High-Speed SiGe BiCMOS Circuits for Optical Communication
2023 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS)(2023)
摘要
This paper presents an overview of SiGe BiCMOS circuits for next-generation optical communication links targeting 100 GBd PAM4 modulation per wavelength to support 4-lane 800Gb and 8-lane 1.6Tb Ethernet. Signal generation at these rates is challenging. For this, an analog multiplexer making use of return-to-zero (RZ) modulation is presented. The explicit RZ generation enables equalization of the interleaved signal. Higher equalization orders are obtained with a 120 GBd PAM4 4-to-1 multiplexer with a mixed-signal 7-tap feedforward equalizer. The equalizer consists of a combination of digital delay cells and analog delay cells enabling a compact and power efficient solution. Quad-channel modulator drivers and receivers finish the required highspeed circuits. Based on traveling-wave architectures high gain-bandwidth products are realized.
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关键词
optical transceivers,driver,equalizer,transimpedance amplifier,multiplexer
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