Czasopismo | PRZEGLĄD ELEKTROTECHNICZNY | Rocznik 2017 - zeszyt 3

Current-mode Multi-input Single-output Filter based on CCCDTAs

10.15199/48.2017.03.47

nr katalogowy: 104333
10.15199/48.2017.03.47

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. Streszczenie. 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. Wielowejściowy filtr bazujący na układzie CCCDTA Keywords: Current-mode, multi-input single-output, CCCDTA, grounded capacitor. Słowa kluczowe: filtr, układ CCCDTA, Introduction Analog filters are useful in analog signal processing. For example, they are used at the front-end of ADCs or smoothing on the output of DACs in audio systems, Tx/Rx in radio systems, and instrument and measurement systems [1-3]. Also, current-mode circuits have apparently been more popular in the synthesis and development of filters than voltage-mode circuits, since they have the advantages of simple circuitry, greater linearity, wider dynamic ranges, a high slew rate, high speed, etc. [4-10] as well as current-mode circuits which consume low voltage and low current thus yielding low power consumption. Recently, the main research topic for analog filters has required five response standard filters containing a highpass filter (HPF), a bandpass filter (BPF), a lowpass filter (LPF), a bandreject filter (BRF) or a notch filter and an allpass filter (APF) in the same configuration or circuit topology. Particularly, the multi-input single-output (MISO) filters have been of interest in [...]

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