What distinguishes “north‑side” biasing from “south‑side” biasing as outlined in the application section? How does each method affect the amplifier’s performance?

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Answer: 
 
 The ADPA7009‑2 includes internal decoupling capacitors on both the north and south supply pins, so sourcing power from either location produces identical performance — only one needs to be used. 
 Additionally, a SiP development module integrates the HMC980 and ADPA7009, with a DSA at the ADPA7009 input for gain ranging. 
 This SiP provides the complete configuration internally and may serve as a viable alternative to a discrete solution.

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ADPA7009-2: FAQ