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16-nW 0.5-V low-pass filter for bio-signal applications
(2025-01-01)
Phatsornsiri, Punnavich
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Kumngern, Montree
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Khateb, Fabian
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Torteanchai, Usa
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Wongprommoon, Natapong
A low-voltage, ultra-low power fully differential low-pass filter for bio-signal applications using multiple-input fully differential operational transconductance amplifiers (OTA) is presented in this article. The multiple inputs of OTA can be achieved using multiple-input dynamic threshold MOS transistor (MIDT-MOST) technique. The novelty of this work is to exhibit the proposed filter using multiple-input OTAs, which leads to a reduction in the number of active OTAs and power consumption. The fourth-order low-pass filter that is cascaded by two second-order filters has been presented. The fourth-order low-pass filter is designed and simulated in the Cadence environment using the 0.18 μm CMOS technology from TSMC at a supply voltage of 0.5 V. The simulation results show that the filter consumes 16 nW of power at a bandwidth of 110 Hz, has a total harmonic distortion (THD) of 1 % at 204.96 mV input amplitude, and provides dynamic range of 69.24 dB. These results indicate that the proposed low-pass filter can be applied to bio-signal processing applications.
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0.5-V Mixed-Mode Universal Active Filter Using Multiple-Input OTAs
(2024-01-01)
Phatsornsiri, Punnavich
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Kumngern, Montree
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Nonthaputha, Thanat
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Asa, Ekachai
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Singsathien, Jateslid
This study introduces new 0.5 V, ultra-low power mixed-mode universal analog filter applying multiple-input operational transconductance amplifiers (MI-OTAs). The filter configuration based on MI-OTAs and two grounded capacitors to actualize a mixed-mode universal filter that can produce four modes second-order filters, that is low-pass, high-pass, band-pass, band-stop and all-pass filters, namely voltage-mode, current-mode, transimpedance mode, transconductance-mode, by appropriate selecting input signals. The filter's natural frequency can be electronically controlled. The mixed-mode filter was analyzed using CMOS 0.18μm process simulation from TSMC, operating with a 0.5 V power supply.
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0.5-V 16 nW Low-Pass Filter for Bio-Signal Applications
(2024-01-01)
Phatsornsiri, Punnavich
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Kumngern, Montree
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Khateb, Fabian
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Kulej, Tomasz
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Wongprommoon, Natapong
This study presents a low-voltage, ultra-low power fully-differential low-pass filter for bio-signal applications using multiple-input fully differential operational transconductance amplifiers (MIFD OTA). This work shows that a low-pass filter using multiple-input OTA can reduce the number of OTAs and power consumption. The low-pass filter can be applied to biomedical signal processing applications. The low-pass filter was simulated using the 0.18 μm (CMOS) technology from TSMC with a supply voltage of 0.5 V. The simulation result shows that the filter has a static power consumption of 16 nW and a 140-Hz bandwidth when operating from a supply voltage of 0.5 V. Input frequency of 10 Hz with an amplitude of 220 mV, the new proposed filter provides a dynamic range of 72.2 dB, total harmonic distortion of 1 %.
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Current-Mode First-Order Versatile Filter Using Translinear Current Conveyors with Controlled Current Gain
(2023-07-01)
Kumngern, Montree
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Jongchanachavawat, Wirote
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Phatsornsiri, Punnavich
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Wongprommoon, Natapong
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Khateb, Fabian
This paper offers a new current-mode first-order versatile filter employing two translinear current conveyors with controlled current gain and one grounded capacitor. The proposed filter offers the following features: realization of first-order transfer functions of low-pass, high-pass, and all-pass current responses from single topology, availability of non-inverting and inverting transfer functions for all current responses, electronic control of current gain for all current responses, no requirement of component-matching conditions for realizing all current responses, low-input impedance and high-output impedance which are required for current-mode circuits, and electronic control of the pole frequency for all current responses. The proposed first-order versatile filter is used to realize a quadrature sinusoidal oscillator to confirm the advantage of the new topology. To confirm the functionality and workability of new circuits, the proposed circuit and its application are simulated by the SPICE program using transistor model process parameters NR100N (NPN) and PR100N (PNP) of bipolar arrays ALA400-CBIC-R from AT&T.
