A 1-pJ/bit 80-Gb/s $2^{15}-1$ PRBS Generator With a Modified Cherry–Hooper Output Driver
A 1-pJ/bit 80-Gb/s $2^{15}-1$ PRBS Generator With a Modified Cherry–Hooper Output Driver
复制标题
具有改进的 Cherry–Hooper 输出驱动器的 1pJ/bit 80-Gb/s $2^{15}-1$ PRBS 发生器
DOI：
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发表时间：
2019
影响因子：
5.4
通讯作者：
F. Ellinger
中科院分区：
文献类型：
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作者：
M. Khafaji;R. Henker;F. Ellinger
介绍了一种适用于二进制通信系统测试的80 Gb/s 2 ^{15}-1 $伪随机二进制序列发生器。该电路采用130 nm SiGe工艺实现，针对低功耗进行了优化。对于核心功能，实现了1 pJ/bit的能量效率，这是可比的已发布设计中的最佳值之一。另外，对输出信号的时域和频域的改善也进行了针对性的研究。影响一个理想的PRBS频谱的关键因素，确定和解决从系统和电路的角度来看。这导致杂散抑制高于40 dB，这是15 dB优于以前报道的作品超过40 Gb/s。作为输出驱动器，一个修改的Cherry-Hooper放大器被选择。介绍了一种获得贝塞尔响应的参数化设计方法，并对放大器进行了低功耗优化。测量结果表明，单端输出信号具有超过300 mV的眼图开度，0.6 ps的均方根抖动，以及在80 Gb/s时优于10.5的信噪比，据我们所知，这是PRBS发生器的同类最佳输出眼图。
An 80-Gb/s $2^{15}-1$ pseudorandom binary sequence (PRBS) generator suitable for testing binary communication systems is presented. Implemented in a 130-nm SiGe process, the circuit is optimized for low power dissipation. For the core functionality, an energy efficiency of 1 pJ/bit is achieved, which is one of the best values among comparable published designs. In addition, the improvement of the output signal in time domain and frequency domain is targeted. The key factors affecting an ideal PRBS spectrum are identified and addressed from the system and circuit point of view. This results in spur suppression of higher than 40 dB, which is 15 dB better than previously reported works exceeding 40 Gb/s. As an output driver, a modified Cherry–Hooper amplifier is chosen. A parametrized design methodology for obtaining Bessel response is introduced and the amplifier is optimized for low power operation. Measurement results show a single-ended output signal with over 300-mV eye opening, 0.6-ps rms jitter, and a signal-to-noise ratio better than 10.5 at 80 Gb/s, which is the best-in-class output eye diagram for a PRBS generator, to the best of our knowledge.