Tokyo Tech News
Published: June 21, 2016
Realizing Compact, Low-Cost, High-Speed Radio Communication Systems for the IoT Age
In collaboration with the National Institute of Information and Communications Technology (NICT), Associate Professor Hiroyuki Ito and Professor Kazuya Masu, et.al., of the Tokyo Institute of Technology, developed a new algorithm and circuit technology allowing high-frequency piezoelectric resonators to be used for phase locked loops (PLL). It was confirmed that these operate with low noise and have an excellent Figure of Merit (FoM) compared to conventional PLLs.
This technology allows high-frequency piezoelectric resonators to be used in place of crystal oscillators which was a problem for realizing compact and low-cost radio modules. This greatly contributes to the creation of compact, low-cost, high-speed radio communication systems for the IoT age. High-frequency piezoelectric resonators are compact, can be integrated, have an excellent Q value, and oscillators that use these have excellent jitter performance. High-frequency piezoelectric resonators had greater issues with resonance frequency variance and temperature dependability compared to crystal resonators. However, these issues were resolved by the development of a PLL that uses a channel adjustment technique, which is a new algorithm.
A prototype was fabricated by a silicon CMOS process with a minimum line width of 65 nm, and a maximum frequency output of approximately 9 GHz was achieved with a phase fluctuation of only 180 femtoseconds. Power consumption was 12.7 mW. This performance is equivalent to a PLL Figure of Merit (FoM) of -244 dB, and it has the world's top-class performance as a fractional-N PLL. This can contribute to the realization of compact, low-cost, high-speed radio communication systems.
The study results will be announced in local time June 17 in the "2016 Symposium on VLSI Circuits," to be held in Hawaii from June 14 .
Explanations of Technical Terms
Sho Ikeda1, Hiroyuki Ito1, Akifumi Kasamatsu2, Yosuke Ishikawa1, Takayoshi Obara1, Naoki Noguchi1, Koji Kamisuki1, Yao Jiyang1, Shinsuke Hara2, Dong Ruibing2, Shiro Dosho1, Noboru Ishihara1, Kazuya Masu1
An 8.865-GHz -244dB-FOM High-Frequency Piezoelectric Resonator-Based Cascaded Fractional-N PLL with Sub-ppb-Order Channel Adjusting Technique
Session 22 — Clock and Frequency Synthesis, The 2016 Symposium on VLSI Circuits
1Institute of Innovative Research, Tokyo Institute of Technology
2Natinal Institute of Information and Communications Technology
Associate Professor Hiroyuki Ito
Institute of Innovative Research, Tokyo Institute of Technology
Center for Public Affairs and Communications, Tokyo Institute of Technology
Press Office, Public Relations Department
National Institute of Information and Communications Technology