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A single-ended transmitter (Tx) is proposed to compensate for the crosstalk-induced jitter (CIJ) of coupled microstrip lines by subtracting a mimicked crosstalk waveform from data signal at Tx during the data transition time, depending on the data transition of an adjacent line. Since the CIJ component is proportional to the time derivative of data signal, the mimicked crosstalk waveform subtracted at Tx cancels the CIJ at receiver (Rx) for the linearly changing data signal with time. As a by-product, this scheme reduces ISI at Rx. The Tx chip in a 0.13-m CMOS process reduces the total Rx jitter by 96 ps (69%) at 7.2 Gbps (4-in channels) and by 120 ps (72%) at 6 Gbps (8-in channels).

A serpentine guard trace located between two microstrip transmission lines reduced the peak far-end crosstalk voltage and the difference in propagation delay times between the even and odd mode signals by more than half of those of the no guard case, respectively, without the PCB area overhead. This reduction was achieved by increasing mutual capacitance without changing mutual inductance. IntroductionIn the parallel microstrip lines on printed circuit board (PCB), the electromagnetic coupling generates the far-end crosstalk and the difference in propagation delay times between the even and odd mode signals. By this effect, the eye opening is reduced at the high-speed signaling and the maximum data rate through the microstrip lines is limited.