A transmitter with different output timing to compensate for the crosstalk-induced jitter of coupled microstrip lines

Abstract

By using the data timing control at transmitter (TX), the crosstalk-induced jitter (CIJ) is compensated for in the 2-bit parallel data transmission through the coupled microstrip lines on printed circuit board (PCB). The difference in propagation velocity with the signal modes (odd, static, even) is compensated for by sending data earlier or later at TX according to the signal modes, so that the signals of different modes arrive at receiver (RX) at the same time. This transmitter is implemented by using the delay block with low jitter and a 3:1Mux to select one CLKT of the generated three different sampling CLKD, in advance. The TX is implemented by using a 0.18 μm CMOS process. The measurement shows that the TX reduces the RX jitters by about 38 ps at the data rates from 2.6 Gbps to 3.8 Gbps.