Other Parts Discussed in Thread: TRF3722, , TRF3705
Hi
I am giving a constant sweep data at dac input. I have a reconstruction filter at the output. I probed the DAC output at 50ohm termination resistor and found that the flatness is 4dB.
I want to know, whether I can probe DAC output as it is a CMOS current output?
Whether the bad flatness can be due to the reconstruction filter in case it is not 50ohm matched properly. Or may be some programming mistake?
My problem is since i hve not given proper connector at the exact dac output, i am left with the option of probing it to find out the output so that i can even tune the filter if needed.
Is there any other option?
Can you suggest me a a reconstruction filter for 160-195MHz band? The filter I have in my layout is:
In this i have got 4dB flatness by changing 391nH to 250nH.