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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ADF7021 데이터시트(PDF) 25 Page - Analog Devices |
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ADF7021 데이터시트(HTML) 25 Page - Analog Devices |
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25 / 64 page  Data Sheet ADF7021 Rev. B | Page 25 of 64 CHOOSING CHANNELS FOR BEST SYSTEM PERFORMANCE An interaction between the RF VCO frequency and the reference frequency can lead to fractional spur creation. When the synthesizer is in fractional mode (that is, the RF VCO and reference frequencies are not integer related), spurs can appear on the VCO output spectrum at an offset frequency that corresponds to the difference frequency between an integer multiple of the reference and the VCO frequency. These spurs are attenuated by the loop filter. They are more noticeable on channels close to integer multiples of the reference where the difference frequency may be inside the loop bandwidth; thus, the name integer boundary spurs. The occurrence of these spurs is rare because the integer frequencies are around multiples of the reference, which is typically >10 MHz. To avoid having very small or very large values in the fractional register, choose a suitable reference frequency. |
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