/// <summary>
/// Returns the max allowed CDM Undershoot as a percentage to be within the JS-002 specification
/// </summary>
/// <param name="signedCDMVoltage">The sign value of the CDM pulse waveform</param>
/// <param name="isLargeTarget">A value indicating whether the CDM target is large or not (if not, then it is small)</param>
/// <param name="oscilloscopeIsHighBandwidth">A value indicating whether the oscilloscope is high bandwidth (6GHz+) or not</param>
/// <returns>The max allowed CDM Undershoot as a percentage to be within ESDA/JEDEC joint specification</returns>
public static double UndershootMaxPercent(double signedCDMVoltage, bool isLargeTarget, bool oscilloscopeIsHighBandwidth)
{
CDMJS002WaveformCharacteristicsSet set = CDMJS002WaveformCharacteristics.GenerateSetForCDMVoltageAndCharacteristics(
signedCDMVoltage,
isLargeTarget,
oscilloscopeIsHighBandwidth);
return(set.UndershootMaxPercent);
}
/// <summary>
/// Returns the max allowed CDM Rise Time to be within JS-002 specification
/// </summary>
/// <param name="signedCDMVoltage">The sign value of the CDM pulse waveform</param>
/// <param name="isLargeTarget">A value indicating whether the CDM target is large or not (if not, then it is small)</param>
/// <param name="oscilloscopeIsHighBandwidth">A value indicating whether the oscilloscope is high bandwidth (6GHz+) or not</param>
/// <returns>The max allowed CDM Rise Time to be within JS-002 specification</returns>
public static double RiseTimeMax(double signedCDMVoltage, bool isLargeTarget, bool oscilloscopeIsHighBandwidth)
{
CDMJS002WaveformCharacteristicsSet set = CDMJS002WaveformCharacteristics.GenerateSetForCDMVoltageAndCharacteristics(
signedCDMVoltage,
isLargeTarget,
oscilloscopeIsHighBandwidth);
return(set.RiseTimeMax);
}
/// <summary>
/// Calculates the Undershoot related values
/// </summary>
/// <param name="undershootMaxTimeFWHMMultiplier">(Optional) The multiplier of the FWHM time to determine how long after the peak current time to search for undershoot (Default: 2.5x)</param>
private void CalculateUndershoot(double undershootMaxTimeFWHMMultiplier = 2.5)
{
if (undershootMaxTimeFWHMMultiplier <= 0)
{
throw new ArgumentOutOfRangeException("The Undershoot Max Time multiplier cannot be less than or equal to 0");
}
// Determine how much time after the max data point of the waveform to keep for Undershoot
double timeForUndershootDetectionAfterMaxTime = this.FullWidthHalfMaxValue * undershootMaxTimeFWHMMultiplier;
// Add the undershoot allowed time to the max data point time
double endTimeForUndershootDetection = this.PeakCurrentDataPoint.X + timeForUndershootDetectionAfterMaxTime;
// Trim the waveform, removing everything before the max peak
Waveform absoluteWaveformAfterPeakCurrentTime = this.AbsoluteWaveform.TrimStart(this.PeakCurrentDataPoint.X);
// Trim the end of the waveform from the max time until 2.5x the FWHM time
Waveform absoluteUndershootApplicableWaveform = absoluteWaveformAfterPeakCurrentTime.TrimEnd(endTimeForUndershootDetection);
// Find the (absolute) undershoot data point of the absolute Current waveform after the max time
DataPoint absoluteUndershootDataPoint = absoluteUndershootApplicableWaveform.Minimum();
// Look up what the undershoot max percent can be (it is a negative value)
this.UndershootAllowedMaximumPercent = CDMJS002WaveformCharacteristics.UndershootMaxPercent(this.SignedVoltage, this.IsLargeTarget, this.OscilloscopeIsHighBandwidth);
