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A Novel Frequency Control Loop for Tunable Notch Filters

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4 Author(s)
De Luis, J.R. ; Wispry Inc., Irvine, CA, USA ; Qizheng Gu ; Morris, Arthur S. ; De Flaviis, F.

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.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:59 ,  Issue: 9 )