Prommee, Pipat

Preferred name

Prommee, Pipat

Alternative Name

Prommee, P.

Main Affiliation

School of Engineering

pipat.pr@kmitl.ac.th

Now showing 1 - 10 of 61

Some of the metrics are blocked by your
consent settings
Grounded Capacitive Sensor Readout Using Improved Guard Driving Circuit
(2025-01-01)
Chimnoy, Jirat
;
Karawanich, Khunanon
;
Prommee, Pipat
A remote capacitive sensor is necessary in hazardous locations such as liquid boilers and chemical facilities. The connection of the capacitive sensor and coaxial cable is integrated with the readout circuit, encompassing intrinsic noise and parasitic capacitance limitations. This work presents a grounded capacitive sensor with an economical architecture incorporating an RC lowpass filter and an enhanced guard driving circuit. The proposed technique effectively achieves minimal parasitic capacitance and reduced noise at the output. The sensor capacitance can be readily calculated by measuring the output signal's amplitude at the cutoff frequency. Both simulation and experimental findings corroborate its efficacy and precision. The capacitance range can be quantified between 1-100 pF with less than 2% relative errors.
Some of the metrics are blocked by your
consent settings
Tunable current-mode log-domain universal filter
(2010-08-31)
Prommee, Pipat
;
Somdunyakanok, Montri
;
Angkeaw, Krit
;
Dejhan, Kobchai
This paper describes the design of a current-mode universal filter based on log-domain filtering concept. The circuit is a direct realization of a first-order differential equation for obtaining the two integrators loop structure. Lossless integrators are realized by log-domain lossy integrators. The proposed filter comprises only two grounded capacitors and sixteen transistors. Frequency response of the proposed filter can be instantaneously controlled over a very wide frequency range by controlling current. Quality factor is independently controlled by another current. It can be seen that the proposed circuit suites for high-frequency applications. A validated BJT model that used in simulation is operated by a single power supply as low as 2.5V. The wide-range frequency response is controlled over five decades of current controlled. ©2010 IEEE.
Some of the metrics are blocked by your
consent settings
Log-domain current-mode third-order sinusoidal oscillator
(2011-10-13)
Prommee, Pipat
;
Angkeaw, Krit
This paper describes the design of the third-order sinusoidal oscillator based on log-domain filtering concept. The circuit consists of two inverting lossy integrators and one inverting lossless integrator. The circuit employs only NPN-transistors. This proposed circuit can be instantaneously controlled over a very wide frequency range by adjusting bias currents for oscillation frequency which are indicated proposed circuit suitability in high-frequency applications. The oscillation condition and frequency of oscillation can be tuned by bias current. Sinusoidal frequency output can be obtained up to 100MHz with low THD and low number of transistors. Characteristics of this circuit are simulated using PSpice and they are found in agreement with the theory. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
Simple structure OTA-C elliptic band-pass filter
(2019-07-01)
Prommee, Pipat
;
Wongprommoon, Natapong
;
Khateb, Fabian
;
Manositthichai, Narongsak
This paper presents a new Elliptic ladder bandpass (BP) filter based on MO-OTA. This RLC ladder low-pass (LP) prototype and network transformation are used to create the band-pass signal flow graph (SFG). From SFG, the integrators and differentiator are required to realize the BP Elliptic filter with low-complexity configuration. The integrator and differentiator circuits can generally be obtained based on OTA-C technique. Lossy and lossless integrators and differentiators based on MO-OTA(s) are straight-forward applied to SFG for achieving the designed filter. Based on this technique, the circuit is obviously apparent that the final circuit has low-complexity and low-component count compared with the conventional technique. This proposed BP Elliptic filter contains only 10 bipolar MO-OTAs and 8 grounded capacitors. The frequency responses can be tuned between 2kHz and 100kHz through the bias currents of OTA. The simulation results are carried out by PSpice and agreed well with theory anticipation.
Some of the metrics are blocked by your
consent settings
Fully tunable all-pass filter using OTA and its application
(2016-11-28)
Saising, Ekkapong
;
Prommee, Pipat
This paper proposes a realization of fully tunable all-pass (AP) filter and its application. Three Multiple Outputs Operational Transconductance Amplifiers (MOOTAs) and a grounded capacitor are used for realizing an all-pass filter which is able to tune in both of the frequency response and gain. The frequency response and gain are independently tuned through particular bias current. The advantage of independent tunable gain is of AP filter that can be widely used in many applications as well as the sinusoidal oscillator. A multiphase sinusoidal oscillator (MSO) using loop-back of three cascaded all-pass sections is raised as an application. Three MOOTAs and a grounded capacitor are constructed as current-mode APN. The PSpice simulations results are described in two parts, AP filter and MSO. It shows the magnitude and phase responses can be independently tuned. The MSO current and voltage outputs are equally spaced in phase of 360/n degree. The harmonic distortion of the sinusoidal output is less than 0.64%.
