<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 14px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      user-select: none;
    }
    
    .controls {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    
    .slider-track-wrap {
      position: relative;
      padding: 0 8px;
    }
    
    input[type="range"] {
      width: 100%;
      accent-color: #22b7ff;
      cursor: pointer;
      height: 6px;
    }
    
    .slider-ticks {
      display: flex;
      justify-content: space-between;
      padding: 0 4px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
    }
    
    .slider-ticks span {
      cursor: pointer;
    }
    .slider-ticks span.active {
      color: #0284c7;
      font-weight: 700;
    }

    .meters {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }
    
    .meter-card {
      background: #f1f5f9;
      border-radius: 8px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      gap: 2px;
      border: 1px solid #e2e8f0;
    }
    
    .meter-label {
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    
    .meter-value {
      font-size: 22px;
      font-weight: 700;
      color: #1e2945;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    
    .meter-sub {
      font-size: 14px;
      font-weight: 500;
      color: #0284c7;
    }

    .graph-wrap {
      width: 100%;
      background: #f8fafc;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      padding: 6px 8px 4px 4px;
    }
    
    svg {
      width: 100%;
      height: auto;
      display: block;
    }
    
    .axis-line { stroke: #cbd5e1; stroke-width: 1.5; }
    .grid-line { stroke: #e2e8f0; stroke-width: 1; stroke-dasharray: 3 3; }
    .gbp-line { stroke: #94a3b8; stroke-width: 1.5; stroke-dasharray: 4 4; }
    .curve-fill { fill: rgba(34, 183, 255, 0.12); }
    .curve-stroke { fill: none; stroke: #22b7ff; stroke-width: 2.5; stroke-linecap: round; }
    .cutoff-line { stroke: #0284c7; stroke-width: 1.5; stroke-dasharray: 3 3; }
    .cutoff-dot { fill: #0284c7; stroke: #ffffff; stroke-width: 2; }
    .axis-text { font-size: 11px; fill: #64748b; font-family: system-ui, sans-serif; }
    .tag-text { font-size: 11px; fill: #0284c7; font-weight: 600; font-family: system-ui, sans-serif; }
    .limit-text { font-size: 10px; fill: #94a3b8; font-weight: 600; font-family: system-ui, sans-serif; }
  </style>
</head>
<body>

  <div class="controls">
    <div class="slider-track-wrap">
      <input type="range" id="gainSlider" min="0" max="4" step="1" value="3">
    </div>
    <div class="slider-ticks" id="ticks">
      <span data-idx="0">1×</span>
      <span data-idx="1">4×</span>
      <span data-idx="2">10×</span>
      <span data-idx="3" class="active">40×</span>
      <span data-idx="4">100×</span>
    </div>
  </div>

  <div class="meters">
    <div class="meter-card">
      <div class="meter-label">Gain (A<sub>CL</sub>)</div>
      <div class="meter-value">
        <span id="gainVal">40×</span>
        <span class="meter-sub" id="gainDb">(32 dB)</span>
      </div>
    </div>
    <div class="meter-card">
      <div class="meter-label">Bandwidth (-3 dB)</div>
      <div class="meter-value">
        <span id="bwVal">100 kHz</span>
      </div>
    </div>
  </div>

  <div class="graph-wrap">
    <svg viewBox="0 0 500 210">
      
      <line x1="55" y1="25" x2="475" y2="25" class="grid-line" />
      <line x1="55" y1="62" x2="475" y2="62" class="grid-line" />
      <line x1="55" y1="100" x2="475" y2="100" class="grid-line" />
      <line x1="55" y1="137" x2="475" y2="137" class="grid-line" />
      
      <line x1="195" y1="15" x2="195" y2="175" class="grid-line" />
      <line x1="335" y1="15" x2="335" y2="175" class="grid-line" />
      <line x1="475" y1="15" x2="475" y2="175" class="grid-line" />

      
      <line x1="55" y1="175" x2="475" y2="175" class="axis-line" />
      <line x1="55" y1="15" x2="55" y2="175" class="axis-line" />

