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Small Gain lower than expected

Category: Hardware
Product Number: HMC8205BF10, HMC8205

Hello team,

we are testing HMC8205BF10:

- we bought 2 devboard and had S param identical to the one in data sheet.

- we bought 2 HMC8205BF10 from Mouser and replace the amplifier given with the dev board by the one from mouser and  S21 is 2/3 db below the standard. (Of course same test bench and same standard biasing)

We don't understand why these differences.

Thank you for your feedback.