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ADF4377 数据表(PDF) 21 Page - Analog Devices |
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ADF4377 数据表(HTML) 21 Page - Analog Devices |
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21 / 79 page ![]() Data Sheet ADF4377 THEORY OF OPERATION analog.com Rev. 0 | 21 of 79 INTRODUCTION A PLL is a complex feedback system that may conceptually be considered a frequency multiplier. The system multiplies the refer- ence input frequency (fREF) and produces a higher frequency on the clock output pins (fOUT). The PFD, charge pump, output divider, feedback divider, VCO, and external loop filter forms a feedback loop to accurately control the output frequency (see Figure 60). The reference divider or reference doubler is used to set the frequency resolution. Figure 60. PLL Loop Diagram |
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