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2 2017

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Electronically tunable SIMO Mixed-mode universal filter using VDTAs

Chamnanphrai V., Sa-ngiamvibool W.

Przegląd Elektrotechniczny

2017

R. 93, nr 3

207--211

This research paper presents a single-input multi-output (SIMO) mixed-mode universal filter based on voltage differencing transconductance amplifier (VDTA). The proposed filter can be used in both voltage and trans-admittance modes. In the voltage mode, it can serve as highpass filter (HPF), bandpass filter (BPF) and lowpass filter (LPF). In the trans-admittance mode, the proposed filter can provide HPF, BPF and LPF. Furthermore, by interconnection of significant output currents, the proposed filter can be able to work as bandreject filter (BRF) and allpass filter (APF). The proposed filter consists of 3 VDTAs and 2 grounded capacitors. This configuration allows the proposed filter to be suitable for fabricating into IC. Without effect of pole frequency, the quality factor can be electronically tuned the by adjusting DC bias current of the VDTA. The PSPICE simulation was utilized to confirm the performance of the proposed filter. The results of the simulation agree well in accordance with theoretical analysis.

W artykule zaprezentowano uniwersalny filtr bazujący na voltage differencing tranconductance amplifier VDTA. Filtr może pracować we wszystkich trybach, jak dolnoprzepustowy, górnoprzepustowy, środkowo przepustowy i środkowo-zaporowy. Filtr składa się z 3 układów VDTA I dwóch uziemionycvh pojemności.

Current-mode multi-input single-output filter based on CCCDTAs

Kinnaree P., Sa-Ngiamvibool W.

Przegląd Elektrotechniczny

2017

R. 93, nr 3

201--206

This paper presents three current-mode multi-input single-output filters based on the current controlled current differencing transconductance amplifier (CCCDTA). They can be set to serve as standard filter functions. The pole frequency and quality factor parameters are such that filters can be electronically controlled and independently tuned via input bias current of the CCCDTAs. All output filters have highimpedances in current-mode configuration. Their performances were simulated by using PSPICE which resulted in a correlation with the theoretical prediction.

W artykule zaprezentowano trzy filtry bazujące na current controlled current differencing transconductance amplifier CCCDTA. Filtry mogą być strojone za pośrednictwem wejścuowego prądu bias układu CCCDTA.