barcode reader in asp.net codeproject vout in Software

Creation QR Code in Software vout

vout
QR Code ISO/IEC18004 Reader In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Quick Response Code Maker In None
Using Barcode creation for Software Control to generate, create QR Code image in Software applications.
Vref v vin
Read QR Code 2d Barcode In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Denso QR Bar Code Maker In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create QR Code 2d barcode image in VS .NET applications.
and the switching levels for the Schmitt trigger are vin > (1537)
Generating QR Code JIS X 0510 In .NET
Using Barcode maker for ASP.NET Control to generate, create QR Code 2d barcode image in ASP.NET applications.
Denso QR Bar Code Maker In VS .NET
Using Barcode generator for .NET framework Control to generate, create QR Code JIS X 0510 image in .NET applications.
+ R1 vout
Encode QR Code 2d Barcode In VB.NET
Using Barcode drawer for VS .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
Code 39 Full ASCII Printer In None
Using Barcode creator for Software Control to generate, create Code-39 image in Software applications.
for the positive-going transition, and vin < (1538)
Creating USS-128 In None
Using Barcode creation for Software Control to generate, create GS1-128 image in Software applications.
Bar Code Creation In None
Using Barcode printer for Software Control to generate, create barcode image in Software applications.
R2 Vref
Encode DataMatrix In None
Using Barcode generation for Software Control to generate, create DataMatrix image in Software applications.
EAN13 Drawer In None
Using Barcode creator for Software Control to generate, create UPC - 13 image in Software applications.
for the negative-going transition In effect, the Schmitt trigger provides a noiserejection range equal to [R2 /(R2 + R1 )]Vsat within which the comparator cannot switch Thus, if the noise amplitude is contained within this range, the Schmitt trigger will prevent multiple triggering Figure 1450 depicts the response of a Schmitt trigger with appropriate switching thresholds to a noisy waveform Example 1513 provides a numerical illustration of this process Data sheets for Schmitt triggers may be found in the accompanying CD-ROM
Make Intelligent Mail In None
Using Barcode encoder for Software Control to generate, create 4-State Customer Barcode image in Software applications.
Barcode Encoder In None
Using Barcode maker for Office Excel Control to generate, create barcode image in Microsoft Excel applications.
Figure 1549 Schmitt trigger (general circuit)
EAN-13 Supplement 5 Printer In None
Using Barcode drawer for Word Control to generate, create GTIN - 13 image in Office Word applications.
Code 3 Of 9 Creation In None
Using Barcode generation for Excel Control to generate, create Code 39 Full ASCII image in Office Excel applications.
15
Data Matrix Creation In None
Using Barcode maker for Online Control to generate, create Data Matrix image in Online applications.
EAN 13 Maker In C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create EAN 13 image in .NET framework applications.
Electronic Instrumentation and Measurements
Drawing Linear Barcode In VB.NET
Using Barcode generation for VS .NET Control to generate, create 1D Barcode image in Visual Studio .NET applications.
Barcode Recognizer In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
2 Volts 0 0 01 02 03 05 06 Time, s Noisy input waveform 04 07 08 09 1
20 Volts 0 0 01 02 03 05 06 07 Time, s Schmitt trigger output waveform 04 08 09 1
Figure 1550 Schmitt trigger response to noisy waveforms
EXAMPLE 1513 Analysis and Design of Schmitt Trigger
Problem
vin V+ S R3 v+ R2 +
VS
v
V+ S
Find the required resistor values for the Schmitt trigger circuit shown in Figure 1551
vout
Solution
Known Quantities: Supply voltages and supply saturation voltages; reference voltage (offset); noise amplitude Find: R1 , R2 , R3
Figure 1551 Schmitt trigger
Vref = 2 V
Schematics, Diagrams, Circuits, and Given Data: |VS | = 18 V; |Vsat | = 165 V; Assumptions: |vnoise | = 100 mV
Analysis: We rst observe that the offset voltage has been obtained by tying two resistors, forming a voltage divider, between the positive supply voltage and ground This procedure avoids requiring a separate reference voltage source From the circuit of Figure 1551 we can calculate the noninverting voltage to be:
v+ =
R2 R2 vout + V+ R1 + R 2 R2 + R 3 S
Since the required noise protection level (the width of the transfer characteristic, symmetrically place about Vref in Figure 1549) is V = 100 mV, we can compute R1 and R2 from R2 R2 v = Vsat = 165 = 01 V 2 R1 + R 2 R1 + R 2 or 01 R2 = R1 + R 2 165 The top half of Figure 1552 depicts the 100 mV noise protection band around the reference voltage If we select a large value for one of the resistors, say, R1 = 100 k , we can calculate R2 610
Part II
Electronics
To determine R3 , we note that Vref = or 2= 610 18 610 + R3 R2 V+ R2 + R3 S
and calculate R3 = 488 k The design is complete The transfer characteristic of the comparator and the associated waveforms are shown in Figure 1552
vout (V) 165 vin Vref 21 vin (V) 0 vout 0 vout 0 V Noisy signal t Conventional comparator t Schmitt trigger
165
Figure 1552 Schmitt trigger waveforms and transfer characteristics
Comments: In Figure 1552 the Schmitt trigger output is compared to that of a comparator without noise protection Note that a common comparator would be triggered twice in the presence of noise Focus on Computer-Aided Tools: The Electronics Workbench solution of this example may be found in the accompanying CD-ROM
The Op-Amp Astable Multivibrator This section describes an op-amp circuit useful in the generation of timing, or clock, waveforms In the previous discussion, it was shown how it is possible to utilize positive feedback in a Schmitt trigger circuit A small fraction of the large output saturation voltage was used to delay the switching of a comparator to make it less sensitive to random uctuations in the input signal A very similar circuit can be employed to generate a square-wave signal of xed period and amplitude This circuit is called an astable multivibrator, because it periodically switches between two states without ever reaching a stable state The circuit is shown in Figure 1553 in a somewhat simpli ed form The analysis of the circuit is similar to that of the Schmitt trigger, except for the presence of both negative and positive feedback connections We start by postulating that the op-amp output is saturated at the positive supply saturation voltage One can easily verify that, in this case, the noninverting terminal voltage is R2 vout (1539) v+ = R2 + R 3
R1 IF + VC C v v+ + VS R3 R2 vout V+ S
Figure 1553 Simpli ed op-amp astable multivibrator
15
Electronic Instrumentation and Measurements
and that the voltage at the inverting input is equal to the voltage across the capacitor, vC One can write an expression for the inverting terminal voltage, v , by noting that the capacitor charges at a rate determined by the feedback resistance and by the capacitance, according to the time constant: = R1 C (1540)
Since the current owing into the inverting terminal is negligible, the inverting input voltage is in effect given by v (t) = vC (t) = Vsat (1 e t/ ) (1541)
Copyright © OnBarcode.com . All rights reserved.