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Phase Noise Validation - Integer Mode
5.1
Phase Noise Validation - Fractional Mode
Validate fractional mode phase noise using the following steps:
1. The default loop filter connected on the TRF3722 EVM is an integer mode loop filter. Change integer
loop filter to fractional loop filter DNI R11 and DNI R40, and populate R8 and R10.
2. A 40-kHz bandwidth and 15.36-MHz Fpfd loop filter has been designed using the
tool, available on www.ti.com.
3.
Figure 16
shows the screen shot of a loop filter tool.
4. As an example, use a 3532.9 MHz target frequency.
5. An external reference of 153.6 MHz is used. To use an external reference, make sure to DNI R23,
remove JP4, and populate R25.
14
TRF3722 EVM User's Guide
All manuals and user guides at all-guidesbox.com
Figure 16. Fractional Mode Loop Filter
Copyright © 2014, Texas Instruments Incorporated
www.ti.com
loop filter calculator
SLOU385 – May 2014
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