Frequency offset (reproduced)

Transferred from: http://www.cnblogs.com/ty10114g/p/3609776.html

Unit: (PPM)

PPM representation-per million units (parts per million). When used as a representation of a frequency deviation, it represents the value of the allowable deviation at a specific center frequency, in hertz. The conversion relationship between PPM and Hertz is as follows:

f= (f*ppm)/10^6

Here the PPM is the maximum change value (+/-), F is the center frequency (Hz), and DF is the maximum frequency variation range allowed.

For example: if the frequency of the 100MHz is allowed for the frequency error of the PPM. Using the above formula to derive the frequency change is 10kHz. Then the maximum frequency of the system is 100.01MHz, and the minimum is 99.99 MHz.

Frequency offset (reproduced)