// Calculate what the maximum undershoot value can be (it is a negative number since we are referring to undershoot)
this.UndershootAllowedMaximumValue = this.PeakCurrentValue * this.UndershootAllowedMaximumPercent;
// Convert the absolute undershoot value to the signed value
double absoluteUndershootValue = absoluteUndershootDataPoint.Y;
// If the absolute undershoot is greater than zero, set it to zero. Otherwise set it to the signed value
if (absoluteUndershootValue > 0)
{
this.UndershootValue = 0;
}
else
{
this.UndershootValue = absoluteUndershootValue.InvertValueIfNegativePolarity(this.WaveformIsPositivePolarity);
}
// Determine if the Undershoot is passing
if (this.WaveformIsPositivePolarity)
{
this.UndershootIsPassing = this.UndershootValue >= this.UndershootAllowedMaximumValue;
}
else
{
this.UndershootIsPassing = this.UndershootValue <= this.UndershootAllowedMaximumValue;
}
// Create the undershoot signed Data Point
this.UndershootDataPoint = absoluteUndershootDataPoint.InvertYValueIfNegativePolarity(this.WaveformIsPositivePolarity);
}
/// <summary>
/// Returns the nominal (Item1), min (Item2), and max (Item3) allowed CDM Full Width at Half Maximum to be within the JS-002 specification
/// </summary>
/// <param name="signedCDMVoltage">The sign value of the CDM pulse waveform</param>
/// <param name="isLargeTarget">A value indicating whether the CDM target is large or not (if not, then it is small)</param>
/// <param name="oscilloscopeIsHighBandwidth">A value indicating whether the oscilloscope is high bandwidth (6GHz+) or not</param>
/// <returns>The nominal (Item1), min (Item2), and max (Item3) allowed CDM Full Width at Half Maximum to be within the JS-002 specification</returns>
public static Tuple <double, double, double> FullWidthHalfMaxNominalMinMax(double signedCDMVoltage, bool isLargeTarget, bool oscilloscopeIsHighBandwidth)
{
CDMJS002WaveformCharacteristicsSet set = CDMJS002WaveformCharacteristics.GenerateSetForCDMVoltageAndCharacteristics(
signedCDMVoltage,
isLargeTarget,
oscilloscopeIsHighBandwidth);
return(new Tuple <double, double, double>(
DoubleRangeExtensions.CenterOfRange(set.FullWidthAtHalfMaximum.Item1, set.FullWidthAtHalfMaximum.Item2),
set.FullWidthAtHalfMaximum.Item1,
set.FullWidthAtHalfMaximum.Item2));
}
/// <summary>
/// Calculates the Full Width at Half Max related values
/// </summary>
/// <param name="fullWidthHalfMaxPercent">(Optional) The threshold of where to measure the FWHM as a percent of the peak current (Default: 50%)</param>
private void CalculateFullWidthAtHalfMax(double fullWidthHalfMaxPercent = 0.5)
{
if (fullWidthHalfMaxPercent <= 0.0 || fullWidthHalfMaxPercent >= 1.0)
{
throw new ArgumentOutOfRangeException("The Full Width Half Max Percentage cannot be less than or equal to 0% or greater than or equal to 100%");
}
// Calculate what the half-max current value is (default is 50% of max amplitude)
double fullWidthHalfMaxCurrentSigned = this.PeakCurrentValue * fullWidthHalfMaxPercent;
double fullWidthHalfMaxCurrentAbsolute = fullWidthHalfMaxCurrentSigned.InvertValueIfNegativePolarity(this.WaveformIsPositivePolarity);
// Find the first (interpolated) data point that is on the rising edge of the initial spike (of the absolute value waveform)
DataPoint?fullWidthHalfMaxRisingAbsoluteDataPoint = this.AbsoluteWaveform.DataPointAtYThreshold(fullWidthHalfMaxCurrentAbsolute, true);
if (fullWidthHalfMaxRisingAbsoluteDataPoint.HasValue)
{
// Convert the rising data point to the signed value
