KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Prommee, PipatSubject: search.filters.subject.OTA

Search Results

Now showing 1 - 8 of 8
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    High-order chebyshev notch filter based on MO-OTA and its application in Biosensor
    (2021-05-19)
    Srisamranrungrueang, Siradanai
    ;
    Wongprommoon, Natapong
    ;
    Prommee, Pipat
    This paper presents a high-order notch filter based on multiple output OTA (MO-OTA). The signal flow graph (SFG) method is applied as a design procedure based on the RLC prototype. The RLC Chebyshev low-pass filter is used as an original prototype. The network transform is applied to convert the LPF to a notch filter. From the SFG, the denormalized network can be replaced by integrators and differentiators. The current-mode lossy and lossless types of integrator and differentiator are realized by using CMOS MO-OTA and grounded capacitor. A simple and low-complexity structure is achieved and constructed by 9 MO-OTAs and 6 grounded capacitors. The stop-band frequency between 10Hz-1kHz can be electronically tuned by the bias current between 1-100 μA. The low power supply ±0.75V is required which consumes the power 15mW at 100μA bias current. An application in ECG signal with power line interference (PLI) removal is included.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Tunable Elliptic High-pass Filter based on Differentiator Approach
    (2020-09-23)
    Wongprommoon, Natapong
    ;
    Pienpichayapong, Peradol
    ;
    Prommee, Pipat
    This article presents a design of high-order Elliptic ladder high-pass filter based on differentiators and integrator approach. Since the design of general Elliptic high-pass filter can be realized with high complexity, moreover the high-pass filter held very complicated design. The differentiators and integrator are deployed for synthesis high-pass filter from its Signal Flow Graph (SFG). The Elliptic RLC high-pass filter is transformed by using the original Elliptic RLC low-pass filter. The SFG is straightforward analyzed from the Elliptic RLC high-pass filter prototype. The SFG describes three differentiators and one integrator. The operational transconductance amplifiers (OTA) and grounded capacitors are preferred to implement the differentiators and integrator. The proposed filter contains only 7 OTAs with 4 grounded capacitors. The frequency responses can be varied between 100kHz and 10MHz by manipulating the bias current (IB) from 1μA to 100μA. The performances and the capability are carried out by using PSpice simulation which agreed to the theory.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Frequency tunability of fractance device based on OTA-C
    (2019-07-01)
    Prommee, Pipat
    ;
    Wongprommoon, Natapong
    ;
    Sotner, Roman
    This paper presents the realization of fractance device by using an approximating function. From this function, we can obtain the characteristic of fractional passive element with constant phase at specific bandwidth. The approximating functions can be realized by RC network. Unfortunately, the RC passive network is not suitable for integration and lack of interesting features as well as frequency tuning. Hence, this paper proposes the realization of fractional device based on OTA-C without any resistor. The rational functions were simplified to series expansion that can realize by low-complexity OTA-C. Due to the biomedical applications, the device order of 0.507 and 0.766 are given in this paper. The results show the magnitudes and phases in agreement with the theory and also approximating functions. Frequency tunability feature is obtained from 100Hz to 10kHz by adjusting I<inf>B</inf> from 1μ A to 100 μ A. PSpice simulation results are carried out to confirm with the theory.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    OTA-C based compact Low-pass Elliptic Filter
    (2018-12-24)
    Wongprommoon, Natapong
    ;
    Manositthichai, Narongsak
    ;
    Prommee, Pipat
    This article described a compact structure simulating electronically controlled high-order Elliptic filter based on OTA-C. The signal flow graph (SFG) is deployed as a synthesis method from RLC prototype. The synthesis of Elliptic filter using SFG is normally required the integrators and very low current/voltage gain. This proposed filter is synthesized by using SFG and no required any current/voltage gains. From its SFG, the OTA-C based integrators and differentiators can be realized. The completed circuit is using only grounded capacitors with low-complexity structure. The frequency response of proposed filter can be tuned through the equality of OTA's bias currents. The supply voltage is using ±. The comparison of proposed filter and RLC prototype characteristics are verified by PSpice that the results are in good agreement.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Fully tunable all-pass filter using OTA and its application
