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1 V Tunable High-Quality Universal Filter Using Multiple-Input Operational Transconductance Amplifiers
(2024-05-01)
Kumngern, Montree
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Khateb, Fabian
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Kulej, Tomasz
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Knobnob, Boonying
This paper presents a new multiple-input single-output voltage-mode universal filter employing four multiple-input operational transconductance amplifiers (MI-OTAs) and three grounded capacitors suitable for low-voltage low-frequency applications. The quality factor (Q) of the filter functions can be tuned by both the capacitance ratio and the transconductance ratio. The multiple inputs of the OTA are realized using the bulk-driven multiple-input MOS transistor technique. The MI-OTA-based filter can also offer many filtering functions without additional circuitry requirements, such as an inverting amplifier to generate an inverted input signal. The proposed filter can simultaneously realize low-pass, high-pass, band-pass, band-stop, and all-pass responses, covering both non-inverting and inverting transfer functions in a single topology. The natural frequency and the quality factors of all the filtering functions can be controlled independently. The natural frequency can also be electronically controlled by tuning the transconductances of the OTAs. The proposed filter uses a 1 V supply voltage, consumes 120 μW of power for a 5 μA setting current, offers 40 dB of dynamic range and has a third intermodulation distortion of −43.6 dB. The performances of the proposed circuit were simulated using a 0.18 μm TSMC CMOS process in the Cadence Virtuoso System Design Platform to confirm the performance of the topology.
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Current-Mode Shadow Filter with Single-Input Multiple-Output Using Current-Controlled Current Conveyors with Controlled Current Gain
(2024-01-01)
Kumngern, Montree
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Khateb, Fabian
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Kulej, Tomasz
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Kyselak, Martin
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Lerkvaranyu, Somkiat
In this paper, a novel current-mode shadow filter employing current-controlled current conveyors (CCCIIs) with controlled current gains is presented. The CCCII-based current-mode shadow filters are resistorless and can offer a number of advantages such as circuit simplicity and electronic tuning capability. The proposed shadow filters offer five filtering functions, i.e., low-pass, high-pass, band-pass, band-stop, and all-pass functions, in the same topology. Furthermore, no component matching condition is required to realize all the transfer functions. The natural frequency and quality factor adjustment is possible by using the CCCII current gains without the need to use external amplifiers, all capacitors are grounded, and the filter terminals offer low-input and high-output impedance. To verify the functionality and feasibility of the new topologies, the proposed circuits were simulated using SPICE and the transistor model process parameters NR100N (NPN) and PR100N (PNP) from AT&T’s bipolar arrays ALA400-CBIC-R. The simulation results are consistent with the theory. The CCCII experimental setup was designed using commercially available 2N3904 (NPN) and 2N3906 (PNP) transistors with a supply voltage of ±2.5 V. The measurement results confirm the performance of the designed filters.
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Electronically Tunable Differential Difference Current Conveyor Using OTAs
(2021-04-01)
Sukhawit, Chuthitep
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Burapattanasiri, Bancha
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Torteanchai, Usa
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Lerkvaranyu, Somkiat
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Knobnob, Boonying
This paper presents a new electronically tunable differential difference current conveyor (DDCC) using operational transconductance amplifiers (OTAs). Unlike conventional DDCC, the proposed DDCC offers current gain between z- and x-terminal that can be controlled electronically by bias currents. The DDCC-based OTA can be investigated both simulation and experiment tests. The proposed DDCC is used to implement a quadrature oscillator to confirm workability.
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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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FDCCII -Based Third-Order Quadrature Sinusoidal Oscillator
(2018-08-20)
Wareechol, Eakluck
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Knobnob, Boonying
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Kumngern, Montree
This paper presents a new mixed-mode third-order quadrature sinusoidal oscillator employing one fully differential second-generation current conveyor (FDCCII), three capacitors and three resistors. The circuit provides two quadrature voltage outputs and two quadrature current outputs into single topology. The condition and frequency of oscillations can be orthogonally controlled. FDCCII-based 0.35±m CMOS process is used to implement and simulate the proposed oscillator.
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Current-Mode Quadrature Qscillator and Universal Filter Using ZC-CCFTAs
(2018-07-02)
Kumngern, Montree
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Knobnob, Boonying
In this paper, a new current-mode quadrature oscillator and universal filter employing two z-copy current controlled current follower transconductance amplifiers (ZC-CCFTAs) and two grounded capacitors is presented. Either a quadrature oscillator or a universal filter can be obtained into single topology. In case the circuit works as a quadrature oscillator, the condition of oscillation and the frequency of oscillation can be orthogonally controlled. In case the circuit works as a universal filter, low-pass, high-pass, band-pass, band-stop and all-pass filters can be simultaneously obtained. SPICE simulations results are presented to verify the validity of proposed circuit, which are consistent with theoretical predictions.
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Five-Input One-Output Universal Filter Using Simple CMOS OTAs
(2018-07-02)
Knobnob, Boonying
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Suksaibul, Pichai
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Kumngern, Montree
This paper presents a new five-input one-output voltage-mode universal filter using simple operational transconductance amplifiers (OTAs). The circuit uses six OTAs and two grounded capacitors. The circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass filters into one topology. The natural frequency and the quality factor of filters can be electronically controlled by adjusting the bias currents. Also, the circuit possesses high input impedance for all filtering functions. The simulation results have been verified by PSPICE simulations using 0.18 μm CMOS process from TSMC.
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High-input impedance four-input one-output voltage-mode universal filter using OTAs
(2014-01-01)
Kumngern, Montree
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Suksaibul, Pichai
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Knobnob, Boonying
This paper presents a new electronically tunable voltage-mode universal filter with four-input one-output using six single-ended operational transconductance amplifiers, two grounded capacitors and two MOS resistors. The proposed circuit can realize of lowpass, bandpass, highpass, bandstop and allpass filters, without component-matching conditions and inverting input signals requirements. The natural frequency and the quality factor can be tuned orthogonally and electronically by adjusting the bias currents. The filter offers the features of high input impedances, low active and passive sensitivities and use of grounded passive components which is ideal for integrated circuit implementation. The workability of the proposed circuit is confirmed using PSPICE simulators. © 2014 IEEE.
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Voltage-mode SIMO OTA-C universal filter
(2011-12-01)
Kumngern, Montree
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Sarasri, Jimlee
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Knobnob, Boonying
This paper presents a new voltage-mode single-input multiple-output universal filter employing five simple operational transconductance amplifiers, two grounded capacitors and one grounded resistor. The proposed filter provides low-pass, band-pass and high-pass voltage responses. The natural frequency and the quality factor of the filter can be controlled orthogonally and electronically by adjusting the bias currents of OTAs. The filter characteristics of the proposed circuit are simulated using PSPICE simulations to confirm the presented theory. © 2011 IEEE.
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CMOS precision full-wave and half-wave rectifier
(2011-08-25)
Virattiya, Athipong
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Knobnob, Boonying
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Kumngern, Montree
This paper presents a new current-mode precision rectifier using CMOS technology. The system comprises a current comparator, current mirrors and diodes that can realize either a half-wave rectifier or a full-wave rectifier into a single system by appropriately adjusting the current gain of a current mirror. The proposed circuit offers low-voltage supply, low-power dissipation and wide bandwidth. The simulation results can be confirmed the operation and performance of the proposed rectifier. © 2011 IEEE.

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