Reference Case Number: CS0219386
We designed a PCB to host the SN75LVCP601 SATA redriver chip and it works great, but I have some questions. First question is, what advice is there on using two of the redrivers on a single path, such as one redriver PCB placed at the host and the other redriver PCB placed at the device? The length between our host and device is approximately 4.5 ft. I have found switch setting for both sides that work and that is good, but we also have a scenario in which one of the redrivers might not be present and in that scenario the switch setting that worked with two does not work with one. Any advice/recommendations are appreciated.
Second question is, when I connect the redriver PCB to a four port network analyzer to measure the insertion loss, the transmit path shows an insertion loss across the entire frequency range (my max was set at 6 GHz), but the receive path insertion loss drops off to approx. -50 dB around 3.6 GHz. The drop off point can be extended if I increase the network analyzer stimulus power, but why would it do that?
Here are the test setups:
Port 1, Port 2 -> Into the host side of the redriver.
Port 3, Port 4 -> Out of the device side of the redriver.
Port 1, Port 2 -> Into the device side of the redriver.
Port 3, Port 4 -> Out of the host side of the redriver.