Dear Sirs;
We want to drive the TRF370417 LO port with a single-end 50 ohm signal. Since TRF370417 LO port is balance port, should we use a balun to transfer the single end LO to differential signal?
and there are two kind of balun, transmission type and trasformer type, which is most suitable for our purpose?
And will the LO signal balance influence the lo leakage performance?
THX!
Donald
Dear Kang:
Thanks for your comments.
1. Lo range is from 50MHz to 500MHz, IF range is 10 to 40MHz.
2. You said: reduce LO leakage (uncorrected) performance. Should we correct LO leakage by adjusting I/Q signal's amplitude and phase? Or should we adjust LOP/LON's amplitude/phase?
3. For the baluns, we have two choices:
MACOM's ETC1-1-13, it's transmission type:
MINICIRCUITS' TC1-1T, it's transformer type:
Which one is best for our purpose?
4. Someone suggets use two ETC1-1-13 in series as:
Do you think that's good for our purpose?
Thanks!
Donald
Hi Donald
2. You said: reduce LO leakage (uncorrected) performance. Should we correct LO leakage by adjusting I/Q signal's amplitude and phase? Or should we adjust LOP/LON's amplitude/phase?
Most of the DAC interfacing the TRF370417 will have LO adjustment capabilities. See examples such as the DAC5688, DAC3283, and DAC3484, etc.
If there is no balun driving the LO, the port will be single ended and will not be able to suppress even order harmonics. Even order harmonics will also include DC components, which is source of additional uncorrected LO leakage
3. For the baluns, we have two choices:
MACOM's ETC1-1-13, it's transmission type:
MINICIRCUITS' TC1-1T, it's transformer type:
I think TC1-1T+ will have the best phase and amplitude balance performance than the ETC1-1. I would advise using it. Again, you will have to evaluate it and consult with balun manufacturer.
4. Someone suggets use two ETC1-1-13 in series as:
I am not quite sure about the reasoning behind this. I cannot comment further