      
      <text x="48" y="178" text-anchor="end" class="axis-text">0 dB</text>
      <text x="48" y="103" text-anchor="end" class="axis-text">20 dB</text>
      <text x="48" y="29" text-anchor="end" class="axis-text">40 dB</text>

      
      <text x="55" y="193" text-anchor="middle" class="axis-text">10 kHz</text>
      <text x="195" y="193" text-anchor="middle" class="axis-text">100 kHz</text>
      <text x="335" y="193" text-anchor="middle" class="axis-text">1 MHz</text>
      <text x="475" y="193" text-anchor="middle" class="axis-text">10 MHz</text>

      
      <path d="M 55,25 L 420,175" class="gbp-line" />
      <text x="290" y="70" class="limit-text" transform="rotate(-23 290 70)">GBP = 4 MHz</text>

      
      <path id="curveArea" class="curve-fill" d="" />
      <path id="curvePath" class="curve-stroke" d="" />

      
      <line id="cutoffLineY" x1="0" y1="0" x2="0" y2="175" class="cutoff-line" />
      <circle id="cutoffDot" cx="0" cy="0" r="4.5" class="cutoff-dot" />
      <text id="cutoffTag" x="0" y="0" text-anchor="middle" class="tag-text">fc</text>
    </svg>
  </div>

  <script>
    const data = [
      { gain: 1, db: 0, bwHz: 4000000, bwStr: "4.0 MHz", gStr: "1×", dbStr: "(0 dB)" },
      { gain: 4, db: 12, bwHz: 1000000, bwStr: "1.0 MHz", gStr: "4×", dbStr: "(12 dB)" },
      { gain: 10, db: 20, bwHz: 400000, bwStr: "400 kHz", gStr: "10×", dbStr: "(20 dB)" },
      { gain: 40, db: 32, bwHz: 100000, bwStr: "100 kHz", gStr: "40×", dbStr: "(32 dB)" },
      { gain: 100, db: 40, bwHz: 40000, bwStr: "40 kHz", gStr: "100×", dbStr: "(40 dB)" }
    ];

    const slider = document.getElementById('gainSlider');
    const ticks = document.querySelectorAll('#ticks span');
    const gainVal = document.getElementById('gainVal');
    const gainDb = document.getElementById('gainDb');
    const bwVal = document.getElementById('bwVal');
    
    const curvePath = document.getElementById('curvePath');
    const curveArea = document.getElementById('curveArea');
    const cutoffDot = document.getElementById('cutoffDot');
    const cutoffLineY = document.getElementById('cutoffLineY');
    const cutoffTag = document.getElementById('cutoffTag');

    const xMinLog = 4; // 10^4 = 10 kHz
    const xMaxLog = 7; // 10^7 = 10 MHz
    const plotLeft = 55;
    const plotRight = 475;
    const plotWidth = plotRight - plotLeft;
    const plotBottom = 175;
    const plotHeight = 150; // 0 to 40 dB

    function freqToX(f) {
      const logF = Math.log10(f);
      return plotLeft + ((logF - xMinLog) / (xMaxLog - xMinLog)) * plotWidth;
    }

    function dbToY(db) {
      return plotBottom - (db / 40) * plotHeight;
    }

    function update(idx) {
      const d = data[idx];
      
      // Update Texts
      gainVal.textContent = d.gStr;
      gainDb.textContent = d.dbStr;
      bwVal.textContent = d.bwStr;

      // Update Ticks
      ticks.forEach((t, i) => {
        t.classList.toggle('active', i === idx);
      });

      // Calculate Bode plot curve: G(f) = A_CL / sqrt(1 + (f/fc)^2)
      const points = [];
      const steps = 60;
      for (let i = 0; i <= steps; i++) {
        const logF = xMinLog + (i / steps) * (xMaxLog - xMinLog);
        const f = Math.pow(10, logF);
        const g = d.gain / Math.sqrt(1 + Math.pow(f / d.bwHz, 2));
        const db = Math.max(0, 20 * Math.log10(g));
        const x = freqToX(f);
        const y = dbToY(db);
        points.push({ x, y });
      }

      const pathStr = points.map((p, i) => (i === 0 ? `M ${p.x.toFixed(1)},${p.y.toFixed(1)}` : `L ${p.x.toFixed(1)},${p.y.toFixed(1)}`)).join(' ');
      curvePath.setAttribute('d', pathStr);

      const areaStr = `${pathStr} L ${plotRight},${plotBottom} L ${plotLeft},${plotBottom} Z`;
      curveArea.setAttribute('d', areaStr);

