Title :
A Novel Frequency Control Loop for Tunable Notch Filters
Author :
De Luis, Javier R. ; Gu, Qizheng ; Morris, Arthur S. ; De Flaviis, Franco
Author_Institution :
Wispry Inc., Irvine, CA, USA
Abstract :
In this paper, a novel frequency control loop system for tunable notch filters is presented. The frequency control loop is designed for automatically tuning a microelectromechancial systems tunable notch filter, which has 22-dB rejection in the notch band and less than 0.8-dB insertion loss over a 5-MHz passband bandwidth in the International Mobile Telecommunications band (2.1 GHz). The filter frequency control loop is based on sensing the reflection phase change of a reference signal (in this case, the transmitter carrier) and is developed to track the transmitter operation frequency.
Keywords :
micromechanical devices; notch filters; International Mobile Telecommunications band; automatical tuning; bandwidth 5 MHz; frequency 2.1 GHz; frequency control loop; insertion loss; microelectromechancial systems; reflection phase change; transmitter operation frequency; tunable notch filters; Automatic frequency control; Capacitors; Mathematical model; Mobile communication; Transmitters; Tuning; Actuation delay; RF microelectromechanical systems (MEMS); filter frequency control loop; loop convergence; notch filter; tunable capacitors; tunable filter;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2011.2160962
