HMC313 output matching w/Evaluation Board

Question

Hi all, 
 
 Our cust evaluated the HMC313E w/ 104217-HMC313. 
 
 Attached the file is result of evaluation @ Gain & Return Loss. 
 Target frequency is 5.8GHz, but gain is degraduation. 
 
 We checked the following thread. 
 https://ez.analog.com/rf/f/q-a/73147/hmc313-matching-app-note 
 https://ez.analog.com/rf/f/q-a/71824/hmc313-evaluation-board-problem 
 https://ez.analog.com/rf/f/q-a/73574/hmc313-test-data-in-the-datasheet-and-evaluation-board 
 
 They replaced the Materials for Evaluation PCB for 5.8GHz matching. 
 C1 - C2 100 pF Capacitor, 0402 Pkg. >>>22pF C3 100 pF Capacitor, 0805 Pkg. >>>22pF L1 22 nH Inductor, 0805 Pkg. >>>12nH R1 22 Ω Resistor, 0805 Pkg. 
 
 But result is same! 
 Please advise us for 5.8GHz matching, DC block and RF choke. 
 
 Best regards, 
 sss

DanO2 · Accepted Answer

Hi sss@jpn, 
 The layout for the original EVB was not correct in my opinion. It had a T-stub inductor connection, when the bias inductor should really land on the output line. 
 
 We recommended something similar to the ADL5535 layout (linked below). 
 https://www.analog.com/media/en/technical-documentation/evaluation-documentation/ADL5535_a01907a_Gerber.zip 
 Thanks, 
 DanO

DanO2 · Answer

Above is a plot of the data taken and a picture of the alternate board we put the HMC313 on. I will provide you specific details soon. 
 
 -DanO

DanO2 · Answer

Hi sss@jpn, 
 What is the bandwidth at 5.8GHz (100MHz, 200MHz, etc.)? I am suspicious that the 0805 12nH inductor at L1 might be affecting the high frequency response. We will run some simulations once you get back to me about the bandwidth. 
 Thanks, 
 DanO

DanO2 · Answer

Hi sss@jpn, 
 
 We have ran some tests in the lab and got the same results that you have. We are now investigating to figure out whether the issue is with the board or the device itself. In the mean time I would suggest the ADL5544 as an adequate replacement. 
 
 I apologize for this inconvenience, 
 
 DanO

DanO2 · Answer

Hi sss@jpn, 
 Just a follow-up, we have discovered the HMC313 is not the problem, it is an eval board issue. The part was characterized with a different eval board than it currently resides on. We attached the HMC313 to a different eval board and the problem seems to be resolved. We will be re-spinning the evaluation board to correct this problem. 
 
 Thanks, 
 DanO

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HMC313 output matching w/Evaluation Board

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