Limitation of Q-factor of second-order active filter using finite gain operational amplifiers

1975 ◽  
Author(s):  
Pui-leung Chiu
Keyword(s):  
Active Filter ◽  
Second Order ◽  
Operational Amplifiers ◽  
Q Factor ◽  
Finite Gain

A new second-order multifunctional RC-active filter circuit using two operational amplifiers

1980 ◽  
Vol 100 (1) ◽  
pp. 117-122
Author(s):  
Takahiro Inouye ◽  
Fumio Ueno ◽  
Hiroo Okamoto
Keyword(s):  
Active Filter ◽  
Second Order ◽  
Operational Amplifiers

scholarly journals Reduction of operational amplifiers finite gain effects in switched-capacitor biquads

2005 ◽  
Vol 2 (1) ◽  
pp. 29-41
Author(s):  
Nikolay Radev ◽  
Kantcho Ivanov
Keyword(s):  
Operational Amplifiers ◽  
Switched Capacitor ◽  
Q Factor ◽  
Combined Approach ◽  
Feed Forward ◽  
Band Pass ◽  
Finite Gain

A combined approach for reducing the errors in the pole frequency f p, the pole Q - factor Qp and the magnitude at the pole frequency Hp, of switched capacitor biquads is presented. First, the conventional integrators in the biquads are replaced with gain-and offset-compensated integrators. Next, the errors ? ?p / ?p, ? Qp / Qp and ? Hp / Hp are minimized by modifying three capacitances: two feedback capacitances and feed forward capacitance. The effectiveness of this approach is demonstrated by designing a band pass biquad.

Microwave Active Filter using Finite Gain Amplifier

2002 ◽  
Author(s):  
H. Diab ◽  
F. Temcamani ◽  
J.L. Gautier
Keyword(s):  
Active Filter ◽  
Finite Gain

Bandwidth-enhanced lumped-element absorptive bandstop filter topology and its application to LTCC bandstop filter design

2014 ◽  
Vol 7 (6) ◽  
pp. 691-698 ◽  
Author(s):  
Juseop Lee ◽  
Byungguk Kim ◽  
Kangho Lee ◽  
William J. Chappell
Keyword(s):  
Low Temperature ◽  
Filter Design ◽  
Second Order ◽  
Center Frequency ◽  
Q Factor ◽  
First Order ◽  
Lumped Element ◽  
Bandstop Filter ◽  
Analytic Design ◽  
Order Four

In this paper, we show a second-order (four-resonator) absorptive bandstop filter circuit topology which gives a larger bandwidth compared to a first-order topology. Due to the absorptive characteristic, it creates a large attenuation at the center frequency using low-Q resonators. Since low-Q resonators can be used in generating a large attenuation, small-size resonators can be employed in bandstop filter design. Analytic design equations are provided so that a higher-order absorptive bandstop filter can be designed analytically. It is also shown that the second-order filter topology exhibits a better frequency selectivity having a same bandwidth. The proposed filter topology has been applied to a design of a miniaturized low-temperature co-fired ceramic bandstop filter with low-Q resonators. The Q-factor of the lumped-element resonators has been chosen to be 5 for demonstration.

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