Good morning gents
I am trying to test the rejection and conversion loss of "HMC1056LP4BE" IQ mixer (
https://www.analog.com/media/en/technical-documentation/data-sheets/hmc1056.pdf).
I set the LO to be +10dBm @8.5GHz, , IF1: -10dBm @250MHz, IF2: -10dBm @250MHz - Here I am using 3 different ports of a multichannel signal generator.
On the output, I am getting something wired, as every time I turn the off the IF1 and IF2 I get different values! The three runs below as an example:
-20.07 dBm @8.250GHz, -17.79 dBm @8.750GHz, -27.85 dBm @8.5GHz
-18.89 dBm @8.250GHz, -18.77 dBm @8.750GHz, -27.85 dBm @8.5GHz
-16.45 dBm @8.250GHz, -27.81 dBm @8.750GHz, -29.10 dBm @8.5GHz
On the other hand when I use either IF1 or IF2 and turn the other off, I am getting something consistent like below
(IF2 is off)
-22.26 dBm @8.250GHz, -22.14 dBm @8.750GHz, -27.82 dBm @8.5GHz
-22.19 dBm @8.250GHz, -22.08 dBm @8.750GHz, -27.72 dBm @8.5GHz
-22.12 dBm @8.250GHz, -22.01 dBm @8.750GHz, -27.65 dBm @8.5GHz
(IF1 is off)
-21.79 dBm @8.250GHz, -21.88 dBm @8.750GHz, -27.65 dBm @8.5GHz
-21.81 dBm @8.250GHz, -21.89 dBm @8.750GHz, -27.63 dBm @8.5GHz
-21.83 dBm @8.250GHz, -21.91 dBm @8.750GHz, -27.64 dBm @8.5GHz
Is anybody have any idea why I am getting different value every time please? Is there anything wrong I am doing and not aware of!
Nothing seems right to me