When using the HMC544A in a frequency synthesizer circuit with separate RF and digital ground planes, should the GND pin be connected to RF ground or digital ground? Is the series resistor for the A and B inputs required?

Question

Accepted Answer

Connect the GND pin to RF ground. You do need to connect your digital and analog grounds together at some point to allow any current that flows into RFC to return to where it came from.

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HMC544A : FAQ