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The majority of frequency synthesis is derived from the phase-locked loop Figure 51 demonstrates all of the vital circuits that make up a common singleloop PLL synthesizer: A low-frequency crystal oscillator feeds a reference frequency into the R divider, which decreases the reference frequency to equal the desired fCOM out of the N adjustable frequency divider, with the R divider allowing for different channel spacings The reference frequency out of the R divider is then inserted into the phase comparator, which compares the phase of the R divider to that of the N adjustable frequency divider The adjustable N frequency divider receives its own input frequency from the VCO s output, dropping it down to a lower frequency that must be equal to the R divider s output As the phase comparator is comparing the two frequencies at its input from the N and R dividers to see if they are of the same phase, it will produce a rectified .net upc-a reader . NET Barcode Reader Library | C# & VB. NET UPC-A Recognition ...
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How to scan and read UPC-A barcode image in . NET windows and web applications using Barcode Reader Component for . NET ; provide APIs for various . NET ... Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website . AS A MATTER OF FACT The number values in the HSB or RGB fields of the Color Picker can be useful if you re trying to precisely match colors; otherwise, you can ignore them . word aflame upci, birt upc-a, word code 39 barcode font, word barcode font free, word pdf 417, ean 128 word font .net upc-a reader UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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The Universal Product Code ( UPC ) (redundantly: UPC code) is a barcode symbology that is .... read UPC -like labels with his ring wand. In addition to reading regular labels, he read the large two-page centerfold label in the proposal booklet. DC correction voltage at its output into the low-pass PLL loop filter if these two frequencies differ This filter eliminates any AC variations and noise products, placing the now pure DC directly into the VCO s frequency control input The all-important loop filter is required to filter powerful phase comparator constituents at the comparison frequency (fCOM) and its harmonics, since if these responses actually got through to the VCO they would adversely modify its stability The varactor diode s bias within the VCO is affected by this DC control voltage, which immediately forces the VCO back on frequency if it has drifted off These actions permit a frequency source to be adjustable over many discrete frequencies, but with the stability of the crystal oscillator reference The adjustable N frequency divider of the PLL is usually controlled by the operator through a front radio panel knob, or automatically by system commands A microprocessor will normally supply digital control words to the PLL through a serial, but sometimes even a parallel, bus (see below) to change frequency The microprocessor can also be employed to decode and drive display circuits to inform the radio operator of the exact channel of transmit or receive Premixing (Fig 52) of a synthesizer can be used to obtain a higher frequency from a lower frequency PLL The output of the PLL and a crystal oscillator can be fed into a mixer, and filtered by a bandpass filter to attain the sum of these two frequencies Frequency multiplying of the PLL s output, at the expense of higher phase noise and degraded frequency channel resolution, can also be utilized to increase the PLL s output frequency A widespread manual PLL tuning scheme is shown in the circuit of Fig 53 It has a shaft encoder, a microprocessor, the display with its driver, and a PLL chip with loop filter and VCO Rotated by the radio operator, the tuning knob turns an optical or magnetic encoder that has two voltage outputs, A and B The A output is a square wave in quadrature phase (90 degree phase shifted) to the B square wave output The A output is connected directly to the microprocessor s interrupt line; when the A output from the encoder produces a falling edge, an interrupt will occur The microprocessor will then immediately look at the B output to see if it is a 1 If it is, then the microprocessor considers that the knob has been rotated clockwise The microprocessor will then increment the PLL s N divider by 1, increasing the output frequency, and update the frequency display appropriately However, if B is a 0, then the microprocessor considers that the knob has been rotated counterclockwise, and the microprocessor decrements the PLL s N divider by 1, decreasing its output frequency Even though the PLL circuit in general obviously has many advantages, such as a much higher possible operating frequency than a crystal oscillator, is tunable in discrete steps, and is as stable as the reference source (which is usually a simple 10-MHz crystal oscillator), PLLs are far inferior to crystal sources when it comes to phase noise specifications This can be a problem in digital wireless communications Most PLL chips are of the charge-pump type (Fig 54) The charge pump outputs a current of steady amplitude, but with changeable duty cycle and. .net upc-a reader C#. NET UPC-A Barcode Reader /Scanner Library | How to Read ...
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