+

-

LM3243

VBATT_PA

VIN DC-DC

VBATT

+

*

*Proper decoupling on VBATT_PA

is strongly recommended.

*

Star connection at VBATT

VIN

+

-

VBATT_PA

LM3243

www.ti.com

SNVS782B – OCTOBER 2010 – REVISED FEBRUARY 2013

VBATT Star Supply Connection

Figure 32. Multiple Board Layers - VBATT Supply Star Connection

VBATT Star Connection: It is critically important to use a ‘Star’ connection from VBATT supply to LM3243 PVIN

and from VBATT to PA modules as implementing a ‘daisy chain’ supply connection may add noise to the PA

output.

Figure 33. VBATT Star Connection on VIN and VBATT_PA

Copyright © 2010–2013, Texas Instruments Incorporated

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