CMOS Closed-Loop Control of MEMS Varactors for Robust Ka -Band Tunable Filters
In: Journal of Microelectromechanical Systems, Jg. 28 (2019-10-01), S. 910-918
Online
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Zugriff:
A closed-loop capacitance sensing and control mixed-signal CMOS circuit with a dedicated sensor electrode and a proportional-integral controller was designed to have a sensitivity of 1 fF, a settling time of $200~\mu \text{s}$ , and a voltage capacity of 150 V. In a hybrid integration with a MEMS varactor, the control circuit could switch the varactor capacitance from 270 to 365 fF in 15 ms and hold it within ±2% between 25 °C and 80 °C. Furthermore, using the varactor as the tuning element of a substrate-integrated-waveguide (SIW) resonator, the control circuit could tune its resonance frequency from 33.2 to 33.9 GHz while keeping it within ±0.08% over a temperature range of 25 °C–90 °C. The control circuit occupied an area of 1.7 mm2 and consumed 6 mW. The present closed-loop-controlled MEMS-tunable resonators could be used in a quartz SIW multi-pole filter to realize tunable, small, light, low-cost, robust, and reliable millimeter-wave filters that are critical to 5G and other future-generation communication and radar systems.
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CMOS Closed-Loop Control of MEMS Varactors for Robust Ka -Band Tunable Filters
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Autor/in / Beteiligte Person: | Scarbrough, Derek ; Jin, Renfeng ; Hwang, James C. M. ; Goldsmith, Charles L. ; Mohammad Javad Asadi ; Ding, Guanghai |
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Zeitschrift: | Journal of Microelectromechanical Systems, Jg. 28 (2019-10-01), S. 910-918 |
Veröffentlichung: | Institute of Electrical and Electronics Engineers (IEEE), 2019 |
Medientyp: | unknown |
ISSN: | 1941-0158 (print) ; 1057-7157 (print) |
DOI: | 10.1109/jmems.2019.2929469 |
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