Some of the metrics are blocked by your
consent settings
A current-mode quadrature oscillator based on CC-CFAs
(2009-10-26)
Kumbun, Jongjarean
;
Silapan, Phamorn
;
Siripruchyanun, Montree
;
Prommee, Pipat
This article presents a current-mode quadrature oscillator using current controlled current feedback amplifiers (CC-CFAs) as active elements. The proposed circuit is realized from a lossy integrator and a lossy differentiator. The oscillation condition and oscillation frequency can be orthogonally controlled via input bias currents. The circuit description is very simple, consisting of merely 2 CC-CFAs, one grounded and floating capacitors. Without any external resistors and using a few number of external passive components, the proposed circuit is then suitable for IC architecture. The proposed circuit, due to high output impedances, enabling easy cascading in current-mode signal processing. The PSPICE simulation results are depicted, and the given results agree well with the theoretical anticipation. The power consumption is approximately 327μW at ±1.5V supply voltages. ©2009 IEEE.
Some of the metrics are blocked by your
consent settings
A versatile vector summation circuit
(2006-12-01)
Netbut, Chuachai
;
Kumngern, Montree
;
Prommee, Pipat
;
Dejhan, Kobchai
A versatile vector summation circuit is presented. It is based on CMOS dual translinear loops as operate in class AB and current mirrors, which leads to the input signal can be voltage and/or current into a single circuit without changing the circuit configuration. The circuit exhibits wide input range, low power consumption and good temperature stability. Simulation and experimental results verifying theoretical analyses are given. © 2006 IEEE.
Some of the metrics are blocked by your
consent settings
Realization of OTA-C current-mode universal filter based on two type integrators loop
(2007-12-01)
Prommee, Pipat
;
Somdunyakanok, Montri
;
Angkeaw, Krit
;
Dejhan, Kobchai
A universal current-mode active filter based on 2 types of integrator, lossy and lossless integrators, is presented. The biquadratic transfer function is obtained by the two integrators loop. The proposed circuit employs only 2 multiple output OTAs (MO-OTA) and 3 capacitors. The parameter Q<inf>P</inf> can be wide-range tuned independent from the ω<inf>P</inf> either changing of capacitor and transconductance gains. Moreover, the four different kind filter functions as lowpass, highpass, bandpass and band-reject response can be also obtained without changing circuit topology. The parameters ω<inf>p</inf> can be electronically tuned through adjusting the transconductance gains of the OTAs. The simulation results have been carried out by PSpice. © 2007 IEEE.
Some of the metrics are blocked by your
consent settings
Log-domain quadrature sinusoidal oscillator based on lossless integrator and all-pass filter
(2011-12-01)
Prommee, Pipat
;
Somdunyakanok, Montri
;
Angkeaw, Krit
A log-domain current-mode quadrature sinusoidal oscillator based on all-pass filter and lossless integrator is presented. The oscillator is realized by a first-order differential equation for obtaining all pass filter and lossless integrator. The proposed oscillator can be electronically tuned by adjusting bias currents. The proposed oscillator contains 18 NPN transistors, 2 grounded capacitors and 11 bias currents for achieving low-power and fast response. A validated BJT model is used in SPICE simulation operated from a single power supply as low as 2.5V. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of signal output is obtained around 0.55%. The oscillation frequency can be operated more than 100MHz which enables fully integrated in telecommunication systems and suitable for high-frequency applications. SPICE simulation results are included. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
Universal filter and its oscillator modification employing only active components
(2009-01-01)
Prommee, Pipat
;
Somdunyakanok, Montri
;
Dejhan, Kobchai
An active-only devices current-mode universal fIlter using the biquadratic transfer function is proposed. The proposed circuit is realized based on minimized active-only components count without external passive elements. The electronic resistors are used instead of 2 OTAs. The different kinds of fIlter function such as lowpass, highpass, bandpass and band-reject response can be obtained without changing circuit topology. A quadrature oscillator can also be easily modifIed without changing circuit topology. The proposed circuit is realized by using 4 MOS transistors, 3 OTAs, and 2 Opamps. The parameters ~ and Qp can be electronically tuned independently through adjusting the transconductance gains of the OTAs. The simulation results are given by PSpic.

Prommee, Pipat

Filters

Settings

Sort By

Results per page