A duobinary transmitter has been realized in this paper. The combination of high-frequency compensation characteristics of 6-tap feed forward equalizer (FFE) and high frequency attenuation characteristics of FR4 backplane is used to produce duobinary signal. 5-stage calibrated delay unit with source capacitance degeneration is used to achieve a delay of 100 ps. The load resistance, source resistance and source capacitor are used to improve the flatness of group delay of delay unit.
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