The wiring of the high-frequency simulation circuit is often a fear, there are too many things in this, there is no certain experience, it is difficult to understand what the factors will determine the role. In the experiment of the AD6644, I saw the evaluation board on the Datasheet of Adi, in fact, I have seen it before, but I don't care, after careful research, I found that many questions can be found. Answer.
The problem of the board surface layer.
The signal passes through the SMA connector into the circuit, and the signal is packaged in the surface layer.
In order to match the length of the data line, the AD6644 is placed tilted.
The input impedance matching resistance is placed in a position that is most close to the SMA input core.
Simulation of power and digital power supply segmentation.
The non-polar capacitor uses a short and wide package.
