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

Volume

59

Issue

9

fYear

2011

Firstpage

2265

Lastpage

2274

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;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2011.2160962

Filename

5976990