      // Cutoff point (-3 dB point)
      const fcX = freqToX(d.bwHz);
      const fcY = dbToY(d.db - 3);

      cutoffDot.setAttribute('cx', fcX.toFixed(1));
      cutoffDot.setAttribute('cy', fcY.toFixed(1));

      cutoffLineY.setAttribute('x1', fcX.toFixed(1));
      cutoffLineY.setAttribute('y1', fcY.toFixed(1));
      cutoffLineY.setAttribute('x2', fcX.toFixed(1));
      cutoffLineY.setAttribute('y2', plotBottom);

      cutoffTag.setAttribute('x', fcX.toFixed(1));
      cutoffTag.setAttribute('y', (fcY - 8).toFixed(1));
      cutoffTag.textContent = d.bwStr;
    }

    slider.addEventListener('input', (e) => {
      update(parseInt(e.target.value, 10));
    });

    ticks.forEach(t => {
      t.addEventListener('click', () => {
        const idx = parseInt(t.dataset.idx, 10);
        slider.value = idx;
        update(idx);
      });
    });

    update(3);
  </script>
</body>
</html>

Gain-Bandwidth Product and Closed-Loop Frequency Limits

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      width: 100%;
    }

    .top-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 8px 12px;
      font-size: 13px;
      font-weight: 600;
    }
    .gbp-badge {
      background: #e0f2fe;
      color: #0369a1;
      padding: 3px 8px;
      border-radius: 6px;
      font-size: 12px;
    }

    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }

    .circuit-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 10px;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .circuit-card.non-inv {
      border-color: #3b82f6;
    }
    .circuit-card.inv {
      border-color: #f59e0b;
    }

    .card-title {
      font-size: 14px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
    }
    .badge-blue { background: #dbeafe; color: #1d4ed8; }
    .badge-amber { background: #fef3c7; color: #b45309; }

    .metrics-table {
      display: flex;
      flex-direction: column;
      gap: 6px;
      font-size: 12px;
    }
    .metric-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 4px;
      border-bottom: 1px dashed #f1f5f9;
    }
    .metric-label {
      color: #64748b;
    }
    .metric-val {
      font-weight: 600;
      font-family: ui-monospace, monospace;
    }

    .bw-visual {
      display: flex;
      flex-direction: column;
      gap: 4px;
      margin-top: 4px;
    }
    .bw-header {
      display: flex;
      justify-content: space-between;
      font-size: 11px;
      font-weight: 600;
      color: #475569;
    }
    .bar-track {
      width: 100%;
      height: 18px;
      background: #f1f5f9;
      border-radius: 4px;
      overflow: hidden;
      position: relative;
    }
    .bar-fill {
      height: 100%;
      display: flex;
      align-items: center;
      padding-left: 6px;
      font-size: 11px;
      font-weight: 700;
      color: #ffffff;
      transition: width 0.4s ease;
    }
    .fill-full {
      width: 100%;
      background: #3b82f6;
    }
    .fill-half {
      width: 50%;
      background: #f59e0b;
    }

    .trap-box {
      background: #fffbeb;
      border: 1px solid #fef3c7;
      border-left: 4px solid #f59e0b;
      border-radius: 6px;
      padding: 8px 12px;
      font-size: 12px;
      line-height: 1.4;
      color: #92400e;
    }
    .trap-title {
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 4px;
      margin-bottom: 2px;
    }

    @media (max-width: 440px) {
      .comparison-grid {
        grid-template-columns: 1fr;
      }
    }
  </style>
</head>
<body>

  <div class="top-bar">
    <span>Bandwidth = GBP ÷ Noise Gain</span>
    <span class="gbp-badge">GBP = 1.0 MHz</span>
  </div>

