Part Number: LMH5401
Hi Experts:
We use the LMH5401 amplifier to drive high-speed ADCs, and the schematic diagram is as follows.
The gain we configured is 4. Recently, we tested the s11 parameters of the circuit and met an issue with the input impedance. The test results of S11 are shown in the following figure.
The Smith chart shows that the real part of the impedance decreases, while the imaginary part exhibits capacitive behavior. So what can we do to improve the input impedance matching characteristic within the broadband range (0~2GHz)?
