SerDes Core Power (SERDES_x_VDD)

The target impedance of the SERDES_x_VDD pin is calculated as 300 mΩ, based on the following values (see Power Supply):

• V_SUPPLY = 1.2 V
• I_trans = 200 mA

• Ripple = 5%

The following figure shows the impedance of the plane (SERDES_x_VDD) improved by the decoupling capacitors. The impedance of the plane is kept under 0.2 Ω till 100 MHz.

Figure 1. Impedance Profile of SERDES_x_VDD Plane Over Frequency Range