KMITL

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

Browse

Search Results

Now showing 1 - 10 of 10

Some of the metrics are blocked by your
consent settings
Low-voltage all-nmos four-quadrant current multiplier
(2018-04-01)
Pukkalanun, Tattaya
;
Tangsrirat, Worapong
This paper presents a low-voltage four-quadrant current-mode multiplier circuit using all-NMOS technique. The circuit is constructed using current-squaring function circuits and simple current mirrors, where all small-signal currents pass through only NMOS transistors. The proposed current multiplier is simple and suitable for low-voltage, low-power operation. The circuit performances were demonstrated by PSPICE simulations with TSMC 0.35-μm CMOS process. To show the basic function of the proposed circuit, the frequency doubling and amplitude modulating circuits have been performed and simulated.
Some of the metrics are blocked by your
consent settings
Single CCCTA-based sinusoidal oscillator with voltage and current outputs
(2014-01-01)
Channumsin, Orapin
;
Tangsrirat, Worapong
The sinusoidal oscillator which produces both voltage and current outputs simultaneously is described in this study. The described oscillator circuit contains only one current-controlled conveyor transconductance amplifier (CCCTA) and three grounded passive components. The circuit provides advantage features, such as, use of all grounded passive components, electronic tuning of oscillation condition and frequency and low sensitivity figures. Circuit performance verification is verified by PSPICE program with attractive results.
Some of the metrics are blocked by your
consent settings
Current limiters using single current follower and applications to precision rectifiers
(2011-04-01)
Tangsrirat, Worapong
A synthesis of current limiters (CLs) using single current follower (CF) is described. The breakpoint of the resulting transfer characteristic obtained from the proposed CF-based CLs is electronically adjustable through an external control current. To demonstrate feasibility of the proposed CL circuits, some non-linear applications to programmable current-mode precision full-wave rectifiers are also presented. PSPICE simulation and experimental results are included to support the theoretical claims.
Some of the metrics are blocked by your
consent settings
Simple current-mode analog multiplier, divider, square-rooter and squarer based on CDTAs
(2011-03-01)
Tangsrirat, Worapong
;
Pukkalanun, Tattaya
;
Mongkolwai, Pratya
;
Surakampontorn, Wanlop
In this paper, the design of simple analog current-mode multiplier, divider, square-rooter and squarer circuits using only two current differencing transconductance amplifiers (CDTAs) is proposed. With the selection of the applied input currents, the proposed circuit can perform four-quadrant current multiplication, division and current-controlled current amplification, without changing its configuration. Moreover, the current-mode square-rooter and squarer circuits can easily be obtained with the possibility of electronically transfer gain adjustment by slight modification of the proposed configuration. All the proposed circuits are insensitive to ambient temperature variations. Additionally, the CDTA non-ideality effects on the proposed circuits are also investigated and discussed. The performances of the realized circuits are examined by PSPICE simulations. © 2010 Elsevier GmbH. All rights reserved.
Some of the metrics are blocked by your
consent settings
Resistorless realization of current-mode first-order allpass filter using current differencing transconductance amplifiers
(2010-02-01)
Tangsrirat, Worapong
;
Pukkalanun, Tattaya
;
Surakampontorn, Wanlop
This paper presents a realization of a current-mode first-order allpass filter using two current differencing transconductance amplifiers (CDTAs) as the active components and one virtually grounded capacitor as the only passive component. The proposed filer requires no external resistor and is electronically adjustable by varying the external bias current of the CDTA. No component-matching constraints are required. The circuit realizes both inverting and non-inverting types of allpass filters, and also exhibits high-output impedances, which are easy cascading in the current-mode operation. As an application of the proposed CDTA-based allpass section, a current-mode quadrature oscillator is realized. PSPICE simulation results are given to confirm the theoretical analysis. © 2010 Elsevier Ltd. All rights reserved.
Some of the metrics are blocked by your
consent settings
CMOS digitally controlled current follower and its application
(2009-12-01)
Prasertsom, Danucha
;
Tangsrirat, Worapong
