The standard 3.3V LVPECL termination is shown in Figure 2. This termination scheme is used in characterization. The draw back of using this termination scheme in real applications is that it requires an additional power supply VCCO-2V = 1.3V. In actual applications, the terminations shown in Figure 3 and Figure 4 are commonly used. These termination approaches eliminate the need of 1.3V power supply. In Figure 5, R1 and R2 located near the driver serve as current paths for the LVPECL outputs. The R3=100 Ohm located near the receiving serves as matched load termination for the transmission lines.