I cannot find an appropriate VCO to generate my frequency, as the ADF4158's Vp, the charge pump power supple is limited to 5.5V. Do you guys have any suggestions? Thanks
You can increase the tuning range of the loop beyond Vp, the charge pump power supply (5.5 V), by using an active loop filter.
Here is a similar circuit which demonstrates the use of an active filter: http://www.analog.com/en/circuits-from-the-lab/CN0174/vc.html
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