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 49

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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.
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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.
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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.
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Two digitally programmable gain amplifiers based on current conveyors
(2011-05-01)
Angkeaw, Krit
;
Prommee, Pipat
Two digitally programmable gain amplifiers based on current conveyors (CCIIs) are presented. The first digitally programmable gain amplifier consists of a CCII, an operational transconductance amplifier (OTA), and current mirrors. The second one is composed of current conveyor analogue switches (CCASs). Both proposed digitally programmable gain amplifiers do not need switches but they maintain the linear gain at any digital signal levels similar to the digitally programmable gain amplifier using switches; hence the proposed amplifiers are easier to realize, use narrower chip area, and consume lower power. The first proposed amplifier is verified by constructing the circuit using the CCII in an AD844 IC, the OTA in a CA3080 IC, and some bipolar current mirrors. The second proposed amplifier is verified by simulating the circuit using the parameters extracted from the layout (including parasitic capacitance) in the 0.25 μm MOS technology, the level 49 MOS model obtained through MOSIS is used. The results show that the operations of two proposed amplifiers are in accordance with the theories. © Springer Science+Business Media, LLC 2010.
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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%.
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Electronically tunable current-mode high-order ladder low-pass filters based on CMOS technology
(2015-01-01)
Kunto, Terdsak
;
Prommee, Pipat
;
Abuelma'atti, Muhammad Taher
This paper describes the design of current mode low-pass ladder filters based on CMOS technology. The filters are derived from passive RLC ladder filter prototypes using new CMOS lossy and lossless integrators. The all-pole and Elliptic approximations are used in the proposed low-pass filter realizations. The proposed two types of filter can be electronically tuned between 10 kHz and 100 MHz through bias current from 0.03 μA to 300 μA. The proposed filters use 1.5 V power supply with 3 mW power consumption at 300 μA bias current. The proposed filters are resistorless, use grounded capacitors and are suitable for further integration. The total harmonic distortion (THD) of the low-pass filters is less than 1% over the operating frequency range. PSPICE simulation results, obtained by using TSMC 0.18μm technology, confirm the presented theory.
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Electronically tunable MOS-only current-mode high-order band-pass filters
(2017-01-01)
Prommee, Pipat
;
Tiamsuphat, Aphinat
;
Taher Abuelma'Atti, Muhammad
This paper presents new CMOS current-mode ladder Chebyshev and elliptic band-pass filters (BPFs). The signal flow graph and the network transformation methods are used to synthesize the proposed BPFs by using Chebyshev and elliptic RLC low-pass prototypes. CMOS-based lossy and lossless integrators with grounded capacitors are used to synthesize the proposed BPFs. The proposed filters can be electronically tuned between 10 kHz and 100 MHz by adjusting the bias current from 0.02 A to 200 A. Both filters use a 1.5 V DC power supply, which leads to low dynamic power consumption. Both filters enjoy total harmonic distortion of less than 1.5% along the range of the tuning bias currents. Simulation results are included to illustrate the functionality of the proposed filters.
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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.
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Log-domain current-mode quadrature sinusoidal oscillator
(2011-12-14)
Prommee, Pipat
;
Prapakorn, Nattawit
;
Swamy, M. N.S.
A log-domain current-mode quadrature sinusoidal oscillator based on lossless integrators is presented. The circuit is a direct realization of a first-order differential equation for obtaining the lossy and lossless integrators. Each of the log-domain lossless integrators is realized by using only NPN transistors and a grounded capacitor for achieving low-power and fast response. The proposed oscillator uses two-lossless integrator loop which can be electronically tuned through bias currents. A validated BJT model which is used in SPICE simulation operated from a single power supply as low as 2.5 V. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortions for two-phases QSO (12 MHz) is obtained around 0.93% which enables fully integrated in telecommunication systems. The proposed circuit is also suitable for high-frequency applications. Nonideality studies are included and PSpice simulation results confirm the theoretical results.
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CMOS-based current-controlled DDCC and its applications
(2010-08-31)
Prommee, Pipat
;
Somdunyakanok, Montri
;
Toomsawasdi, Sompongse
This paper presents design of an active building block for analog signal processing, named as current-controlled differential difference current conveyor (CCDDCC). Its parasitic resistances at X-terminal can be controlled by an input bias current. The proposed element is realized in a CMOS technology. It displays usability of the new active element, where the maximum bandwidth of voltage and current followers are around 1GHz, 100MHz, respectively. The THD is obtained around 0.8% within 0.6Vpp input range. The power dissipation of a CCDDCC at 10μA biased current is obtained around 1.35mW with ±1.25V power supplies. In addition, current-mode multiple-input single output (MISO) second-order universal analog filter is included as the applications. The filter offers the realization of simultaneous five type standard filter responses. The quality factor and the frequency response parameters can be independently tuned. SPICE simulation results of proposed CCDDCC and its applications are also presented. ©2010 IEEE.

Prommee, Pipat

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