Texas Instruments LMX2594 - 5 Current Loop Filter Configuration

www.ti.com Current Loop Filter Configuration
11
SNAU210–March 2017
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LMX2594 EVM Instructions – 15-GHz Wideband Low Noise PLL With
Integrated VCO
5 Current Loop Filter Configuration
The parameters for the loop filters are:
Table 2. 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 10. Current Loop Filter Configuration
For detailed design and simulation, see the PLLatinum Sim Tool.
For application notes, blogs,or videos on our products, see http://www.ti.com/pll.