A 94GHz Locking Hysteresis-Assisted and Tunable CML Static Divider in 65nm SOI CMOS
Daeik D. Kim, Jonghae Kim, and Choongyeun Cho
IEEE International Solid-State Circuits Conference (ISSCC) 2008, Feb. 2008 Page(s):460 - 628
DOI: 10.1109/ISSCC.2008.4523256
Abstract
As an essential clock-system component, millimeter-wave dividers have been implemented for V- and W-band channels. This has also served as a standard benchmark vehicle that reveals high-speed and low-power performances of a technology. Through technology scaling, CMOS CML static divider high-frequency performances have been scaled, and they are comparable to dividers in other technologies. In addition to the device performance, circuit design and measurement determine the divider high-speed and wide frequency range performance. One of the uncertainties in CML static divider measurement is pulling and locking hysteresis. By using CML static divider topology, the divider has been assumed to have a fixed wide operation range, from DC to the fdiv , max, the maximum input-referred divider operational frequency. In fact, the CML static dividers show a certain degree of locking hysteresis, similar to injection-locking dividers. When the circuit sensitivity curve is measured, it is not clear where to set the threshold. Depending on the method, a sensitivity curve can be optimistic or pessimistic. A similar problem lies in the fdiv , max, since it changes depending on the status of a divider. Also, there have not been any analytic results that can interpret the circuit parameters and performance, in spite of the common use of sensitivity curve in literatures.Download
PDF file<<Go back to the previous page
The papers in this page are provided as courtesy and are presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. Other restrictions to copying individual documents may apply.