    (2016-11-28)
    Saising, Ekkapong
    ;
    Prommee, Pipat
    This paper proposes a realization of fully tunable all-pass (AP) filter and its application. Three Multiple Outputs Operational Transconductance Amplifiers (MOOTAs) and a grounded capacitor are used for realizing an all-pass filter which is able to tune in both of the frequency response and gain. The frequency response and gain are independently tuned through particular bias current. The advantage of independent tunable gain is of AP filter that can be widely used in many applications as well as the sinusoidal oscillator. A multiphase sinusoidal oscillator (MSO) using loop-back of three cascaded all-pass sections is raised as an application. Three MOOTAs and a grounded capacitor are constructed as current-mode APN. The PSpice simulations results are described in two parts, AP filter and MSO. It shows the magnitude and phase responses can be independently tuned. The MSO current and voltage outputs are equally spaced in phase of 360/n degree. The harmonic distortion of the sinusoidal output is less than 0.64%.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    OTA high pass filter-based multiphase sinusoidal oscillator
    (2015-10-09)
    Thongdit, Preecha
    ;
    Kunto, Terdsak
    ;
    Prommee, Pipat
    This paper proposes a new approach to implement a multiphase sinusoidal oscillator using loop-back of n-cascaded high-pass filters form. Two basic CMOS Multiple Outputs Operational Transconductance Amplifier (MOOTA) and grounded capacitors are constructed as a current-mode high-pass filter. Gain and frequency response of high-pass filter can be independently tuned through the particular bias current. It is, therefore, orthogonally of oscillation condition and frequency oscillation is obtained through bias currents of each OTA. Multiphase sinusoidal current output and voltage output can be obtained with equally space in phase of 360/n degree. Third-order high-pass filter has been raised to confirm the theoretical agreement. Low-harmonic distortion of achieved sinusoidal output less than 0.75% is obtained. The performances are carried out by PSpice for confirm its attractive characteristics.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Realization of tunable pole-Q current-mode OTA-C universal filter
    (2010-10-01)
    Prommee, Pipat
    ;
    Pattanatadapong, Thanate
    A realization of a current-mode operational transconductance amplifiercapacitor (OTA-C) universal filter with tunable pole-Q is proposed. A biquadratic band-reject function is used as the initial synthesis function based on three integrator blocks. Consequently, the proposed filter uses a total of three multiple-output OTAs and three grounded capacitors. Five types of transfer functions, namely, low-pass, high-pass, band-pass, band-reject, and all-pass responses, can be obtained without changing the circuit topology. The pole-Q (Q0) and the pole-frequency (?0) parameters are independently tuned. The Q0 and ?0 parameters are electronically tuned by adjusting the transconductance gains of the OTAs. Furthermore, Q0 can be tuned by varying the capacitor manually without affecting ?0. SPICE simulation results of the proposed filter are presented. © Springer Science+Business Media, LLC 2010.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Realization of OTA-C current-mode universal filter based on two type integrators loop
    (2007-12-01)
    Prommee, Pipat
    ;
    Somdunyakanok, Montri
    ;
    Angkeaw, Krit
    ;
    Dejhan, Kobchai
    A universal current-mode active filter based on 2 types of integrator, lossy and lossless integrators, is presented. The biquadratic transfer function is obtained by the two integrators loop. The proposed circuit employs only 2 multiple output OTAs (MO-OTA) and 3 capacitors. The parameter Q<inf>P</inf> can be wide-range tuned independent from the ω<inf>P</inf> either changing of capacitor and transconductance gains. Moreover, the four different kind filter functions as lowpass, highpass, bandpass and band-reject response can be also obtained without changing circuit topology. The parameters ω<inf>p</inf> can be electronically tuned through adjusting the transconductance gains of the OTAs. The simulation results have been carried out by PSpice. © 2007 IEEE.