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4 Current Loop Filter Configuration
Note that if the phase detector frequency is changed significantly, the loop filter needs to be redesigned.
For detailed design and simulation, see the
For application notes, videos, and other technical information on TI products, see http://www.ti.com/pll.
SNAU218A – NOVEMBER 2018 – REVISED AUGUST 2022
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Table 4-1. Current Loop Filter Configuration
PARAMETER
VCO Gain
Loop Bandwidth
Phase Margin
C1_LF
C2_LF
C3_LF
C4_LF
R2
R3_LF
R4_LF
Effective Charge Pump Gain
Phase Detector Frequency (MHz)
VCO Frequency
Figure 4-1. Current Loop Filter Configuration
PLLatinum Sim
Copyright © 2022 Texas Instruments Incorporated
VALUE
132 MHz/V
285 kHz
65 deg
390 pF
68 nF
Open
1800 pF
68 Ω
0 Ω
18 Ω
15 mA
200 MHz
Designed for 15 GHz, but works
over the whole frequency range
Tool.
LMX2615EVM-CVAL Wideband 15-GHz Synthesizer
Current Loop Filter Configuration
5
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