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Fully differential fifth-order dual-notch low-pass filter for portable EEG system
(2022-03-01)
Kumngern, Montree
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Khateb, Fabian
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Kulej, Tomasz
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Arbet, Daniel
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Akbari, Meysam
This paper presents a new fully differential fifth-order dual-notch low-pass filter based on multiple-input multiple-output operational transconductance amplifiers (MIMO OTA). This work shows that MIMO OTA-based fifth-order dual-notch filter can reduce the number of used OTAs, resulting in simplified realization and low-power consumption. The multiple-input OTA is obtained by using the multiple-input dynamic threshold MOS (DTMOS) technique without additional differential pairs. A simple common-mode feedback technique has been used; thus, fully differential OTA can be easily obtained. The proposed dual-notch low-pass filter can be applied to electroencephalogram (EEG) detection system to reject the 50 Hz powerline interference and the third harmonic 150 Hz. The proposed filter has been simulated using Cadence environment with 0.18 µm TSMC CMOS process. The power supply of 0.5 V is used and the total power consumption of the MIMO OTA is 17.5 nW. The proposed filter provides 49.7 dB dynamic range for 1% total harmonic distortion (THD) for a sine input signal of 250 mV<inf>pp</inf> at 10 Hz. At 50 Hz and 150 Hz the notch depths of attenuation are respectively −37.2 dB and −47.4 dB. The pre-layout simulation results are in good agreement with the theory.
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Voltage Differencing Buffered Amplifier-Based Novel Truly Mixed-Mode Biquadratic Universal Filter with Versatile Input/Output Features
(2022-02-01)
Faseehuddin, Mohammad
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Herencsar, Norbert
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Shireen, Sadia
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Tangsrirat, Worapong
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Md Ali, Sawal Hamid
In this paper, a first-of-a-kind mixed-mode universal filter employing three VDBAs and three passive components, is proposed. The filter operates in all four modes and provides all five filter responses, namely voltage-mode (VM), current-mode (CM), trans-impedance-mode (TIM), or trans-admittance-mode (TAM). Additionally, the same filter topology can also work as a CM singleinput-multi-output (SIMO) filter. A state-of-the-art comparison of various ‘voltage differencing’ variants of the voltage differencing buffered amplifier (VDBA)-based SIMO/MISO (single-input-multi-output/multi-input-single-output)-type biquad filters further highlight the significance of the presented research. In the proposed no passive component matching is required for generating the filter responses. The filter circuit also provides inbuilt tunability of the quality factor independent of the pole frequency. The non-ideal frequency dependent gain and component sensitivity analyses of the filter were also performed. The Silterra Malaysia 0.18 µm process design kit (PDK) is employed to design and validated the proposed VDBA-based filter using the Cadence design software. The simulation results closely follow the theoretical predictions. To further verify the practical feasibility of the proposed filter, an experimental evaluation is also completed. The VDBA-based filter is implemented using off-the-shelf operational transconductance amplifiers Intersil CA3080, Texas Instruments LF356 op-amp, and Analog Devices AD844s. The filter is designed for a characteristic frequency of 100 kHz. The time and frequency domain measurement results indicate the proper functioning of the filter.
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Programmable Universal Filter and Quadrature Oscillator Using Single Output Operational Transconductance Amplifiers
(2021-01-01)
Knobnob, Boonying
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Torteanchai, Usa
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Kumngern, Montree
This paper presents a new programmable universal filter and quadrature oscillator based on the single output operational transconductance amplifiers (OTAs). The proposed universal filter and quadrature oscillator can be achieved into single topology by programming analog switches. When the circuit performs as a universal filter, it can realize low-pass, high-pass, band-pass, band-stop and all-pass filters with orthogonal and electronic controls of the natural frequency and quality factor. When the circuit performs as a quadrature oscillator, it provides a three-phase quadrature output signal which the condition and frequency of oscillations can be controlled orthogonally and electronically. The proposed structure can be realized based on the single output OTAs which are easily implemented as both commercially available integrated circuits (ICs) as OTAs and complementary metal-oxide semiconductor (CMOS) OTAs as IC forms. SPICE simulation using standard 0.18 µm CMOS process is used for investigating the performance of the proposed circuit whereas the workability of new circuit is confirmed by LM13600 discrete-component integrated circuits as OTAs.
