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本文提出一种基于8位DAC的源串联终端（SST）发射器，采用金属栅电阻实现，在7nm CMOS工艺下达到112Gb/s PAM-4速率和1.4pJ/b的能效，并集成8抽头前馈均衡（FFE）。该设计解决了高速有线通信中对多调制格式支持和长信道均衡的需求，同时实现了高能效。
Thomas Morf1, Serdar A. Yonar1, Mridula Prathapan1, Eric J. Lukes2, Raymond A. Richetta2, Carrie Cox3 IBM Research, Rüschlikon, Switzerland IBM Systems and Technology, Rochester, MN 3 IBM Systems and Technology, Durham, NC 4 now with Samsung Semiconductor India Research, Bangalore 1 2 Digital-to-analog converter (DAC)-based transmitters are suited to support different modulation formats (e.g., NRZ, PAM-4, OFDM), long-channel equalization (incl. roaming taps) or even amplitude reduction for reflection mitigation at short channels. Compared to transmitters with a conventional FFE, a less complex and more uniform high-speed analog frontend can be designed in a DAC TX if the number of taps is large (e.g., >5) because the equalization is performed in the digital signal processing (DSP) unit running at sub-rate. However, this imposes the challenge of achieving low latency and power consumption, particularly at high resolution (e.g. 8b) and speed. The DAC TX presented
Marcel A. Kossel1, Vishal Khatri1,4, Matthias Braendli1, Pier Andrea Francese1,