this.FullWidthHalfMaxStartDataPoint = fullWidthHalfMaxRisingAbsoluteDataPoint.Value.InvertYValueIfNegativePolarity(this.WaveformIsPositivePolarity);
// Trim the waveform, removing everything before the max peak
Waveform absoluteWaveformAfterPeakCurrentTime = this.AbsoluteWaveform.TrimStart(this.PeakCurrentDataPoint.X);
// Find the first (interpolated) data point that is on the falling edge of the initial spike (of the absolute value waveform)
DataPoint?fullWidthHalfMaxFallingDataPointAbsolute = absoluteWaveformAfterPeakCurrentTime.DataPointAtYThreshold(fullWidthHalfMaxCurrentAbsolute, true);
if (fullWidthHalfMaxFallingDataPointAbsolute.HasValue)
{
// Convert the falling data point to the signed value
this.FullWidthHalfMaxEndDataPoint = fullWidthHalfMaxFallingDataPointAbsolute.Value.InvertYValueIfNegativePolarity(this.WaveformIsPositivePolarity);
// Find the full width half max time
this.FullWidthHalfMaxValue = this.FullWidthHalfMaxEndDataPoint.X - this.FullWidthHalfMaxStartDataPoint.X;
// Determine the min and max values for the Full Width Half Max to be passing
Tuple <double, double, double> nomMinMaxFullWidthHalfMax = CDMJS002WaveformCharacteristics.FullWidthHalfMaxNominalMinMax(this.SignedVoltage, this.IsLargeTarget, this.OscilloscopeIsHighBandwidth);
this.FullWidthHalfMaxAllowedMinimum = nomMinMaxFullWidthHalfMax.Item2;
this.FullWidthHalfMaxAllowedMaximum = nomMinMaxFullWidthHalfMax.Item3;
// Determine if the Full Width Half Max is passing
this.FullWidthHalfMaxIsPassing = DoubleRangeExtensions.BetweenInclusive(this.FullWidthHalfMaxAllowedMinimum, this.FullWidthHalfMaxAllowedMaximum, this.FullWidthHalfMaxValue);
}
else
{
// Full Width Half Max falling data point could not be found, no calculations could be made.
}
}
else
{
// Full Width Half Max rising data point could not be found, no calculations could be made.
}
}
/// <summary>
/// Calculates the Peak Current related values
/// </summary>
/// <param name="pointsAroundPeakToAverage">Number of points around the absolute peak to average together (Default: 0)</param>
private void CalculatePeakCurrent(int pointsAroundPeakToAverage)
{
// Calculate the (absolute) Peak Current DataPoint
DataPoint absolutePeakCurrentDataPoint = this.AbsoluteWaveform.Maximum();
List <DataPoint> absWfmDataPoints = this.AbsoluteWaveform.DataPoints.ToList();
int peakIndex = absWfmDataPoints.IndexOf(absolutePeakCurrentDataPoint);
int peakStartIndex = Math.Max(0, peakIndex - pointsAroundPeakToAverage);
int peakStopIndex = Math.Min(absWfmDataPoints.Count - 1, peakIndex + pointsAroundPeakToAverage);
List <DataPoint> peakDataPoints = new List <DataPoint>();
for (int i = peakStartIndex; i <= peakStopIndex; i++)
{
peakDataPoints.Add(absWfmDataPoints[i]);
}
Waveform peakWaveform = new Waveform(peakDataPoints);
double peakCurrent = peakWaveform.Average();
if (!this.WaveformIsPositivePolarity)
{
peakCurrent *= -1.0;
}
// Extract the Peak Current value
this.PeakCurrentValue = peakCurrent;
this.PeakCurrentDataPoint = new DataPoint(absolutePeakCurrentDataPoint.X, peakCurrent);
// Determine the min and max allowed values for the Peak Current to be passing
Tuple <double, double, double> nomMinMaxPeakCurrent = CDMJS002WaveformCharacteristics.PeakCurrentNominalMinMax(this.SignedVoltage, this.IsLargeTarget, this.OscilloscopeIsHighBandwidth);
this.PeakCurrentAllowedMinimum = nomMinMaxPeakCurrent.Item2.InvertValueIfNegativePolarity(this.WaveformIsPositivePolarity);
