Texas Instruments LMX2615EVM-CVAL, User Manual

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Current Loop Filter Configuration
7 SNAU218 – November 2018
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LMX2615EVM-CVAL Wideband 15-GHz Synthesizer
4 Current Loop Filter Configuration
Note that if the phase detector frequency is changed significantly, the loop filter needs to be redesigned.
Table 1. Current Loop Filter Configuration
PARAMETER VALUE
VCO Gain 132 MHz/V
Loop Bandwidth 285 kHz
Phase Margin 65 deg
C1_LF 390 pF
C2_LF 68 nF
C3_LF Open
C4_LF 1800 pF
R2 68 Ω
R3_LF 0 Ω
R4_LF 18 Ω
Effective Charge Pump Gain 15 mA
Phase Detector Frequency (MHz) 200 MHz
VCO Frequency
Designed for 15 GHz, but works
over the whole frequency range
Figure 5. Current Loop Filter Configuration
For detailed design and simulation, see the PLLatinum Sim Tool .
For application notes, videos, and other technical information on TI products, see http://www.ti.com/pll .