HMC313 matching app note

Question

Good day. 
 On HMC313 product page, it is said " The HMC313(E) is a GaAs InGaP Heterojunction Bipolar Transistor (HBT) MMIC amplifier that operates from a single Vcc supply. The surface mount SOT26 amplifier can be used as a broadband gain stage or used with external matching for optimized narrow band applications. With Vcc biased at +5V, the HMC313(E) offers 17 dB of gain and +15 dBm of saturated power while only requiring 50 mA of current. The “HMC313 Biasing and Impedance Matching Techniques” application note available within the “Application Notes” section offers recommendations for narrow band operation. " 
 Where I can find this APP note? 
 Thank you.

ADIApproved · Accepted Answer

Hi ProNick, 
 I would start with DC block caps: 22pF, and RF choke: 12 nH. then tune the RF choke if needed. 
 Best, 
 Kagan

ADIApproved · Answer

Hi zsb, 
 Typically the gain at 5.2GHz is about 2 dB lower than the gain at 3.7 GHz. 
 It would be better to understand if the device itself or the external components are the source of the problem. 
 Did you check the bias values are consistent with the datasheet? What are the Vcc and Icc values? What is the input power level? 
 Did you measure the bias tee you are using alone to see its response? Using a broadband RF choke should reduce the delta from 9dB to 2 dB range. A conical inductor or a 590nH from coilcraft 0402DF series can help. 
 Best, 
 Kagan

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HMC313 matching app note