ADF4355BCPZ datasheet(35/36 Pages) AD

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35 / 36 page

ADF4355

Data Sheet

Rev. A | Page 34 of 35

OUTPUT MATCHING

The low frequency output can simply be ac-coupled to the next

circuit, if desired; however, if higher output power is required,

use a pull-up inductor to increase the output power level.

7.5nH

100pF

RFOUTA+

VRF

50Ω

Figure 46. Optimum Output Stage

When differential outputs are not needed, terminate the unused

output or combine it with both outputs using a balun.

For lower frequencies below 2 GHz, it is recommended to use a

100 nH inductor on the RFOUTA+/RFOUTA− pins.

The RFOUTA+/RFOUTA− pins are a differential circuit. Provide

each output with the same (or similar) components where

possible, such as the same shunt inductor value, bypass

capacitor, and termination.

The auxiliary frequency output, RFOUTB+/RFOUTB−, can be

treated the same as the RFOUTA+/RFOUTA− output. If unused,

leave both RFOUTB+/RFOUTB− pins open.

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