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研究并设计了一款5 Gbit/s大摆幅电压模发送器,输出信号差分眼图高度可达1.2 V。工作在1.2 V电压下的输出驱动器由28个相同的子驱动器并联而成,且每个子驱动器都包含权重按照二进制关系递增的4个驱动单元,从而实现了去加重控制与阻抗校正相互独立。为了使输出驱动器的阻抗与传输线的特征阻抗匹配,提出了一种数模混合负反馈环路的阻抗自校正电路,对上拉和下拉部分电阻分别进行校正,实现了5%的校正精度和±40%的校正范围,且回波损耗(S11)在10 GHz时小于-15 d B。设计采用55 nm CMOS工艺流片,面积为320μm×255μm。数据率为5 Gbit/s时,功耗为51.81 m W,总的输出抖动为4.3 ps。
A 5 Gbit / s large-swing voltage-mode transmitter was researched and designed to output a differential signal eye with a height of 1.2 V. Output drivers operating at 1.2 V are paralleled by 28 identical subdrivers, each of which contains four drive units with increasing weights in binary relation, making de-emphasis control and impedance correction independent of each other. In order to match the impedance of the output driver with the characteristic impedance of the transmission line, an impedance self-correcting circuit of the mixed-mode mixed-negative feedback loop is proposed, and the resistance of the pull-up and pull-down parts are respectively corrected to achieve a correction accuracy of 5% 40% of the calibration range, and the return loss (S11) is less than -15 d B at 10 GHz. The design uses 55 nm CMOS process chip, an area of 320μm × 255μm. At a data rate of 5 Gbit / s, the power dissipation is 51.81 mW and the total output jitter is 4.3 ps.