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<!DOCTYPE html> |
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<html> |
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<head> |
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<title>Low Pass Filter with LC</title> |
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</head> |
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<body> |
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<svg id="chart1" width="600" height="400"></svg> |
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<img src='LowPassFilter.png'></img> |
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<script src="https://cdn.jsdelivr.net/gh/JerryWiltz/nP@latest/dist/nP.js"></script> |
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<script> |
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// generate frequency list |
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g = nP.global; |
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g.fList = g.fGen(50e6, 6e9, 101); |
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// specify the filter requirements |
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var minRejFreq = 1.5e9; |
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var maxPassFreq = 1.0e9; |
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var passBandRipple = 0.01; |
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var rejLevel = 35; |
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// find the normalized frequency, w |
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var w = minRejFreq/maxPassFreq; |
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// find the number of sections, n, using nP |
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var n = nP.chebyLPNsec(maxPassFreq, minRejFreq, passBandRipple, rejLevel); |
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// determine the lowpass fitler prototype elements, gks, using nP |
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var gk = nP.chebyLPgk(n, passBandRipple); |
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// find the parallel C and series L components using nP |
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var LCcomponents = nP.chebyLPLCs(gk, maxPassFreq); |
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// compute the s-parameters per frequency point of the filter given the LC components |
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var myFilt = nP.lpfGen(LCcomponents); |
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// produce the output |
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var LPF = myFilt.out('s11dB', 's21dB'); |
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// set up the lineChartInputObject |
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var fullInputObject = { |
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inputTable: [LPF], |
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chartID: 'chart1', |
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metricPrefix: 'giga', |
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titleTitle: 'Response of a 1 GHz 9 Section Lowpass LC filter', |
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xAxisTitle: 'Input Frequency, GHz', |
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yAxisTitle: 's11 and and s21, dB', |
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xRange: [0,6e9], |
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yRange: [0,-160], |
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showPoints: 'hide', |
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showLables: 'show' |
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}; |
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// plot the filter response |
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nP.lineChart(fullInputObject); |
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// show the LC components |
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var LC = document.createElement('div'); |
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LC.innerHTML = 'Starts with a parallel capacitor, then with a series inductor, and so on ...' + '<br>'; |
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LCcomponents.forEach(function (element) { |
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LC.innerHTML = LC.innerHTML + element.toString() + '<br>'; |
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}); |
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document.body.appendChild(LC); |
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</script> |
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</body> |
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</html> |
