2.3.3.2 SerDes I/O Power (SERDES_x_VDDAIO)

The target impedance of the SERDES_x_VDDAIO pin is calculated as 240 mΩ, based on the following values (see Power Supply):

  • VSUPPLY = 1.2 V
  • Itrans= 250 mA

  • Ripple = 5%

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

Figure 2-11. Impedance Profile of SERDES_x_VDDAIO Plane Over Frequency Range