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barcode reader vb.net codeproject Vout in Software
Vout Recognize QR Code 2d Barcode In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Drawing QR Code JIS X 0510 In None Using Barcode creator for Software Control to generate, create QR Code image in Software applications. ZS = RS +
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Amplitude ratio
dB amplitude response of bandpass active filter 20 10
8 6 4 2 0 10 1 100 101 102 103 104 Radian frequency (logarithmic scale) 105 0 10 20 10 1 100 102 103 104 101 Radian frequency (logarithmic scale) 105 Figure 1227 Normalized amplitude response of active bandpass lter
are investigated in the homework problems One remark that should be made in passing, though, pertains to the exclusive use of capacitors in the circuits analyzed thus far One of the advantages of opamp lters is that it is not necessary to use both capacitors and inductors to obtain a bandpass response Suitable connections of capacitors can accomplish that task in an opamp This seemingly minor fact is of great importance in practice, because inductors are expensive to massproduce to close tolerances and exact speci cations and are often bulkier than capacitors with equivalent energystorage capabilities On the other hand, capacitors are easy to manufacture in a wide variety of tolerances and values, and in relatively compact packages, including in integrated circuit form Example 125 illustrates how it is possible to construct active lters with greater frequency selectivity by adding energystorage elements to the design EXAMPLE 125 SecondOrder LowPass Filter
Problem
Determine the closedloop voltage gain as a function of frequency for the opamp circuit of Figure 1228 Solution
Known Quantities: Feedback and source impedances Find: R1 VS
L +
+ Vout
A(j ) = Vout (j ) VS (j ) Schematics, Diagrams, Circuits, and Given Data: R2 C = L/R1 = 0 Assumptions: Assume ideal opamp Analysis: The expression for the gain of the lter of Figure 1228 can be determined by using equation 1245: A(j ) = ZF (j ) Vout (j ) = VS (j ) ZS (j )