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1.2 V differential difference current conveyor using MIGD MOST technique and its applications
(2023-01-01)
Kumngern, Montree
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Khateb, Fabian
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Phatsornsiri, Punnavich
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Jongchanachavawat, Wirote
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Kulej, Tomasz
This paper presents a new differential difference current conveyor (DDCC), realized using multiple-input gate-driven MOS transistor (MIGD MOST) technique. The application of MIGD MOST can reduce the number of differential pairs in the input stage of the DDCC, thus simplifying its overall structure. Unlike previous DDCC, the output stage of the circuit operates in super class-AB, that offers low static power consumption, high load driving capability and improved gain-bandwidth product (GBW).The proposed DDCC can work with the supply voltage of 1.2 V and consumes 44.2 μW of power. The proposed DDCC has been used to realize a versatile circuit that can work as a universal filter or a quadrature oscillator into a single topology. When the circuit works as a universal filter, it can realize low-pass, band-pass, high-pass, band-stop and all-pass voltage responses. The natural frequency and the quality factor of these responses can be orthogonally controlled. When the circuit works as a quadrature oscillator, the condition and the frequency of oscillators can be orthogonally controlled. The proposed MIGD DDCC and the proposed universal filter and quadrature oscillator have been simulated with SPICE, using 0.18 μm CMOS process parameters to prove the functionality and workability of the new circuits.
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Current-Mode Universal First-Order Analog Filter Using CCCIIs
(2023-01-01)
Phatsornsiri, Punnavich
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Torteanchai, Usa
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Wongprommoon, Natapong
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Kumngern, Montree
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Jongchanachavawat, Wirote
This paper presents a new current-mode first-order universal analog filter using current-controlled current conveyors (CCCIIs). The proposed circuit can realize first-order sections such as all-pass, low-pass, high-pass filters with both non-inverting and inverting transfer functions into single topology. The pole frequency of these filters can be controlled electronically. The output terminals possess high impedance level which is required for cascading of current-mode circuits. The proposed analog filter is verified using SPICE simulation. The CCCII has been simulated using the 0.18 µm CMOS technology with a supply voltage of 1.8 V. The simulation result can show that it agrees well with theory.
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1.2 v Differential Difference Current Conveyor Using MIGD MOST Technique
(2022-01-01)
Phatsornsiri, Punnavich
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Torteanchai, Usa
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Rattanasuttikan, Manurak
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Jongchanachavawat, Wirote
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Kumngern, Montree
This paper presents a new differential difference current conveyor (DDCC) using multiple-input gate-driven MOS transistor (MIGD MOST) technique. The MIGD MOST technique can be reduced the number of transistor differential pair. The differential input stage is implemented by flipped voltage follower to obtain low power supply requirements. Thus, the proposed DDCC is capable to working with a supply voltage of 1.2 V and it consumes a 44.2 μW of power dissipation. The simulations were performed with PSPICE using the 0.18 μm CMOS technology to prove the workability of the new circuit.
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Validation of acoustic emission railway track crack analysis using MFCC
(2019-07-01)
Vongserewattana, Narate
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Suwansin, Wara
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Phasukkit, Pattarapong
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Phatsornsiri, Punnavich
Nowadays, railway track crack detection system has many techniques, such as Ultrasonic Techniques [1], Electromagnetic Techniques [2] and GSM Techniques [3]. For the propose of this research, we study characteristics of railway track using acoustic emission, the device which is widely used for application such as crack detection in aerospace space grade steel [4], detection of defect s in rolling element bearing [5], fatigue crack growth detection [6]. And use the MFCC ('Mel - Frequency Cepstral Coefficients') [7] method which is generally used for low frequency to extract the feature of each railway track. According to that, we chose to adjust the MFCC method for an acoustic feature extraction in order for condition to be suitable used for this system, because the railway track crack detection system, we are interested in concentrates at 100-400 kHz. According to the result of the experiment, it shows that this technique is able to extract and classify feature of the railway track crack.
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0.5-V fully differential allpass section
(2017-01-18)
Phatsornsiri, Punnavich
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Kumngern, Montree
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Khateb, Fabian
This paper presents a new first-order allpass filter using bulk-driven transconductor which is suitable for biological signal processing applications. The proposed filter employs one transconductor, one resistor and two capacitors. The bulk-driven MOS transistor technique is used to provide 0.5 V supply voltage operation. The workability of the proposed topology is expressed through PSPICE simulators using TSMC 0.18 μm n-well CMOS process. Simulation results show that the circuit consumes the power of 11.7 μW and has total harmonic distortion (THD) of 1% for input signal of 30 mV<inf>P-P</inf>.
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Quadrature Oscillator Using Operational Transresistance Amplifiers
(2016-07-02)
Torteanchai, Usa
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Phatsornsiri, Punnavich
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Kumngern, Montree
This paper presents a new quadrature oscillator using operational transresistance amplifiers (OTRAs). The use of OTRA as active elements which offers low parasitic parameters, high slew rate and high bandwidth independent of the gain, precision of oscillating frequency can be achieved. The oscillating frequency and oscillating condition of proposed oscillator can be independently controlled. Also output terminals are possessed low impedance level which can be directly connected to the load without any buffer circuits. Simulation results verifying the theoretical analysis are included to confirm proposed structure. From simulation results, it can be expressed that the simulation result is very agree well with theory.

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