I have an evaluation board EV1HMC252AQS24 on hand. It is a new board. I tested it by connecting the RFC port to a waveform generator and RF1-6 port to an oscilloscope. The input signal was a square wave with a frequency of 1MHz and a Vpp of 4V.
- At the beginning, there is a serial capacitor at the input and output port. The output wave has many peaks (see Image_1). Obviously, it is the output of a high-pass filter.
- Then I removed these capacitors. The output wave is a square wave (see Image_2). It is correct except for a little insertion loss.
- But when I measured the output signal from those ports that was not selected, I also got some square wave (see Image_3). It is not correct. There should be no waves on those ports.
Is the chip broken? Please help me to solve this problem. Thank you.