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Versatile electronically tunable voltage-mode filter based on simple CMOS OTAs
(2017-12-01)
Torteanchai, Usa
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Yutthanaboon, Sathian
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Sarsitthithum, Kanok
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Kumngern, Montree
In this paper, a new versatile electronically controllable voltage-mode biquadratic filter with four inputs and three outputs based on simple CMOS operational transconductance amplifiers (OTAs) is presented. By appropriately selecting the input and output terminals, the proposed filter can work as either a single-input multiple-output (SIMO) or a multiple-input single-output (MISO) biquadratic filter without changing the circuit topology. When it is a function of SIMO filter, the circuit provides band-pass (BP), low-pass (LP) and band-stop (BS) voltage responses and using grounded capacitors. The all-pass (AP) and high-pass (HP) voltage responses can be obtained using addition and subtraction circuits. Continually, when it is a function of MISO filter, the circuit can realize five standard non-inverting and inverting filtering functions such as LP, BP, HP, BS and AP filters. Both the circuit functions offer an electronic control of the natural frequency through adjusting the bias currents of OTAs. The filters are absent from active and passive component-matching condition and invertingtype input signal requirements for realizing all filtering responses. The passive and active sensitivities are low. The performances of the proposed filter can be confirmed by PSPICE simulation results.
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Voltage-mode OTA-C multifunction biquadratic filter with four inputs and four outputs
(2012-01-01)
Kumngern, Montree
This paper presents an electronically tunable versatile multifunction voltage-mode biquadratic filter with four inputs and four outputs employing six single-ended operational transconductance amplifiers and two grounded capacitors, which is very suitable for integrated circuit implementation. The proposed circuit can simultaneously realize low-pass, band-pass, high-pass, band-stop and all-pass voltage responses, without inverting-type input signal and component-matching condition requirements. The natural frequency and the quality factor can be orthogonally controlled. The active and passive sensitivities are low. PSPICE simulation results are given to confirm the presented theory. © 2012 IEEE.
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Mixed-mode universal filter using OTAs
(2012-01-01)
Kumngern, Montree
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Junnapiya, Somyot
This paper presents an electronically tunable versatile biquadratic filter. Unlike the typical voltage-mode and current-mode filter, the proposed filter can realize voltage-mode, current-mode, transconductance-mode and transresistance-mode transfer functions without changing the circuit topology, called a mixedmode filter. The proposed structure employs six operational transconductance amplifiers, two grounded capacitors and one external resistor that provides following advantages: realization of low-pass, band-pass, high-pass, band-stop and all-pass filter responses; orthogonal control of the natural frequency and the quality factor; employment of grounded capacitors which is more suitable for integrated circuit implementation; low active and passive sensitivities. Simulation results are also given to confirm the presented theory. © 2012 IEEE.
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OTA-based voltage-mode universal biquadratic filter with single-input multiple-output
(2012-01-01)
Kumngern, Montree
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Junnapiya, Somyot
This paper presents an electronically tunable voltagemode universal biquadratic filter with single input and five outputs employing six operational transconductance amplifiers, two grounded capacitors and one resistor. The proposed circuit can realize voltage-mode low-pass, band-pass, high-pass, bandstop and all-pass filter responses without inverting-type input signal requirements. The natural frequency and the quality factor can be orthogonally controlled. Also the natural frequency can be electronically tuned. The active and passive sensitivities of the circuit are low. PSPICE simulation results are provided to demonstrate the theoretical analysis. © 2012 IEEE.
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A 1 GHz CMOS analog equalizer for perpendicular magnetic recording
(2010-12-01)
Meksiri, Sukarasut
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Vichienchom, Kasin
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Wilairat, Decha
This paper describes the design of a CMOS analog discrete-time equalizer for perpendicular magnetic recording (PMR) read channel. In this design the structure of analog FIR filter that places rotating switch matrix between DAC and multiplier has been proposed. It reduces an accumulative switching error in analog samples due to rotating switch matrix. A 7-tap filter circuit based on GPR2 target was designed and simulated using TSMC 0.18 μm CMOS process parameters. Simulation results show good agreement with the results of the system level simulation. At 1 GHz sampling frequency the equalizer dissipates 1.5 mW. ©2010 IEEE.
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A Versatile CMOS Analog Multiplier
(2003-01-01)
Chaisayun, Ittipong
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Dejhan, Kobchai
This paper describes a novel four-quadrant analog multiplier. It is comprised of two mixed signal circuits, a voltage adder circuit, a voltage divider circuit and a basic multiplier, Its major advantages over the other analog multipliers are: this design has single ended inputs, the geometry of all CMOS transistors are equal, and its output can be the product of two signal currents, the product of two signal voltages, or the product of a signal current and a signal voltage. Second-order effects are analyzed, and the experimental and simulative results that confirm the theoretical analysis are carried out.
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An arbitrary power law device based on integrators
(2000-12-01)
Kiranon, Wiwat
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Loescharataramdee, Chariya
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Petchakit, Wijittra
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Sangpisit, Wipa
A new simple arbitrary power law device implemented from integrators along with the sample-and-hold technique is presented. The number of the integrators indicates the index of the power law. Part of the integrators determine an appropriate time interval to be used to control the sample-and-hold circuit to extract the correct output. To test the validity and value of the proposed method, numerous power law functions have been experimented. The experimental results show very close agreement with the theoretical analysis. In addition, the measurement output, possibly as large as a few volts, is obtained with extreme precision. © 2000 IEEE.

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