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pll_loopfilter_calc.php    11367 Bytes    15-09-2021 18:26:11


2nd / 3rd Order Loopfilter Calculator for PLL's V3


RF-Tools



3rd Order Loop Filter


Output Frequency

  MHz

 

Reference Frequency

  MHz

 

Phase Margin

  deg

 

VCO Gain  

  MHz/V

 

Charge Pump Current

  mA

 

Filter Bandwidth

  MHz

 






LOOP FILTER 2nd ORDER


C1

  nF

R2

  kΩ

C2

  nF



LOOP FILTER 3rd ORDER


C1

  nF

Att.

  dB

 

C2

  nF

R2

  kΩ

 

C3

  nF

R3

  kΩ

 

Loop Bandwidth [kHz]   





Notes for Youngplayers :


The Filter Bandwidth should not exceed 5...10% of the Reference Frequency, as oscillation may occur. Use only NP0/COG high quality capacitors for the loop-filter.




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t1 = 6577 d

t2 = 200 ms

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