Table 1 below summarizes the four methods for fine-tuning the UFT3G output frequency. Each mechanism manipulates different parts of the device and has different responses.
WDCO mode, Fractional Output Divider (FOD) adjustment, and Pre-Divider Offsets are recommended for dynamic frequency adjustment. Compared to the WDCO mode, the FOD adjustment has the advantage of finer frequency granularity and a faster response time. However, it is limited to output frequencies of 400MHz and below. The Input Pre-Divider mechanism can be used to create very slow, smooth frequency transients that are governed by the digital bandwidth settings.
Refer to application note AN-870 for more details. For other questions not addressed by the knowledge base, please submit a technical support request.