how to create barcode in vb.net 2008 Dark Current and Noise Current in Software

Creation ANSI/AIM Code 128 in Software Dark Current and Noise Current

Dark Current and Noise Current
Recognizing Code 128C In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Code 128C Printer In None
Using Barcode generator for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
As can be seen from the noise equation (Equation 2), the total APD dark current (and the corresponding spectral noise current) is only meaningful when specified at a given operating gain. Dark current at M = 1 is dominated by surface current, and may be significantly less than IDB M Since APD dark and spectral noise currents are a strong function of APD gain, these should be specified at a stated responsivity level. An example of a typically correct specification for diode dark current and noise current in this case, for an InGaAs APD is as follows: ID (R = 9.0A/W) = 10 nA (max), M = 10 iN (R = 6.0 A/W, 1 MHz, 1 Hz BW) = 0.8 pA/ Hz (max), M>5
Scan Code 128 Code Set A In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Code 128B Drawer In C#.NET
Using Barcode generation for VS .NET Control to generate, create Code 128A image in VS .NET applications.
Excess Noise Factor
ANSI/AIM Code 128 Drawer In .NET Framework
Using Barcode drawer for ASP.NET Control to generate, create USS Code 128 image in ASP.NET applications.
Code 128 Code Set C Creation In .NET
Using Barcode encoder for .NET framework Control to generate, create Code128 image in VS .NET applications.
All avalanche photodiodes generate excess noise due to the statistical nature of the avalanche process. This excess noise factor is generally denoted as F. As shown in the noise equation (Equation 2), F is the factor by which the statistical noise on the APD current (equal to the sum of the multiplied photocurrent plus the multiplied APD bulk dark current)
Code 128 Creation In VB.NET
Using Barcode creator for .NET Control to generate, create Code-128 image in Visual Studio .NET applications.
Code 39 Full ASCII Generator In None
Using Barcode drawer for Software Control to generate, create Code 39 Full ASCII image in Software applications.
Seven
Painting GTIN - 12 In None
Using Barcode generation for Software Control to generate, create UPC A image in Software applications.
EAN / UCC - 13 Maker In None
Using Barcode printer for Software Control to generate, create EAN / UCC - 13 image in Software applications.
exceeds that which would be expected from a noiseless multiplier on the basis of Poissonian statistics (shot noise) alone. The excess noise factor is a function of the carrier ionization ratio, k, where (k) is usually defined as the ratio of the hole to electron ionization probabilities. The excess noise factor may be calculated using the model developed by McIntyre (3), which considers the statistical nature of avalanche multiplication. The excess noise factor is given by: F = kEFF M + (1 kEFF)(1 1/M) (4)
Bar Code Generation In None
Using Barcode generator for Software Control to generate, create bar code image in Software applications.
Printing EAN13 In None
Using Barcode creator for Software Control to generate, create EAN / UCC - 13 image in Software applications.
Therefore, the lower the values of k and M, the lower the excess noise factor. The effective k factor (kEFF) for an APD can be measured experimentally by fitting the McIntyre formula to the measured dependence of the excess noise factor on gain. This is best done under illuminated conditions. It may also be theoretically calculated from the carrier ionization coefficients and the electric field profile of the APD structure. The ionization ratio k is a strong function of the electric field across the APD structure, and takes its lowest value at low electric fields (only in silicon). Since the electric field profile depends upon the doping profile, the k factor is also a function of the doping profile. Depending on the APD structure, the electric field profile traversed by a photogenerated carrier and subsequent avalanche-ionized carriers may therefore vary according to photon absorption depth. For indirect band gap semiconductors such as silicon, the absorption coefficient varies slowly at the longer wavelengths, and the mean absorption depth is therefore a function of wavelength. The value of kEFF, and gain, M, for a silicon APD is thus a function of wavelength for some doping profiles. The McIntyre formula can be approximated for a k < 0.1 and M > 20 without significant loss of accuracy as: F=2+k M (5)
Bookland EAN Generator In None
Using Barcode creator for Software Control to generate, create Bookland EAN image in Software applications.
Making Matrix 2D Barcode In Visual Basic .NET
Using Barcode generation for .NET Control to generate, create Matrix Barcode image in Visual Studio .NET applications.
Also often quoted by APD manufacturers is an empirical formula used to calculate the excess noise factor, given as: F = Mx (6)
ANSI/AIM Code 128 Decoder In Visual Basic .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
Make UPC - 13 In None
Using Barcode printer for Online Control to generate, create EAN13 image in Online applications.
where the value of X is derived as a log-normal linear fit of measured F-values for given values of gain M. This approximation is sufficiently appropriate for many applications, particularly when used with APDs with a high k factor, such as InGaAs and germanium APDs. Table 7.3 provides typical values of k, X, and F for silicon, germanium, and InGaAs APDs.
UPCA Generation In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create GS1 - 12 image in .NET applications.
Code-128 Scanner In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Industrial Sensors and Control
Decode Data Matrix In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Bar Code Creator In Visual Studio .NET
Using Barcode creator for VS .NET Control to generate, create barcode image in VS .NET applications.
The silicon APDs have three different values of ionization ration: The Super-Low k (SLiK) APDs used in photon counting modules The high-performance reach-through structures with k = 0.02 for applications requiring extremely low noise APD and high gain The low-cost silicon epitaxial APD with k = 0.06 ideal for high SNR applications. In germanium and InGaAs APDs, the k-value is generally quoted at M = 10, which somewhat overestimates F at M < 10 and underestimates F at M > 10.
Copyright © OnBarcode.com . All rights reserved.