Data Sheet

ADRF5347

APPLICATION INFORMATION

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Rev. 0 | 14 of 15

BACK-TO-BACK PHASE SHIFTER REFERENCE DESIGN

Figure 29. Back-to-Back Configuration Schematic

A typical application of the ADRF5347 is a four-step phase shifter

achieved by connecting the SP4T switches back to back. Each RF

arm may have a different delay line (Figure 29).

The switch control inputs, V1 and V2, can be connected together

to configure the back-to-back phase shifter, which is achieved by

applying inverted logic to the LS pin of SW1 and SW2. The LS

pins do not require additional routing due to the internal pull-up.

Therefore, the LS pin of ADRF5347 can be directly tied to ground or

left floating.

Figure 30, Figure 31 and Figure 32 show a reference four-step

phase shifter design with 0°, 30°, 60°, and 90° phases at 3.6

GHz. The plots represent the performance from the first switch's

RFC terminal to the second switch's RF terminal, with reference

planes at the package boundary. The design is implemented on

a low loss, low passive intermodulation substrate Aerowave-300.

Contact Analog Devices Technical Support for design files and

further recommendations.

Figure 30. Back-to-Back Insertion Loss vs. Frequency

Figure 31. Back-to-Back Normalized Phase vs. Frequency

Figure 32. Input and Output Return Loss vs. Frequency