Scott McLeod
Fujitsu
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Scott McLeod.
international solid-state circuits conference | 2013
Samir Parikh; Tony Shuo-chun Kao; Yasuo Hidaka; Jian Jiang; Asako Toda; Scott McLeod; William W. Walker; Yoichi Koyanagi; Toshiyuki Shibuya; Jun Yamada
Standards such as OIF CEI-25G, CEI-28G and 32G-FC require transceivers operating at high data rates over imperfect channels. Equalizers are used to cancel the inter-symbol interference (ISI) caused by frequency-dependent channel losses such as skin effect and dielectric loss. The primary objective of an equalizer is to compensate for high-frequency loss, which often exceeds 30dB at fs/2. However, due to the skin effect in a PCB stripline, which starts at 10MHz or lower, we also need to compensate for a small amount of loss at low frequency (e.g., 500MHz). Figure 2.1.1 shows simulated responses of a backplane channel (42.6dB loss at fs/2 for 32Gb/s) with conventional high-frequency equalizers only (4-tap feed-forward equalizer (FFE), 1st-order continuous-time linear equalizer (CTLE) with a dominant pole at fs/4, and 1-tap DFE) and with additional low-frequency equalization. Conventional equalizers cannot compensate for the small amount of low-frequency loss because the slope of the low-frequency loss is too gentle (<;3dB/dec). The FFE and CTLE do not have a pole in the low frequency region and hence have only a steep slope of 20dB/dec above their zero. The DFE cancels only short-term ISI. Effects of such low-frequency loss have often been overlooked or neglected, because 1) the loss is small (2 to 3dB), 2) when plotted using the linear frequency axis which is commonly used to show frequency dependence of skin effect and dielectric loss, the low-frequency loss is degenerated at DC and hardly visible (Fig. 2.1.1a), and 3) the long ISI tail of the channel pulse response seems well cancelled at first glance by conventional equalizers only (Fig. 2.1.1b). However, the uncompensated low-frequency loss causes non-negligible long-term residual ISI, because the integral of the residual ISI magnitude keeps going up for several hundred UI. As shown by the eye diagrams in the inset of Fig. 2.1.1(b), the residual long-term ISI results in 0.42UI data-dependent Jitter (DDJ) that is difficult to reduce further by enhancing FFE/CTLE/DFE, but can be reduced to 0.21UI by adding a low-frequency equalizer (LFEQ). Savoj et al. also recently reported long-tail cancellation [2].
compound semiconductor integrated circuit symposium | 2010
Nikola Nedovic; Anders Kristensson; Samir Parikh; Subodh M. Reddy; Scott McLeod; Nestoras Tzartzanis; Kouichi Kanda; Takuji Yamamoto; Satoshi Matsubara; Masaya Kibune; Yoshiyasu Doi; Satoshi Ide; Yukito Tsunoda; Tetsuji Yamabana; Takayuki Shibasaki; Yasumoto Tomita; Takayuki Hamada; Mariko Sugawara; Tadashi Ikeuchi; Naoki Kuwata; Hirotaka Tamura; Junji Ogawa; William W. Walker
A Dual-mode 2 ×21.5-22.3 Gb/s DQPSK or 1 × 39.8-44.6 Gb/s NRZ to 4 × 9.95-11.2 Gb/s SFI5.2-compliant two-chip SerDes for a family of 40 Gb/s optical transponders has been fabricated in 65 nm 12-metal CMOS. By demultiplexing to 16 × 2.5 Gb/s internally, all logic and testability functions could be implemented in standard-cell CMOS, resulting in total power consumption of 3 W, 75 % lower than commercial BiCMOS SFI5 40 Gb/s SerDes ICs. Chip area is 4 × 4 mm, and the ICs are flip-chip mounted into a quad flat-pack package.
Archive | 2010
Scott McLeod; Nikola Nedovic
symposium on vlsi circuits | 2009
Nikola Nedovic; Samir Parikh; Anders Kristensson; Nestoras Tzartzanis; William W. Walker; Subodh M. Reddy; Hirotaka Tamura; Scott McLeod; Takuji Yamamoto; Yoshiyasu Doi; Junji Ogawa; Masaya Kibune; Takayuki Shibasaki; Takayuki Hamada; Yasumoto Tomita; Tadashi Ikeuchi; Naoki Kuwata
Archive | 2012
Scott McLeod; Nikola Nedovic
Archive | 2012
Shuo-Chun Kao; Scott McLeod
Archive | 2011
Scott McLeod
international solid-state circuits conference | 2018
Marc Erett; Declan Carey; James Hudner; Ronan Casey; Kevin Geary; Pedro Neto; Mayank Raj; Scott McLeod; Hongtao Zhang; Arianne Roldan; Hongyuan Zhao; Ping-Chuan Chiang; Haibing Zhao; Kee Hian Tan; Yohan Frans; Ken Chang
Archive | 2012
Scott McLeod; Nikola Nedovic
Archive | 2011
Scott McLeod; Nikola Nedovic