/// <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>
/// 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>
/// Generates a new set for the CDM voltage, interpolated from the JS-002 specification.
/// </summary>
/// <param name="cdmVoltage">The voltage of the CDM pulse waveform (polarity is ignored, absolute value will be used)</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>A new set for the CDM voltage, interpolated from the JS-002 specification</returns>
private static CDMJS002WaveformCharacteristicsSet GenerateSetForCDMVoltageAndCharacteristics(double cdmVoltage, bool isLargeTarget, bool oscilloscopeIsHighBandwidth)
{
double absCDMVoltage = System.Math.Abs(cdmVoltage);
List <CDMJS002WaveformCharacteristicsSet> possibleSets =
(from set in CDMJS002WaveformCharacteristics.characteristicSets
where set.IsLargeTarget == isLargeTarget && set.IsHighBandwidth == oscilloscopeIsHighBandwidth
select set).ToList();
if (possibleSets.Any(set => set.TestCondition == absCDMVoltage))
{
// If the voltage is an exact match to a set, use it
return(possibleSets.First(set => set.TestCondition == absCDMVoltage).Clone());
}
else
{
// The voltage isn't an exact match to the table, so interpolate it
CDMJS002WaveformCharacteristicsSet below = null;
CDMJS002WaveformCharacteristicsSet above = null;
// Try to find the closest sets that are below and above the Test Condition voltage
foreach (CDMJS002WaveformCharacteristicsSet set in possibleSets)
{
if (set.TestCondition < absCDMVoltage)
{
if (below == null || below.TestCondition < set.TestCondition)
{
below = set;
}
}
else
{
if (above == null || above.TestCondition > set.TestCondition)
{
above = set;
}
}
}
if (below != null && above != null)
{
// Interpolate between the below and above table entries
double percentWithinRange = DoubleRangeExtensions.PercentWithinRange(absCDMVoltage, above.TestCondition, below.TestCondition);
// Only the Peak Current varies between different Test Conditions.
// All other properties are constant for a given target size and bandwidth.
Tuple <double, double> interpolatedPeakCurrent = new Tuple <double, double>(
DoubleRangeExtensions.EquivalentValueInNewRange(percentWithinRange, 1, 0, above.PeakCurrent.Item1, below.PeakCurrent.Item1),
DoubleRangeExtensions.EquivalentValueInNewRange(percentWithinRange, 1, 0, above.PeakCurrent.Item2, below.PeakCurrent.Item2));
return(new CDMJS002WaveformCharacteristicsSet()
{
IsHighBandwidth = below.IsHighBandwidth,
IsLargeTarget = below.IsLargeTarget,
TestCondition = absCDMVoltage,
PeakCurrent = interpolatedPeakCurrent,
RiseTimeMax = below.RiseTimeMax,
FullWidthAtHalfMaximum = new Tuple <double, double>(below.FullWidthAtHalfMaximum.Item1, below.FullWidthAtHalfMaximum.Item2),
UndershootMaxPercent = below.UndershootMaxPercent,
});
}
else if (below != null)
{
// The CDM voltage is higher than the highest table entry, so scale the largest one
double multiplier = absCDMVoltage / below.TestCondition;
// Only the Peak Current varies between different Test Conditions.
// All other properties are constant for a given target size and bandwidth.
Tuple <double, double> scaledPeakCurrent = new Tuple <double, double>(
below.PeakCurrent.Item1 * multiplier,
below.PeakCurrent.Item2 * multiplier);
return(new CDMJS002WaveformCharacteristicsSet()
{
IsHighBandwidth = below.IsHighBandwidth,
IsLargeTarget = below.IsLargeTarget,
TestCondition = absCDMVoltage,
PeakCurrent = scaledPeakCurrent,
RiseTimeMax = below.RiseTimeMax,
FullWidthAtHalfMaximum = new Tuple <double, double>(below.FullWidthAtHalfMaximum.Item1, below.FullWidthAtHalfMaximum.Item2),
UndershootMaxPercent = below.UndershootMaxPercent,
});
}
else if (above != null)
{
// The CDM voltage is lower than the lowest table entry, so scale the smallest one
double multiplier = absCDMVoltage / above.TestCondition;
// Only the Peak Current varies between different Test Conditions.
// All other properties are constant for a given target size and bandwidth.
Tuple <double, double> scaledPeakCurrent = new Tuple <double, double>(
above.PeakCurrent.Item1 * multiplier,
above.PeakCurrent.Item2 * multiplier);
return(new CDMJS002WaveformCharacteristicsSet()
{
IsHighBandwidth = above.IsHighBandwidth,
IsLargeTarget = above.IsLargeTarget,
TestCondition = absCDMVoltage,
PeakCurrent = scaledPeakCurrent,
RiseTimeMax = above.RiseTimeMax,
FullWidthAtHalfMaximum = new Tuple <double, double>(above.FullWidthAtHalfMaximum.Item1, above.FullWidthAtHalfMaximum.Item2),
UndershootMaxPercent = above.UndershootMaxPercent,
});
}
else
{
throw new InvalidOperationException("Finding table entries for the CDM voltage " + absCDMVoltage + " failed.");
}
}
}
