Datasheet

Input and Output Return Loss
Figure 13 shows the LMH0387 input and output return loss measured at the BNC_IO on the SD387. The return
loss is measured on the Rohde & Schwarz ZVR 75Ω 4GHz network analyzer, with a 75Ω BNC to 75Ω Type N
connector on the input. For the input return loss, the equalizer is active and the cable driver is disabled
(TX_EN = 0). For the output return loss, the equalizer is forced to sleep and the cable driver is enabled, with an
8 MHz clock input signal applied to the cable driver inputs.
FIGURE 13. LMH0387 Input and Output Return Loss
SD387EVK User Guide 17 of 23
Rev 1.1 © 2010 National Semiconductor Corp.