textContent = '💬';
root.appendChild(btn);

// --- panel ---
var panel = document.createElement('div');
panel.id = 'rmg-chat-panel';
panel.style.display = 'none';

var head = document.createElement('div');
head.id = 'rmg-chat-head';
var title = document.createElement('span');
title.textContent = 'Ask the Retina Chip Wiki';
var close = document.createElement('button');
close.textContent = '×';
close.setAttribute('aria-label', 'Close');
head.appendChild(title);
head.appendChild(close);
panel.appendChild(head);

var msgs = document.createElement('div');
msgs.id = 'rmg-chat-msgs';
panel.appendChild(msgs);

var foot = document.createElement('div');
foot.id = 'rmg-chat-foot';
var input = document.createElement('input');
input.id = 'rmg-chat-input';
input.setAttribute('placeholder', 'Ask about blocks, ADRs, methods…');
var send = document.createElement('button');
send.id = 'rmg-chat-send';
send.textContent = 'Send';
foot.appendChild(input);
foot.appendChild(send);
panel.appendChild(foot);

root.appendChild(panel);
document.body.appendChild(root);

// wire events
btn.addEventListener('click', function () {
var open = panel.style.display !== 'none';
panel.style.display = open ? 'none' : 'block';
});
close.addEventListener('click', function () {
panel.style.display = 'none';
});
send.addEventListener('click', ask);
input.addEventListener('keydown', function (e) {
if (e.key === 'Enter') {
ask();
}
});
}

function addBubble(text, who) {
var msgs = document.getElementById('rmg-chat-msgs');
var b = document.createElement('div');
b.className = 'rmg-bubble ' + who;
b.textContent = text;
msgs.appendChild(b);
msgs.scrollTop = msgs.scrollHeight;
return b;
}

function ask() {
var input = document.getElementById('rmg-chat-input');
var send = document.getElementById('rmg-chat-send');
var q = input.value.trim();
if (!q) {
return;
}
input.value = '';
addBubble(q, 'user');
send.disabled = true;

var typing = addBubble('…', 'bot');

var xhr = new XMLHttpRequest();
xhr.open('POST', CHAT_ENDPOINT, true);
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.onreadystatechange = function () {
if (xhr.readyState !== 4) {
return;
}
send.disabled = false;
if (xhr.status === 200) {
try {
var d = JSON.parse(xhr.responseText);
typing.textContent = d.answer || '(no answer)';
} catch (err) {
typing.textContent = 'Error reading response.';
}
} else {
try {
var e = JSON.parse(xhr.responseText);
typing.textContent = e.answer || ('Error ' + xhr.status);
} catch (err) {
typing.textContent = 'Error ' + xhr.status;
}
}
};
xhr.send(JSON.stringify({ message: q }));
}

// Run after DOM ready
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', buildUI);
} else {
buildUI();
}
})();

MediaWiki:Common.css

Ronald — Fri, 04 Sep 2026 09:19:08 GMT

add chat widget

New page

/* Retina Chip Wiki chat widget styles (wiki3.rohmega.com) */

#rmg-chat-toggle {
position: fixed;
bottom: 20px;
right: 20px;
width: 56px;
height: 56px;
border-radius: 50%;
border: none;
background: #3366cc;
color: #fff;
font-size: 26px;
cursor: pointer;
box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
z-index: 10000;
line-height: 1;
}
#rmg-chat-toggle:hover {
background: #2a55aa;
}

#rmg-chat-panel {
position: fixed;
bottom: 88px;
right: 20px;
width: 340px;
max-width: 90vw;
height: 460px;
max-height: 70vh;
background: #fff;
border: 1px solid #ccc;
border-radius: 12px;
box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
display: flex;
flex-direction: column;
z-index: 10000;
overflow: hidden;
}

#rmg-chat-head {
background: #3366cc;
color: #fff;
padding: 10px 14px;
font-weight: bold;
display: flex;
justify-content: space-between;
align-items: center;
font-size: 14px;
}
#rmg-chat-head button {
background: none;
border: none;
color: #fff;
font-size: 22px;
cursor: pointer;
line-height: 1;
}

#rmg-chat-msgs {
flex: 1;
overflow-y: auto;
padding: 12px;
display: flex;
flex-direction: column;
gap: 8px;
}

.rmg-bubble {
max-width: 85%;
padding: 8px 12px;
border-radius: 14px;
font-size: 14px;
line-height: 1.4;
white-space: pre-wrap;
word-wrap: break-word;
}
.rmg-bubble.user {
align-self: flex-end;
background: #3366cc;
color: #fff;
border-bottom-right-radius: 4px;
}
.rmg-bubble.bot {
align-self: flex-start;
background: #f0f0f0;
color: #222;
border-bottom-left-radius: 4px;
}

#rmg-chat-foot {
display: flex;
border-top: 1px solid #ddd;
padding: 8px;
gap: 6px;
}
#rmg-chat-input {
flex: 1;
border: 1px solid #ccc;
border-radius: 18px;
padding: 8px 14px;
font-size: 14px;
}
#rmg-chat-send {
border: none;
background: #3366cc;
color: #fff;
border-radius: 18px;
padding: 8px 16px;
cursor: pointer;
font-size: 14px;
}
#rmg-chat-send:disabled {
opacity: 0.5;
cursor: default;
}

Block:SC LPF RC1.9