SNAU218A November   2018  – August 2022

 

  1.   LMX2615EVM-CVAL Wideband 15-GHz Synthesizer
  2.   Trademarks
  3. 1 Evaluation Board Setup and Description
  4. 2 Setting Up the Software
  5. 3 Bringing LMX2615 to a Lock State
  6. 4 Current Loop Filter Configuration
  7. 5 Typical Phase Noise
  8. 6 Schematic
  9. 7 Bill of Materials
  10. 8 PCB Specifications
  11. 9 Proper Jumper and Switch Positions
    1. 9.1 Reference Pro Board
  12. 10Revision History

4 Current Loop Filter Configuration

Note that if the phase detector frequency is changed significantly, the loop filter needs to be redesigned.

Table 4-1 Current Loop Filter Configuration
PARAMETERVALUE
VCO Gain132 MHz/V
Loop Bandwidth285 kHz
Phase Margin65 deg
C1_LF390 pF
C2_LF68 nF
C3_LFOpen
C4_LF1800 pF
R268 Ω
R3_LF0 Ω
R4_LF18 Ω
Effective Charge Pump Gain15 mA
Phase Detector Frequency (MHz)200 MHz
VCO FrequencyDesigned for 15 GHz, but works over the whole frequency range
GUID-D4CDAE5C-95ED-4CF0-AFAA-721C836CCD04-low.pngFigure 4-1 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.