Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Adirek JANTAKUN"

The Configuration of Current-mode Single-input Multi-output, Multi-input Single-output Biquad Filter and Quadrature Oscillator based-on BiCMOS CCCTAs DOI:10.15199/48.2017.07.23

Czytaj za darmo! »

An analog signal processing, the universal and multifunction biquad filters are extremely for pay attention to research and publish [1-5] since they are essentially used in communication system, instrument, measurement system and etc [1-5]. The single-input multi-output (SIMO) biquad filter is realized standard-function filter outputs which are highpass filter (HPF), lowpass filter (LPF) and bandpass filter (BPF), bandreject filter (BRF) or notch filter and allpass filter (APF) with feeding single input signal. Simultaneously, multi-input single-output (MISO) multifunction filter can be performed filter outputs including HPF, LPF, BPF, BRF and APF by selection/connection the input signals. At the same time, the sinusoidal oscillator with 90 degree phase difference or the quadrature oscillator (QO) are favorably role for usefulness in measurement system, communication system, power electronics system and etc [5-10]. The most of the SIMO, MISO and QO have been reported in literature [11-48]. They are based current-controlled current conveyor transconductance amplifier (CCCCTA) or current-controlled conveyor transconductance amplifier (CCCTA). The explanation of them can be detailed as follows. The proposed circuits in [11-12] can be achieved for biquad filter and quadrature oscillator without changing circuit configuration which is conveniently used. All circuits in [13-33] can be operated both filter in detail the SIMO [14, 16, 18, 23-28, 30-31] and the MISO [13, 15, 17, 19-22, 29- 30, 32-33] filter. They are benefited for tuning with electronic method which is proper to utilize in communication system/automatic systems. Furthermore, the proposed filters in [13-22, 33] use single active element that is prettied and smarted. As well, the filter circuits in [14- 16, 18-33] use grounded capacitors which are appropriated for fabrication to integrated circuit (IC). Simultaneously, the proposed circuits in [34-48] are capable of e[...]

Single Commercially Available IC: LT1228 Based Sinusoidal Oscillator DOI:10.15199/48.2019.04.41

Czytaj za darmo! »

The sinusoidal oscillator is extremely useful in communication systems, electronic power systems, and instrumentation/measurement systems [1-3]. Furthermore, a sinusoidal signal is a key part of training students in the laboratory [3-5] to become skilled electrical and electronic engineering. Today, sinusoidal oscillators are frequently used in research and a large number of results have now been published [1-22]. They employ different high performance active building blocks and exhibit several advantages such as: their condition and frequency of oscillation can be orthogonally or independently adjusted with the transconductance gains [3-9, 15-17, 20-22] or the parasitic resistances [2-4, 13, 16, 18] or voltage gains [1, 10, 12, 14]. The sinusoidal signal provides only voltage-mode [1-2, 7, 10-14, 19-20] or current-mode [3, 6, 8-9, 15, 18, 22]. Also, some circuits provide voltage and current-mode simultaneously [4-5, 16-17]. However, there are some drawbacks as it has been found that (i) there are many active devices [10-11, 13-14, 18-19] (ii) there are requirements for an extension or copy terminal of active devices [3-4, 7, 9, 15, 17] (iii) the use of floating capacitors may cause parasitic effects [8, 19, 21] (iv) the outputimpedance of voltage signal does not have low-impedance which is required for a voltage buffer [2, 5, 7, 10, 13-14, 17] (v) the active devices in [2, 4-5, 9, 11, 13-16, 18-20, 22] are not commercially available with IC, (vi) the results of oscillator circuits in [2, 4-5, 9, 11, 13-16, 18-20, 22] are only presented by computer simulation without an experimental implementation. A comparison of the proposed sinusoidal oscillator and recent research is shown in Table 1. This paper proposes a synthesis of the voltage-mode sinusoidal oscillator with gain control of the oscillation frequency. The proposed sinusoidal circuit enjoys several advantages such as (i) construction of a circuit is very simple empl[...]

 Strona 1