HMC907 Power Supply connection.


Datasheet for HMC907 says that pin №21 is RF output for amplifier and connect DC bias (Vdd) network to provide drain current (Idd). Also Drain Bias (Vdd) must be applied through a broadband bias tee or external bias network. And there are only 2 pin that not grounded or not NC.

But scheme for Ev board shows that pins №2, 13, 15, 29, 30 need to be connected to something and 21 pin has no connect to DC source. And there are no descriptions in datasheet  about these pins.

So what is right and wrong and what application circuit?

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[edited by: AndreyBugaev at 11:43 AM (GMT 0) on 11 Sep 2019]