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CMOS-based Chebyshev current-mode ladder band-pass filter
(2015-04-24)
Tiamsuphat, Aphinat
;
Prommee, Pipat
This paper presents a CMOS-based Chebyshev current-mode ladder band-pass filter (BPF). The integrator building blocks (lossy and lossless integrators) with 6 grounded capacitors are used to realize the BPF by using doubly terminated RLC ladder filter prototype based on TSMC 0.18μm CMOS technology. Frequency response of the circuit can be tuned between 1MHz and 200MHz through bias currents from 0.01 μA to 100 μA. The proposed circuit has many attractive features, for instant, low power supply as 1.5V, low dynamic power consumption and low Total Harmonic Distortion (THD). All simulation results are carried out by PSpice which are good agreements compared with the RLC prototype.
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Log-domain all-pass filter-based multiphase sinusoidal oscillators
(2013-04-01)
Prommee, Pipat
;
Wongprommoon, Natapong
Log-domain current-mode multiphase sinusoidal oscillators based on all-pass filters are presented in this paper. The first-order differential equation is used for obtaining inverting and non-inverting all-pass filters. The proposed oscillators are realized by all-pass filters whose natural frequency and stage gain can be electronically tuned by adjusting the bias currents. Each all pass filter contains 10 NPN transistors and a grounded capacitor. The validated BJT model which is used in SPICE simulation operated by a single power supply as low as 2.5 V. The frequency of oscillation can be controlled over four decades. The total harmonic distortions of these MSO at frequency 56.67 MHz and 54.44 MHz, obtained around 0.52% and 0.75%, respectively. The proposed circuits enable fully integrated in telecommunication systems and also suit to high-frequency applications. Nonideality studies and PSpice simulation results are included to confirm the theory.
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Log-domain all-pass based multiphase sinusoidal oscillator
(2012-10-05)
Prommee, Pipat
;
Somdunyakanok, Montri
This paper describes the design of a current-mode multiphase sinusoidal oscillator (MSO) based on log-domain all-pass network. The first order all-pass filter circuit is realized by first order all-pass filter. In each block of all-pass filter includes ten bipolar transistors and a grounded capacitor. The simulation of three-phase sinusoidal signal generator is carried out by SPICE. The 2.5V power supply is used for achieving the frequency from 700Hz - 70MHz by adjusting the bias currents. For bias currents 100 μA, the frequency of the signal is obtained around 7MHz and total harmonic distortion is measured around 1.5%. The three signal outputs of the proposed MSO are equally spaced in phase and amplitude. © 2012 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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Log-domain multiphase sinusoidal oscillator
(2011-10-13)
Prommee, Pipat
;
Sra-Ium, