Self-calibrating on-chip termination resistor for high-speed SerDes

A digital tuning self-calibrating on-chip termination resistor for high-speed SerDes is presented in this paper. An offchip reference resistor is used to adjust the on-chip resistor automatically through feedback. SAR logic is used for tuning, which shorts the tuning time. Special analog design is used to eliminate the offset of circuit and reduce the power consumption.