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ROONGMUANPHA, N. FASEEHUDDIN, M. HERENCSÁR, N. TANGSRIRAT, W.
Original Title
Tunable Mixed-Mode Voltage Differencing Buffered Amplifier-Based Universal Filter with Independently High-Q Factor Controllability
Type
journal article in Web of Science
Language
English
Original Abstract
This paper proposes the design of a mixed-mode universal biquad configuration, which realizes generic filter functions in all four possible modes, namely voltage mode (VM), current mode (CM), transadmittance mode (TAM), and transimpedance mode (TIM). The filter architecture employs two voltage differencing buffered amplifiers (VDBAs), two resistors and two capacitors, and can provide lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS), and allpass (AP) biquadratic filtering responses without any circuit alteration. All passive elements used are grounded, except VM. The circuit not only allows for the electronic tuning of the natural angular frequency (ωo), but also achieves orthogonal tunability of the quality factor (Q). It also provides the feature of availability of output voltage at the low-output impedance terminal in VM and TIM, and does not require inverting-type or double-type input signals to realize all the responses. Moreover, in all modes of operation, the high-Q filter can be easily obtained by adjusting a single resistance value. Influences of the VDBA nonidealities and parasitic elements are also discussed in detail. PSPICE simulations with TSMC 0.18-µm CMOS process parameters and experimental testing results with commercially available IC LT1228s have been used to validate the theoretical predictions.
Keywords
active filter; mixed mode; universal biquadratic filter; voltage differencing buffered amplifier (VDBA)
Authors
ROONGMUANPHA, N.; FASEEHUDDIN, M.; HERENCSÁR, N.; TANGSRIRAT, W.
Released
15. 10. 2021
Publisher
MDPI
ISBN
2076-3417
Periodical
Applied Sciences - Basel
Year of study
11
Number
20
State
Swiss Confederation
Pages from
1
Pages to
27
Pages count
URL
https://www.mdpi.com/2076-3417/11/20/9606
Full text in the Digital Library
http://hdl.handle.net/11012/201786
BibTex
@article{BUT172793, author="Natchanai {Roongmuanpha} and Mohammad {Faseehuddin} and Norbert {Herencsár} and Worapong {Tangsrirat}", title="Tunable Mixed-Mode Voltage Differencing Buffered Amplifier-Based Universal Filter with Independently High-Q Factor Controllability", journal="Applied Sciences - Basel", year="2021", volume="11", number="20", pages="1--27", doi="10.3390/app11209606", issn="2076-3417", url="https://www.mdpi.com/2076-3417/11/20/9606" }
Documents
applsci-11-09606.pdf