  <div class="comparison-grid">
    
    <div class="circuit-card non-inv">
      <div class="card-title">
        <span>Non-Inverting</span>
        <span class="badge badge-blue">|A<sub>v</sub>| = 1</span>
      </div>

      <div class="metrics-table">
        <div class="metric-row">
          <span class="metric-label">Signal Gain (A<sub>v</sub>)</span>
          <span class="metric-val">+1</span>
        </div>
        <div class="metric-row">
          <span class="metric-label">Noise Gain (G<sub>N</sub>)</span>
          <span class="metric-val">1</span>
        </div>
        <div class="metric-row">
          <span class="metric-label">Cutoff (f<sub>-3dB</sub>)</span>
          <span class="metric-val" style="color:#2563eb;">1.0 MHz</span>
        </div>
      </div>

      <div class="bw-visual">
        <div class="bw-header">
          <span>Bandwidth</span>
          <span>1000 kHz</span>
        </div>
        <div class="bar-track">
          <div class="bar-fill fill-full">100%</div>
        </div>
      </div>
    </div>

    
    <div class="circuit-card inv">
      <div class="card-title">
        <span>Inverting</span>
        <span class="badge badge-amber">|A<sub>v</sub>| = 1</span>
      </div>

      <div class="metrics-table">
        <div class="metric-row">
          <span class="metric-label">Signal Gain (A<sub>v</sub>)</span>
          <span class="metric-val">-1</span>
        </div>
        <div class="metric-row">
          <span class="metric-label">Noise Gain (G<sub>N</sub>)</span>
          <span class="metric-val">1 + 1 = 2</span>
        </div>
        <div class="metric-row">
          <span class="metric-label">Cutoff (f<sub>-3dB</sub>)</span>
          <span class="metric-val" style="color:#d97706;">500 kHz</span>
        </div>
      </div>

      <div class="bw-visual">
        <div class="bw-header">
          <span>Bandwidth</span>
          <span>500 kHz</span>
        </div>
        <div class="bar-track">
          <div class="bar-fill fill-half">50%</div>
        </div>
      </div>
    </div>
  </div>

  <div class="trap-box">
    <div class="trap-title">⚠️ Common Trap</div>
    Inverting amplifiers have <strong>less bandwidth</strong> than non-inverting amplifiers at the same gain magnitude!
  </div>

</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      user-select: none;
    }

    body {
      width: 100%;
      min-height: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 12px 16px;
    }

    .controls {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      margin-bottom: 10px;
      width: 100%;
      max-width: 580px;
    }

    .btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 6px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #1e2945;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn:hover {
      background: #e2e8f0;
    }

    .btn.active {
      background: #22b7ff;
      border-color: #009be5;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(34, 183, 255, 0.35);
    }

    .graph-wrapper {
      width: 100%;
      max-width: 580px;
      position: relative;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }

    .grid-line {
      stroke: #e2e8f0;
      stroke-width: 1;
    }

    .axis-line {
      stroke: #64748b;
      stroke-width: 1.5;
    }

    .tick-label {
      font-size: 11px;
      fill: #64748b;
      font-weight: 500;
    }

    .axis-title {
      font-size: 12px;
      fill: #1e2945;
      font-weight: 700;
    }

    .ol-curve {
      fill: none;
      stroke: #22b7ff;
      stroke-width: 3.5;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    .slope-label {
      font-size: 11px;
      fill: #0284c7;
      font-weight: 700;
      letter-spacing: 0.5px;
    }

    .cl-band {
      fill: rgba(34, 183, 255, 0.12);
      transition: all 0.3s ease;
    }

    .cl-line {
      stroke: #f59e0b;
      stroke-width: 2.5;
      stroke-dasharray: 4 3;
      transition: all 0.3s ease;
    }

    .info-bar {
      margin-top: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 540px;
      padding: 8px 14px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
    }

    .info-stat {
      display: flex;
      gap: 6px;
    }

    .info-label {
      color: #64748b;
      font-weight: 500;
    }

    .info-val {
      color: #1e2945;
      font-weight: 700;
    }
  </style>
</head>
<body>

