PLL 3rd Order Passive Loop Filter Calculator

A service of Green Bay Professional Packet Radio ®


Maximum output frequency from the VCO  
Desired bandwidth of the PLL  
Reference frequency of the loop  
Desired phase margin of the PLL (30 - 70)     degrees
VCO tuning voltage constant     MHz/Volt
Phase detector/charge pump constant     mA/2*pi*rad
Desired attenuation from the low pass filter     dB

Experimental, based on application notes and equations from Intersil and National.