We have test the ACP & PAE on EVB of HMC8500 as attached. As data, the ACP is insufficient at 30dBm(1W) output power under LTE signal (1.5GHz, 64QAM@20MHz ), which is back off 40dBm(10W) around 10dB. Due to limit dimension of project, DPD can't been used on. In order to improve that, do you have any recommend of input matching on frequency 1.3GHz~1.5GHz or load-pull be provided ? Or others can meet the specification of 35dBm output under LTE @20MHz during 1.3GHz~1.5GHz ? Thanks.
We do not have load-pull data for this part. With respect to the possibility of alternate matching to improve ACP, I will ask a designer for comment and reply soon.
Noted. Due to project kicks off in rush, please help to update as soon.
Are you working with the HMC8500LP5DE or the HMC8500PM5E? In case you are not aware, the LP5DE version has Last Time Buy status, while the PM5E version is the one that is Recommended for New Designs. For that reason we recommend you work with the PM5E, rather than the LP5DE. At this point I'll assume you're working with the PM5E.
Below I summarize what the designer told me:
From what I remember, during product development our matching activities were mainly focused on optimizing to get the best trade-off of Power, Gain, and PAE across the entire operating frequency range...not just within a narrow range such as your 1.3-1.5 GHz.
Because our group does not currently have the capacity to try such optimization, I asked the designer if he thinks it's possible to improve the match such that your ACP target of 40 dBc can be met at Pout=+30 dBm LTE (+35 dBm CW) in the 1.3-1.5 GHz range. He said that, if the measurement results you provided are indeed correct then, optimizing the matching would likely not allow an ACP improvement of 10 dB.
I will see if we have another part that might be expected to meet the requirement.
It's right for PM5E currently. So, please help to clarify if possible to improve ACP about 10dB by matching optimizing or other recommend one to meet the spec ? Thanks.
Sorry for the delay, our EZ alerts are not working correctly.
The HMC8500 designer believes that 10 dB of ACP improvement would not be possible by match optimization (regardless of whether you're using the PM5E or the LP5DE).
At your frequencies the HMC8500 currently has the highest OIP3 of any part from our product line so, we unfortunately do not have another ADI part to recommend that will meet your ACP specification.