A realization of the CMOS digitally controlled current follower (DC-CF) suitable for low-voltage high-frequency application is proposed. To achieve very low input resistance, it is realized using a modification of a low-input resistance stage as an input stage. To achieve the precise digital control of the current gain, the current division technique is used. The proposed DC-CF can operate with low voltage supplies of ±1.5 V, and is designed with 0.5- μm CMOS SCN05H process. As an application, the digitally programmable current-mode universal filter using the proposed DC-CF is given. Simulation results are also included.
Some of the metrics are blocked by your
consent settings
Current-mode multiphase sinusoidal oscillator using CDTA-based allpass sections
(2009-07-01)
Tangsrirat, Worapong
;
Tanjaroen, Wason
;
Pukkalanun, Tattaya
In this work, a current tunable current-mode multiphase sinusoidal oscillator (MSO) employing current differencing transconductance amplifier (CDTA)-based first-order allpass sections is presented. The proposed MSO circuit, which uses only two CDTAs and one virtually grounded capacitor for each phase, can generate arbitrary 2 n-phase current-output signals (n = 2, 3, 4, ...) equally spaced in phase, all at high output impedance terminals. The oscillation condition and the oscillation frequency can be controlled electronically and independently by adjusting the bias current of the CDTA. The oscillator has low-sensitivity performance. Simulation results are also given to verify the functionality of the proposed oscillator. © 2008 Elsevier GmbH. All rights reserved.
Some of the metrics are blocked by your
consent settings
Multiple-input single-output current-mode multifunction filter using current differencing transconductance amplifiers
(2007-04-02)
Tangsrirat, Worapong
;
Dumawipata, Teerasilapa
;
Surakampontorn, Wanlop
A novel current-controlled multiple-input single-output current-mode universal filter employing current differencing transconductance amplifiers (CDTAs) as active elements is described. The proposed circuit offers the following attractive features: employment of the minimum number of active and passive components; simultaneous realization of all the standard filtering functions; independent current-control of the parameters ω<inf>o</inf> and ω<inf>o</inf> / Q; no requirement of component matching conditions; employment of only two grounded passive capacitors which is suitable for integrated circuit (IC) implementation; and low passive and active sensitivities. PSPICE simulation results are given to verify the theoretical analysis. An example application using the proposed circuit in cascade realization of the high-order current-mode filter is also presented. © 2006 Elsevier GmbH. All rights reserved.
Some of the metrics are blocked by your
consent settings
High output impedance current-mode universal filter employing dual-output current-controlled conveyors and grounded capacitors
(2007-02-01)
Tangsrirat, Worapong
;
Surakampontorn, Wanlop
A novel current-controlled two-input three-output current-mode universal filter, which employs only three dual-output controlled-controlled current conveyors (DOCCCIIs) and two grounded capacitors, is presented in this paper. The proposed configuration provides inverting-type lowpass, noninverting-type lowpass, inverting-type bandpass, noninverting-type bandpass, highpass, bandstop and allpass current responses at a high impedance terminal, which enable easy cascadability. The filter also offers an independent electronic control of the natural frequency ω<inf>o</inf> and the parameter ω<inf>o</inf> / Q through adjusting the bias current of the DOCCCII. No critical matching condition is required for realizing all the filter responses, and all the incremental parameter sensitivities are low. The performances of the proposed circuit are simulated with PSPICE to confirm the presented theory. © 2006 Elsevier GmbH. All rights reserved.
Some of the metrics are blocked by your
consent settings
FTFN with variable current gain
(2001-12-01)
Tangsrirat, Worapong
;
Unhavanich, Sumalee
;
Dumawipata, Teerasilapa
;
Surakampontorn, Wanlop
This paper proposes a circuit configuration for the realization of a four-terminal floating nullor (FTFN) with electronically tunable current gain. It mainly consists of an op amp in input together with two complementary current mirrors with controlled gain and two standard improved Wilson current mirrors. The validity of the performance of the scheme is verified through PSPICE simulation results. Some example applications in the design of the proposed tunable FTFN as a tunable active element show that the circuit properties can be varied by electronic means are also included.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results