KMITL

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

Browse

Search Results

Now showing 1 - 6 of 6

Some of the metrics are blocked by your
consent settings
New Resistor-Less Electronically Tunable OTA-based Fully Floating FDNR Simulator
(2023-05-01)
Bhardwaj, Kapil
;
Srivastava, Mayank
;
Tangsrirat, Worapong
A floating FDNR using four OTAs (operational transconductance amplifiers) and two grounded capacitances have been reported in this article. As per the reviewed literature, the proposed floating FDNR is based upon a minimum number of transistors with a resistor-less and grounded capacitances based structure as compared to any other FDNR simulators and can be considered the most compact configuration ever reported. It offers some excellent features like; electronically tunable behavior, purely resistor-less architecture, no restraint of parameter values matching, use of only grounded capacitances, and fully symmetric floating architecture. We have investigated the circuit for port parasitics and non-ideal gains of the employed OTAs and presented the analysis. It is found that the circuit nature remains almost unchanged in non-ideal conditions. The influence of frequency-dependent transconductance has also been analyzed. The FDNR simulation through the reported circuit has been verified through the PSPICE-generated simulation results. The higher-order CDR filtering circuit application of the proposed FDNR has also been reported and checked through simulations. The presented OTA-based FDNR has been experimentally verified through the CA3080 IC-based implementation and results are discussed.
Some of the metrics are blocked by your
consent settings
31.3 nW, 0.5 V Bulk-Driven OTA for Biosignal Processing
(2023-01-01)
Kumngern, Montree
;
Kulej, Tomasz
;
Khateb, Fabian
This paper presents a new extremely low-voltage low-power bulk-driven (BD) operational transconductance amplifier (OTA) realized for low frequency biosignal processing. The CMOS structure of the OTA utilizes bulk-driven and self-cascode techniques in the subthreshold region, supporting the operation with the supply voltage ( V- DD ) as the threshold voltage ( VTH ) of a single MOS transistor, i.e., V DD = V TH = 0.5 V, while offering nano power consumption (31.3 nW for 15 nA nominal setting current). Using the extremely low-voltage and low-power OTA in biosignal processing enables extending the lifetime of applications that are powered by battery or energy harvesting sources. The OTA has a 54.7 dB low frequency gain, 6.18 kHz gain bandwidth and 75° phase margin at 15 pF load capacitance. The proposed OTA has been used to realize a bandpass filter (BPF) with adjustable gain for electrocardiogram (ECG) signal processing. The higher cutoff frequency of the BPF is adjustable electronically by a setting current and the BPF's gain can be adjusted by capacitors value. The total harmonic distortion (THD) of the BPF is -53.56 dB, the input integrated input-referred voltage noise is 17.9 V rms , the common mode rejection ratio (CMRR) is 75 dB and the power supply rejection ratio (PSRR) is 87.7 dB. The BPF was designed in the Cadence program using 0.18 m CMOS technology from TSMC. The simulation results agree with the presented theory.
Some of the metrics are blocked by your
consent settings
0.5-V High Linear and Wide Tunable OTA for Biomedical Applications
(2021-01-01)
Khateb, Fabian
;
Kulej, Tomasz
;
Akbari, Meysam
;
Kumngern, Montree
This paper presents a low-voltage nano-power multiple-input operational transconductance amplifier (MI-OTA) with high linearity performance and increased input voltage swing. The enhanced performances are achieved thanks to employing several techniques as the bulk-driven, source-degeneration, self-cascode and negative conductance along with the concept of the input signal attenuation formed by multiple-input MOS transistor. The MI-OTA is widely tunable that serves for biological signals processing. A 3rd-order Butterworth band-pass filter (BPF) for electrocardiogram (ECG) signal processing with 55.8 dB dynamic rang is presented. The MI-OTA circuit is designed for 0.5V voltage supply and offers a 0.22% total harmonic distortion (THD) for 0.2Vpp input signal with total power consumption of 13.4nW. Extensive simulation results including Monte Carlo analysis and process, voltage, temperature (PVT) corners using the 0.18 μm CMOS technology from TSMC confirm the characteristics of the proposed MI-OTA and the filter.
Some of the metrics are blocked by your
consent settings
A Practical Implementation of Memristor Emulator Circuit Based on Operational Transconductance Amplifiers
(2019-01-01)
Thongrak, Apichata
;
Sitjongsataporn, Suchada
;
Khunkhao, Sanya
;
Moungnoul, Phichet
As described of electrical circuit have been considering that there are three fundamental passive twoterminal circuit elements; resistor, capacitor, and inductor respectively. In 1971, Prof. L. Chua proposed and described memristor which defines the relationship between magnetic flux and charge. This paper are purposed a memristor emulator circuit based on operational transconductance amplifiers (OTAs). The proposed circuits can be realized using commercially integrated circuits OTA, op amp as AD844, TL084, inductor, capacitor and resistors. The characteristic of memristor emulators can be examined in a practical experiment with the active and passive components. As described, the results could be demonstrated with the memristor circuit application. Furthermore, OTA is used to realize electronically tunable current conveyors emulator circuit. As a result of simulation, the decremental and incremental memristor emulator circuit is suitable for connecting in a series circuit. It was found that the frequency-dependent pinched hysteresis loop of proposed memristor emulator circuits can be updated by changing the value of capacitance and resistance, besides it increases the current gain of current conveyor. In addition to the expected results of memristor (RM), Memcapacitor (CM) and meminductor (LM) are proposed to determine in time-domain characteristics of R-L-C mode circuits. The results of experimental are discussed of phenomena studies by the memory characteristics.
Some of the metrics are blocked by your
consent settings
Simple current-mode square-rooting circuit with temperature compensation using only OTAs
(2010-01-01)
Tangsrirat, Worapong
;
Prasertsom, Danucha
;
Pukkalanun, Tattaya
;
Surakampontorn, Wanlop
A simple current-controlled current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifi ers (OTAs) as active elements is proposed. It has been designed by using only four OTAs, without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tuning property of the OTA. Simulation and experimental results are obtained to verify the theoretical analysis of the proposed circuit technique.
Some of the metrics are blocked by your
consent settings
Temperature-insensitive current-mode square-rooting circuit using OTAs
(2008-12-01)
Prasertsom, Danucha
;
Unhavanich, Sumalee
;
Tangsrirat, Worapong
A simple current-mode square-rooting circuit with temperature compensation employing operational transconductance amplifiers (OTAs) as active elements is proposed. It has been designed by using only four OTAs without the employment of additional passive elements. The current gain of the proposed circuit can be electronically controlled, thanks to the tunability property of the OTA. Simulation results are obtained to verify the theoretical analysis of the proposed circuit technique. © 2008 SICE.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results