this.PeakCurrentAllowedMaximum = nomMinMaxPeakCurrent.Item3.InvertValueIfNegativePolarity(this.WaveformIsPositivePolarity);
// Determine if the Peak Current is passing
this.PeakCurrentIsPassing = DoubleRangeExtensions.BetweenInclusive(this.PeakCurrentAllowedMinimum, this.PeakCurrentAllowedMaximum, this.PeakCurrentValue);
}
/// <summary>
/// Calculates the Rise Time related values
/// </summary>
/// <param name="riseTimeStartPercent">Rise Time starting percentage (Default: 90%)</param>
/// <param name="riseTimeEndPercent">Rise Time ending percentage (Default: 10%)</param>
private void CalculateRiseTime(double riseTimeStartPercent, double riseTimeEndPercent)
{
if (riseTimeStartPercent < 0.0 || riseTimeStartPercent >= 1.0)
{
throw new ArgumentOutOfRangeException("The Rise Time Start % cannot be less than 0% or greater than or equal to 100%");
}
if (riseTimeEndPercent <= 0.0 || riseTimeEndPercent > 1.0)
{
throw new ArgumentOutOfRangeException("The Rise Time End % cannot be less than or equal to 0% or greater than 100%");
}
if (riseTimeStartPercent >= riseTimeEndPercent)
{
throw new ArgumentOutOfRangeException("The Rise Time Start % cannot be equal to or greater than the Rise Time End %");
}
// Generate an absolute-value version of the peak current value
double peakCurrentAbsoluteValue = this.PeakCurrentValue.InvertValueIfNegativePolarity(this.WaveformIsPositivePolarity);
// Calculate what the rise time end threshold is (a percentage of peak current)
double riseTimeEndThreshold = peakCurrentAbsoluteValue * riseTimeEndPercent;
// Find the first (interpolated) data point that is at the rise time end threshold (of the absolute value waveform)
DataPoint?riseTimeEndAbsoluteDataPoint = this.AbsoluteWaveform.DataPointAtYThreshold(riseTimeEndThreshold, true);
if (riseTimeEndAbsoluteDataPoint.HasValue)
{
// Convert the first Rise Time Data Point to the signed value
this.RiseTimeEndDataPoint = riseTimeEndAbsoluteDataPoint.Value.InvertYValueIfNegativePolarity(this.WaveformIsPositivePolarity);
// Trim the waveform, removing everything after the Rise Time End Time
Waveform absoluteWaveformUntilRiseTimeEnd = this.AbsoluteWaveform.TrimEnd(this.RiseTimeEndDataPoint.X);
// Calculate what the Rise Time Start Threshold is (a percentage of peak current)
double riseTimeStartThreshold = peakCurrentAbsoluteValue * riseTimeStartPercent;
// Find the last Data Point (interpolated) Data Point that is below the Rise Time Start Threshold (of the absolute trimmed waveform)
DataPoint?riseTimeStartAbsoluteDataPoint = absoluteWaveformUntilRiseTimeEnd.DataPointAtYThreshold(riseTimeStartThreshold, false);
if (riseTimeStartAbsoluteDataPoint.HasValue)
{
// Convert the last Rise Time Data Point to the signed value
this.RiseTimeStartDataPoint = riseTimeStartAbsoluteDataPoint.Value.InvertYValueIfNegativePolarity(this.WaveformIsPositivePolarity);
// Find the Rise Time
this.RiseTimeValue = this.RiseTimeEndDataPoint.X - this.RiseTimeStartDataPoint.X;
// Determine the max allowed Rise Time to be passing
this.RiseTimeAllowedMaximum = CDMJS002WaveformCharacteristics.RiseTimeMax(this.SignedVoltage, this.IsLargeTarget, this.OscilloscopeIsHighBandwidth);
// Determine if the Rise Time is passing
this.RiseTimeIsPassing = this.RiseTimeValue <= this.RiseTimeAllowedMaximum;
}
else
{
// Risetime start data point could not be found, no calculations could be made.
}
}
else
{
// Risetime end data point could not be found, no calculations could be made.
}
}
