Quality factor enhancement for resonant MEMS applying an analogue feedback circuit driven by a lock-in amplifier

2013 ◽  
Author(s):  
Martin Kucera ◽  
Franz Hofbauer ◽  
Tomás Manzaneque ◽  
Victor Ruiz ◽  
José Luis Sánchez-Rojas ◽  
...  
Keyword(s):  
Quality Factor ◽  
Feedback Circuit ◽  
Lock In

A New Method for Increasing Quality Factor in Active Filters

2017 ◽  
Vol 26 (09) ◽  
pp. 1750140 ◽  
Author(s):  
Abdullah Yesil ◽  
Firat Kacar
Keyword(s):  
Quality Factor ◽  
Intermediate Frequency ◽  
Current Conveyor ◽  
Active Filters ◽  
New Method ◽  
Center Frequency ◽  
Feedback Circuit ◽  
Filter Structure ◽  
Transconductance Amplifier ◽  
Differential Voltage Current Conveyor

In this paper, we present a new method increasing quality factor of active filter structure in the literature and a new designed filter. The new method is easily applied to all different filter modes with the proper feedback circuit. The center frequency of the filter remains constant as quality factor of filter increases. Also, quality factor can be also tuned electronically by changing the biasing current of the feedback circuit. Furthermore, the performance of the method is demonstrated by CMOS simulation of differential voltage current conveyor and transconductance amplifier. Quality factor value of the filter can also be easily adjusted electronically between 1 and 20 with the presented method. Finally, an application example of the presented method is presented for double tuned amplifier for intermediate frequency pre-amplifier of FM receiver.

Amplitude-Modulated Lock-In Vibrothermography for NDE of Polymers and Composites

1995 ◽  
Vol 7 (1) ◽  
pp. 215-228 ◽  
Author(s):  
J. Rantala ◽  
D. Wu ◽  
G. Busse
Keyword(s):  
Lock In

A Raman signature of the incommensurate-commensurate phase transition (lock-in) in a crystalline monomer diacetylene : pTS

1982 ◽  
Vol 43 (5) ◽  
pp. 755-759 ◽  
Author(s):  
M. Bertault ◽  
M. Krauzman ◽  
M. Le Postollec ◽  
R.M. Pick ◽  
M. Schott
Keyword(s):  
Phase Transition ◽  
Commensurate Phase ◽  
Lock In

NÉEL LINES STRUCTURES IN UNIAXIAL FERROMAGNETS WITH QUALITY FACTOR Q > 1

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1947-C8-1948
Author(s):  
J. Miltat ◽  
P. Trouilloud
Keyword(s):  
Quality Factor ◽  
Quality Factor Q

Examination of Measurement Method for Magnetostriction of Electrical Steel Sheet with Lock-in Amplifier

2012 ◽  
Vol 132 (11) ◽  
pp. 1033-1038
Author(s):  
Yuichiro Kai ◽  
Yuji Tsuchida ◽  
Takashi Todaka ◽  
Masato Enokizono
Keyword(s):  
Measurement Method ◽  
Steel Sheet ◽  
Electrical Steel ◽  
Lock In ◽  
Electrical Steel Sheet
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