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Part Number: TRF370417EVM
I'm trying to see the output of the TRF370417EVM evaluation module with only LO at the input as a first test.
The module is biased with 5 V and I and Q ports are biased with 1.7 V and terminated with 50 Ohm.
The LO frequency is 500 MHz..
What I see at the output is a lot of unwanted tones where tones at 2. 4 .6 GHz are dominating.
Any idea what I'm doing wrong?
You are likely seeing the harmonics generated by the modulator and your LO source generator. If all the BB input ports are biased to 1.7V and terminated then you should see your LO bleed-through at 500 MHz at about -40 dBm. You will also see 2nd and 3rd and higher harmonics at similar levels...maybe a bit higher in some cases. A high 13th harmonic at 6 GHz is unusual which leads me to think that the LO source is generating this. Look at the harmonic content from your source to see if this is the case or filter the LO before injecting into the modulator.
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In reply to RJ Hopper:
In reply to Dragan Gecan:
Thank you very much for the support and confirming the results.
I have another question.
The evaluation board is supplied with 5 V and the base band ports are supplied with 1.7 V using 1 uF capacitor as a DC block. Single tone signal is delivered to the I+ port and all the other ports are terminated with 50 Ohm. The LO is connected to the LOP port and LON is terminated with 50 Ohm.
The single tone signal is swept from 1 MHz to 500 MHz and the frequency response at the RF output is shown in the figure below. Amplitude of the base band signal is around 100 mV rms.
Is the frequency response (the roll off at lower frequencies) for this scenario something I should expect? According to the datasheet it should work for kilohertz as well.
So basically this part can only be used as AC coupled?
We want to use this part with AC coupled DAC module. Is there a way of doing that?
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