This paper presents a circuit technique to enhance a timing margin between internal data and clock by enlarging an eye opening of the internal data in a unique current mode transceiver [1]. This technique compensates a systematic timing offset of the internal data, which is caused by unbalanced transmission current. The test-chip exhibits 0.1UI (Unit Interval) improvement of the internal data eye opening without significant power penalty, and achieves stable data communication through 50% longer transmission lines compared to the previous work [1].