Hi, Thanks for your reply. I have used the TC4-1W transformer of the DAC3283 output interface, and it is ac coupled. Now I want the output voltage to be dc level, and i use a 25Ω resistor connect to 3.3V, then the current sink through the resistor, and the output ac voltage is 2.8V centered, 0.5Vpp, I think. But when I catch the signal from the oscilloscope , the output ampitude is still attenuation when the frequency from 1MHz to 20MHz. I don't what the problem is. Thanks.
↧