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Author: search.filters.author.Chaichana, AmornchaiSubject: search.filters.subject.Electronic control

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    Voltage-mode biquad filter using three lt1228s with independent and electronic control of center frequency and quality factor
    (2023-01-01)
    Wai, May Phu Pwint
    ;
    Jaikla, Winai
    ;
    Chaichana, Amornchai
    ;
    Suwanjan, Peerawut
    ;
    Chanapromma, Chaiyan
    In this paper, we describe a voltage-mode (VM) biquad universal filter with one input and four outputs that can be tuned electronically. The filter proposed here is composed of three LT1228 commercial integrated circuits (ICs), seven resistors and two grounded capacitors. The proposed versatile biquad filter simultaneously provides four filtering functions: An inverting low-pass filter (LP), an inverting high-pass filter (HP), a non-inverting bandpass filter (BP), and an inverting notch filter (BR) without changing its topology. Employing two grounded capacitors minimizes the influence of parasitic resistances and capacitances on the proposed circuit's performance. Also, the output voltage nodes of the HP and BR functions have low output impedances. This means that these two filtering functions don't need voltage buffers to connect to other voltage-mode topologies. The center frequency (ω<inf>0</inf>) of the presented filter is electronically controlled and does not influence the quality factor (Q). In addition, they can also be tuned linearly without affecting each other. PSPICE software was used to analyze the modelling results, while a laboratory experiment was performed using LT1228 commercial ICs.
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    Single commercially available ic-based electronically controllable voltage-mode first-order multifunction filter with complete standard functions and low output impedance
    (2021-11-01)
    Jaikla, Winai
    ;
    Buakhong, Unchittha
    ;
    Siripongdee, Surapong
    ;
    Khateb, Fabian
    ;
    Sotner, Roman
    This paper presents the design of a voltage-mode three-input single-output multifunction first-order filter employing commercially available LT1228 IC for easy verification of the proposed circuit by laboratory measurements. The proposed filter is very simple, consisting of a single LT1228 as an active device with two resistors and one capacitor. The output voltage node is low impedance, resulting in an easy cascade-ability with other voltage-mode configurations. The proposed filter provides four filter responses: low-pass filter (LP), high-pass filter (HP), inverting all-pass filter (AP−), and non-inverting all-pass filter (AP+) in the same circuit configuration. The selection of output filter responses can be conducted without additional inverting or double gains, which is easy to be controlled by the digital method. The control of pole frequency and phase response can be conducted electronically through the bias current (I<inf>B</inf>). The matching condition during tuning the phase response with constant voltage gain is not required. Moreover, the pass-band voltage gain of the LP and HP functions can be controlled by adjusting the value of resistors without affecting the pole frequency and phase response. Additionally, the phase responses of the AP filters can be selected as both lagging or leading phase responses. The parasitic effects on the filtering performances were also analyzed and studied. The performances of the proposed filter were simulated and experimented with a ±5 V voltage supply. For the AP+ experimental result, the leading phase response for 1 kHz to 1 MHz frequency changed from 180 to 0 degrees. For the AP− experimental result, the lagging phase response for 1 kHz to 1 MHz frequency changed from 0 to −180 degrees. The design of the quadrature oscillator based on the proposed first-order filter is also included as an application example.
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    Electronically controlled voltage mode first order multifunction filter using low-voltage low-power bulk-driven OTAs
    (2019-09-01)
    Jaikla, W.
    ;
    Talabthong, Pruedchawat
    ;
    Siripongdee, Surapong
    ;
    Supavarasuwat, Piya
    ;
    Suwanjan, Peerawut
    In this paper, a new versatile voltage mode first order filter using low-voltage low-power bulk-driven OTAs is presented. The proposed filter with two high impedance input-voltage nodes and single output-voltage node consists of two OTAs, one grounded capacitor and one grounded resistor. Three filtering responses, low-pass (LP), high-pass (HP) and all-pass (AP) are obtained by appropriately applying the input signal into the input nodes. The natural frequency (ω<inf>0</inf>) can be electronically tuned by the bias current. In case of all-pass filter, its phase response is electronically controlled by adjusting only single bias current. With this feature, it doesn't need to simultaneously change two bias currents or two passive element values. The performances of the proposed filter were evaluated via PSPICE simulations using CMOS 0.18 μm TSMC technology parameters (level 7) with ±0.4 V supply voltages. The proposed filter consumes 47.2 μW. To obtain the actual testing results, the proposed filter was also experimented using commercially available IC, LM13700. Moreover, the three phases sinusoidal oscillator based on proposed first order high-pass filter was designed and investigated by PSPICE simulation and experiment.