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 14

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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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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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Realization of OTA-C current-mode universal filter based on two type integrators loop
(2007-12-01)
Prommee, Pipat
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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.
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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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Tunable PID controller based on log-domain circuits
(2015-10-09)
Angkeaw, Krit
;
Prommee, Tanakrit
;
Prommee, Pipat
Current-mode proportional plus integral plus derivative (PID) controller based on log-domain concept is presented in this paper. The parameters of P, I, and D blocks can be independently controlled through bias currents. Only grounded capacitors are employed as a passive element for achieving the time-constant of I and D controllers. In each block of I and D controllers are easily constructed by using 10 bipolar transistors and a grounded capacitor except P controller uses only 4 bipolar transistors without any resistors. Thus, it is suitable for integrated circuits realization. Single power supply voltage 2.5V is used. The characteristics of PID are simulated is by SPICE. The demonstrated results are in good agreement with the theoretical expectations.
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CCCII-based multiphase sinusoidal oscillator employing high-pass sections
(2009-10-22)
Prommee, Pipat
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Somdunyakanok, Montri
;
Angkeaw, Krit
This paper proposes a new approach to implement a multiphase sinusoidal oscillator by using loop-back of n-cascaded high-pass sections form. Two CMOS Current-controlled Current Conveyors (CCCII) and a grounded capacitor are constructed as a current-mode high-pass section for each phase. The orthogonally of oscillate condition and frequency of oscillation are obtained with their electronically controllable through current biased of CCCII. Multiphase sinusoidal outputs can be obtained with equally spaced in phase, 360/n degree. Third-order oscillator is raised up to confirm the theoretical agreement. Low-harmonic distortion of achieved sinusoidal output obtains less than 0.9%. The performances are carried out by PSpice for confirm its characteristics. ©2009 IEEE.
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Log-domain high-order low-pass and band-pass filters
(2017-09-01)
Prommee, Pipat
;
Thongdit, Preecha
;
Angkeaw, Krit
Continuous time current-mode high-order low-pass and band-pass filters based on the log-domain concept are presented in this paper. The passive RLC ladder networks are used as the prototype to achieve the proposed filter by simulating the RLC network synthesis method. The achieved filters have inherited the good sensitivity performance from the RLC passive prototype. Fifth-order RLC ladder low-pass filter and sixth-order RLC ladder band-pass filter are used as prototypes and the signal flow graph (SFG) technique is used for the synthesis. The SFG can identify group of integrators and several signal paths. Log-domain lossy and lossless integrators based on BJT technology are deployed to achieve the integrators for realization of proposed filters. The simulations were carried out and the results exhibited several features which are in agreement with the RLC prototype. The frequency response of filters along 100 kHz to 10 MHz can be electronically tuned through 5–500 µA of bias currents. The THD lower than 1% of LP and BP filters were measured at 10 MHz input. The multi-tone tested was included in the paper for verifying the performance of proposed LP and BP filters. The intermodulation distortions around −50 dB and −60 dB were also investigated for the proposed LP and BP filters.
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Design and implementation of FPAA based LQR controller for magnetic levitation control system
(2019-07-01)
Angkeaw, Krit
;
Pongyart, Witthawas
;
Prommee, Pipat
Analog circuits were once necessary in many fields of technology, including control systems. Analog circuits were used to build many types of controller, but in controller design, synthesis of analog circuits were difficult. Because of its difficulty, most analog controllers have been replaced by digital controllers. Currently, the field programmable analog arrays (FPAA) which is a high level analog circuit, switched capacitor are widely used. Effective controller design and synthesis of analog circuits can be achieved easily using the FPAA. Therefore, the FPAA is applied to this project to design and synthesize an enhanced controller. An optimal controller, LQR as an example requires precise controller gain to obtain the highest performance which cannot be obtained using normal analog circuits. Moreover, using the FPAA can overcome performance degradation due to discretization in the synthesis of digital controllers. The simulation results confirm the advantages of a FPAA controller.
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Floating-capacitance multiplier based on CCDDCCs and its application
(2011-12-01)
Somdunyakanok, Montri
;
Angkeaw, Krit
;
Prommee, Pipat
This paper proposes a new floating capacitance multiplier using three Current Control Differential Difference Current Conveyors (CCDDCCs) with CMOS technology and one grounded capacitor. The circuit can be electronically tuned through bias currents of CCDDCC without external resistor connections and temperature effects do not affected to the capacitance characteristic. The realization is suitable for further integration. The third-order elliptic LPF is included as an application. The simulations results of proposed capacitance multiplier and its applications are carried out by PSpice that agrees well with the theoretical expectations. © 2011 IEEE.

Prommee, Pipat

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