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MEMS FILTER WITH VOLTAGE TUNABLE CENTER FREQUENCY AND BANDWIDTH
 

Summary: MEMS FILTER WITH VOLTAGE TUNABLE CENTER FREQUENCY
AND BANDWIDTH
Lih Feng Cheow, Hengky Chandrahalim, and Sunil A. Bhave
OxideMEMS Lab, 102 Phillips Hall, Cornell University, Ithaca, NY 14853, USA
ABSTRACT
This paper reports on the design of a reconfigurable ladder filter
using RF MEMS resonators with voltage-tunable series and
parallel resonance frequencies. The ladder filter consists of one
shunt and two series resonators operating in the half-wave
thickness shear vibration mode. It demonstrates a center frequency
tuning range of 8 MHz at 817 MHz and an adjustable bandwidth
from 600 kHz to 2.8 MHz, while maintaining an insertion loss < 4
dB, stop-band rejection > 30 dB and pass-band ripple < 2 dB. This
voltage tunable design enables channel agility and
reconfigurability, substantially reducing the filter count in channel-
select radio receiver architectures. Finally, a simple algorithm is
provided to facilitate dynamic tuning of filter center frequency and
bandwidth.
INTRODUCTION
Multi-band, multi-standard radio receivers require a large array of

  

Source: Afshari, Ehsan - School of Electrical and Computer Engineering, Cornell University

 

Collections: Engineering