public Waveform Clone()
{
Waveform newWaveform = new Waveform(this.secondsPerSample, this.maximumDataPoints, this.maximumVoltageForPlots);
for (int i = 0; i < this.maximumDataPoints; i++)
{
newWaveform.data[i] = this.data[i];
}
return(newWaveform);
}
public Waveform ApplySampling(double newSamplingInMhz)
{
checked
{
double totalWaveformTime = this.maximumDataPoints * this.secondsPerSample;
// Calculate parameters for the new waveform and create it
double newSecondsPerSample = 1 / (1E6 * newSamplingInMhz);
double newNumberSamples = totalWaveformTime / newSecondsPerSample;
int newNumberSamplesInt = (int)newNumberSamples; // For debugging
Waveform resultWaveform = new Waveform(secondsPerSample, newNumberSamplesInt, this.maximumVoltageForPlots);
for (int newSampleIndex = 0; newSampleIndex < newNumberSamplesInt; newSampleIndex++)
{
double sampleTime = ((double)newSampleIndex) * newSecondsPerSample;
double oldSampleIndex = sampleTime / this.secondsPerSample;
resultWaveform.data[newSampleIndex] = this.data[(int)oldSampleIndex];
}
return(resultWaveform);
}
}
public Waveform ApplyCompensation(double resistorValue, double capacitorValue, int timestepsPerSample)
{
Waveform resultWaveform = new Waveform(secondsPerSample, maximumDataPoints, this.maximumVoltageForPlots);
double capacitorCharge = 0, capacitorVoltage = 0;
double secondsPerTimeStep = secondsPerSample / timestepsPerSample;
for (int sampleNumber = 0; sampleNumber < maximumDataPoints; sampleNumber++)
{
double inputVoltage = data[sampleNumber];
for (int timeStepNumber = 0; timeStepNumber < timestepsPerSample; timeStepNumber++)
{
double currentThroughResistor = (inputVoltage - capacitorVoltage) / resistorValue;
capacitorCharge = capacitorCharge + currentThroughResistor * secondsPerTimeStep;
capacitorVoltage = capacitorCharge / capacitorValue;
}
resultWaveform.data[sampleNumber] = capacitorVoltage;
}
return(resultWaveform);
}
private void RedrawGraphs(bool replaceData)
{
if (replaceData || (stage1 == null))
{
// Find the time per symbol based on user's selection
double symbolFrequency = 0;
if (signalSource1Button.Checked)
{
symbolFrequency = 480E6;
}
else if (signalSource2Button.Checked)
{
symbolFrequency = 5E9;
}
else if (signalSource3Button.Checked)
{
symbolFrequency = 2.133E9;
}
else
{
string c = DateTime.Now.ToString("h:mm:ss tt");
statusBox.AppendText($"{c} Invalid symbol frequency \r\n");
symbolFrequency = 2E9;
}
double timePerSymbol = 1 / symbolFrequency;
double timePerSample = timePerSymbol / numberSamplesPerSymbol;
int numberSamples = (int)(numberSymbols * numberSamplesPerSymbol);
// CREATE STAGE 1 - Go for 480 Mhz, 2 nanosec/cycle, 10 bits, 20 nsec, 20 samples per bit
stage1 = new Waveform(timePerSample, numberSamples, 250);
Random r = new Random();
int sampleIndex = 0;
for (int symbolNumber = 0; symbolNumber < numberSymbols; symbolNumber++)
{
int symbolValue = r.Next(2); // Upper bound is exclusive, so this is 0 or 1
for (int symbolSample = 0; symbolSample < numberSamplesPerSymbol; symbolSample++)
{
stage1.data[sampleIndex++] = symbolValue * 200;
}
}
}
stage1.PlotWaveform(stage1Chart);
Waveform stage2 = stage1.Clone();
stage2.PlotWaveform(stage2Chart);
// Sample 1k-ohm, 10nF, gives 15.9Khz
// 1 / (2 * pi * RC) = frequency
// RC = (1 / (2 * pi * f)) f=1E9
// RC = 1.59E-10 Assume C = 10 pF
// R = 1.59E-10 / (10E-12)
// R=15.9
// Figure out desired cutoff frequency
double desiredCutoff = -1;
System.Reflection.Assembly thisExe;
thisExe = System.Reflection.Assembly.GetExecutingAssembly();
if (probe1SelectedButton.Checked)
{
desiredCutoff = 4E9;
// probeImage.ImageLocation = @"C:\temp\tek\P7240.png";
System.IO.Stream file =
thisExe.GetManifestResourceStream("PickProbe.Resources.P7240.png");
this.probeImage.Image = Image.FromStream(file);
}
else if (probe2SelectedButton.Checked)
{
desiredCutoff = 2.5E9;
System.IO.Stream file =
thisExe.GetManifestResourceStream("PickProbe.Resources.P7225.png");
this.probeImage.Image = Image.FromStream(file);
}
else if (probe3SelectedButton.Checked)
{
desiredCutoff = 1.5E9;
System.IO.Stream file =
thisExe.GetManifestResourceStream("PickProbe.Resources.P6248.png");
this.probeImage.Image = Image.FromStream(file);
}
else if (probe4SelectedButton.Checked)
{
desiredCutoff = 220E6;
System.IO.Stream file =
thisExe.GetManifestResourceStream("PickProbe.Resources.P2220.png");
this.probeImage.Image = Image.FromStream(file);
}
else if (probe5SelectedButton.Checked)
{
desiredCutoff = 100E6;
System.IO.Stream file =
thisExe.GetManifestResourceStream("PickProbe.Resources.P3010.png");
this.probeImage.Image = Image.FromStream(file);
}
else if (probe6SelectedButton.Checked)
{
double myResult;
if (double.TryParse(probeMhzAlternate.Text, out myResult) == false)
{
return;
}
if (myResult < 1)
{
return;
}
desiredCutoff = myResult * 1E6;
}
string currentTime = DateTime.Now.ToString("h:mm:ss tt");
statusBox.AppendText($"{currentTime} cutoff= {desiredCutoff / 1E6} Mhz\r\n");
statusBox.SelectionStart = statusBox.TextLength;
statusBox.ScrollToCaret();
// Puts below at 100 Mhz
double resistor = 159;
double capacitor = 10E-12;
// Adjust capacitor to desired value
capacitor = capacitor * (100E6 / desiredCutoff); // Higher desired cutoff = lower capacitance
// Create Stage3
Waveform stage3 = stage2.ApplyRCFilter(resistor, capacitor, 20);
stage3.PlotWaveform(stage3Chart);
Waveform stage4 = stage3.Clone();
if (compensationCorrectCompButton.Checked)
{
}
else if (compensationUnderCompButton.Checked)
{
stage4 = stage3.ApplyRCFilter(15.9, 10E-12, 20);
}
else if (compenstationOverCompButton.Checked)
{
Waveform temp = stage3.ApplyRCFilter(15.9, 10E-12, 20);
stage4 = stage3.Clone();
for (int i = 0; i < stage4.maximumDataPoints; i++)
{
stage4.data[i] = stage4.data[i] + (stage3.data[i] - temp.data[i]);
}
}
stage4.PlotWaveform(stage4Chart);
// DO sampling
Waveform stage5 = stage4.ApplySampling(500);
stage5.PlotWaveform(stage5Chart, SeriesChartType.Point);
}