ADL9005, ADL9006, and HMC998APM5E

Question

I would like to design a 3-stage amplifier using three products from Analog Devices: ADL9005, ADL9006, and HMC998APM5E. 
 As shown in the diagram, I have configured the circuit, and I'm wondering whether the voltage input should be applied in the order indicated by <the red numbers> above. 
 
 Or Is it okay to apply voltage in the order of 12V -> 7.6V/5V -> -0.xxV?

Thank you,

ADIApproved · Accepted Answer

Hi Jorge, 
 With regard to the HMC998APM5E, VGG1, must always be applied first. VGG1, VDD, VGG2is power sequence required to safely bias up the amplifier. If the 12 V is applied first, the HMC998APM5E will be damaged. 
 When powering down the HMC998APM5E turn of VDD first, followed by VGG2 and last turn of VGG1. 
 
 Regards, 
 Jim B)

Dorant · Answer

Hi Jorge, 
 Based on what I see from your bias sequence, indicated by the red number, seem to be fine within your block diagram. Keep in mind that ADL9005 and HMC998 are going to need a bias tee on the output RFOUTVDD1 to operate the drain voltage and a blocking cap at the input as well. 
 Regards, 
 Dorant

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ADL9005, ADL9006, and HMC998APM5E

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