ADF7021 datasheet(25/64 Pages) AD

tên linh kiện	ADF7021

Giải thích chi tiết về linh kiện	High Performance Narrow-Band Transceiver IC

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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.

ADF7021 bảng dữ liệu(PDF) 25 Page - Analog Devices