  <div class="controls">
    <button class="btn active" id="btn-ol" onclick="setMode('open')">Open-Loop</button>
    <button class="btn" id="btn-g100" onclick="setMode('g100')">Gain = 100 (40 dB)</button>
    <button class="btn" id="btn-g10" onclick="setMode('g10')">Gain = 10 (20 dB)</button>
    <button class="btn" id="btn-g1" onclick="setMode('g1')">Unity Gain = 1 (0 dB)</button>
  </div>

  <div class="graph-wrapper">
    <svg viewBox="0 0 540 330">
      <defs>
        <marker id="arrow" viewBox="0 0 10 10" refX="5" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
          <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#64748b"/>
        </marker>
      </defs>

      
      
      <line class="grid-line" x1="65" y1="35" x2="505" y2="35"/>
      <line class="grid-line" x1="65" y1="83" x2="505" y2="83"/>
      <line class="grid-line" x1="65" y1="131" x2="505" y2="131"/>
      <line class="grid-line" x1="65" y1="179" x2="505" y2="179"/>
      <line class="grid-line" x1="65" y1="227" x2="505" y2="227"/>
      <line class="grid-line" x1="65" y1="275" x2="505" y2="275"/>

      
      
      <line class="grid-line" x1="65" y1="35" x2="65" y2="275"/>
      <line class="grid-line" x1="138" y1="35" x2="138" y2="275"/>
      <line class="grid-line" x1="212" y1="35" x2="212" y2="275"/>
      <line class="grid-line" x1="285" y1="35" x2="285" y2="275"/>
      <line class="grid-line" x1="358" y1="35" x2="358" y2="275"/>
      <line class="grid-line" x1="432" y1="35" x2="432" y2="275"/>
      <line class="grid-line" x1="505" y1="35" x2="505" y2="275"/>

      
      <rect id="cl-rect" class="cl-band" x="65" y="35" width="0" height="240" opacity="0"/>

      
      <line id="cl-gain-line" class="cl-line" x1="65" y1="35" x2="65" y2="35" opacity="0"/>
      <line id="cl-cutoff-line" class="cl-line" x1="65" y1="35" x2="65" y2="275" opacity="0"/>

      
      <line class="axis-line" x1="65" y1="275" x2="515" y2="275" marker-end="url(#arrow)"/>
      <line class="axis-line" x1="65" y1="275" x2="65" y2="20" marker-end="url(#arrow)"/>

      
      <text class="tick-label" x="55" y="39" text-anchor="end">100</text>
      <text class="tick-label" x="55" y="87" text-anchor="end">80</text>
      <text class="tick-label" x="55" y="135" text-anchor="end">60</text>
      <text class="tick-label" x="55" y="183" text-anchor="end">40</text>
      <text class="tick-label" x="55" y="231" text-anchor="end">20</text>
      <text class="tick-label" x="55" y="279" text-anchor="end">0 dB</text>
      <text class="axis-title" x="20" y="15" transform="rotate(-90 20,15)" text-anchor="end">Gain (dB)</text>

      
      <text class="tick-label" x="65" y="293" text-anchor="middle">10 Hz</text>
      <text class="tick-label" x="138" y="293" text-anchor="middle">100 Hz</text>
      <text class="tick-label" x="212" y="293" text-anchor="middle">1 kHz</text>
      <text class="tick-label" x="285" y="293" text-anchor="middle">10 kHz</text>
      <text class="tick-label" x="358" y="293" text-anchor="middle">100 kHz</text>
      <text class="tick-label" x="432" y="293" text-anchor="middle">1 MHz</text>
      <text class="tick-label" x="505" y="293" text-anchor="middle">10 MHz</text>
      <text class="axis-title" x="505" y="315" text-anchor="end">Frequency (log scale)</text>

      
      
      <path class="ol-curve" d="M 50 35 L 65 35 L 432 275"/>

      
      <text class="slope-label" x="260" y="140" transform="rotate(33 260,140)">-20 dB / decade</text>

      
      
      <circle cx="65" cy="35" r="4.5" fill="#1e2945"/>
      <text x="75" y="28" font-size="12" font-weight="700" fill="#1e2945">DC Open-Loop Gain A₀ (100 dB)</text>

      
      <line x1="65" y1="35" x2="65" y2="48" stroke="#1e2945" stroke-width="1.5"/>
      <text x="75" y="52" font-size="11" font-weight="600" fill="#64748b">Break f_b (10 Hz)</text>

      
      <circle cx="432" cy="275" r="4.5" fill="#22b7ff"/>
      <text x="432" y="258" font-size="12" font-weight="700" fill="#0284c7" text-anchor="middle">f_T = GBP (1 MHz)</text>
      <text x="432" y="270" font-size="10" font-weight="600" fill="#64748b" text-anchor="middle">Unity Gain (0 dB)</text>

      
      <circle id="probe-dot" cx="65" cy="35" r="6" fill="#f59e0b" stroke="#ffffff" stroke-width="2" opacity="0"/>
    </svg>
  </div>

  <div class="info-bar">
    <div class="info-stat">
      <span class="info-label">Gain × Bandwidth:</span>
      <span class="info-val" id="gbp-val">100,000 × 10 Hz = 1 MHz</span>
    </div>
    <div class="info-stat">
      <span class="info-label">Limit:</span>
      <span class="info-val" id="limit-val">f_max = 10 Hz</span>
    </div>
  </div>

  <script>
    const modes = {
      open: {
        btn: 'btn-ol',
        gainDb: 100,
        gainLinear: '100,000',
        bw: '10 Hz',
        x: 65,
        y: 35,
        gbp: '100,000 × 10 Hz = 1 MHz',
        limit: 'f_max = 10 Hz',
        showClosed: false
      },
      g100: {
        btn: 'btn-g100',
        gainDb: 40,
        gainLinear: '100',
        bw: '10 kHz',
        x: 285,
        y: 179,
        gbp: '100 × 10 kHz = 1 MHz',
        limit: 'f_max = 10 kHz',
        showClosed: true
      },
      g10: {
        btn: 'btn-g10',
        gainDb: 20,
        gainLinear: '10',
        bw: '100 kHz',
        x: 358,
        y: 227,
        gbp: '10 × 100 kHz = 1 MHz',
        limit: 'f_max = 100 kHz',
        showClosed: true
      },
      g1: {
        btn: 'btn-g1',
        gainDb: 0,
        gainLinear: '1',
        bw: '1 MHz',
        x: 432,
        y: 275,
        gbp: '1 × 1 MHz = 1 MHz',
        limit: 'f_max = 1 MHz',
        showClosed: true
      }
    };

    function setMode(key) {
      const m = modes[key];
      if (!m) return;

      // Update button styles
      document.querySelectorAll('.btn').forEach(b => b.classList.remove('active'));
      document.getElementById(m.btn).classList.add('active');

      // Update Info
      document.getElementById('gbp-val').textContent = m.gbp;
      document.getElementById('limit-val').textContent = m.limit;

      // SVG Elements
      const rect = document.getElementById('cl-rect');
      const gLine = document.getElementById('cl-gain-line');
      const cLine = document.getElementById('cl-cutoff-line');
      const dot = document.getElementById('probe-dot');

      if (m.showClosed) {
        rect.setAttribute('x', '65');
        rect.setAttribute('y', m.y);
        rect.setAttribute('width', m.x - 65);
        rect.setAttribute('height', 275 - m.y);
        rect.style.opacity = '1';

        gLine.setAttribute('x1', '65');
        gLine.setAttribute('y1', m.y);
        gLine.setAttribute('x2', m.x);
        gLine.setAttribute('y2', m.y);
        gLine.style.opacity = '1';

        cLine.setAttribute('x1', m.x);
        cLine.setAttribute('y1', m.y);
        cLine.setAttribute('x2', m.x);
        cLine.setAttribute('y2', 275);
        cLine.style.opacity = '1';

        dot.setAttribute('cx', m.x);
        dot.setAttribute('cy', m.y);
        dot.style.opacity = '1';
      } else {
        rect.style.opacity = '0';
        gLine.style.opacity = '0';
        cLine.style.opacity = '0';
        dot.style.opacity = '0';
      }
    }
  </script>
</body>
</html>

ELEC-8.2

Aligned learning resources

Related diagrams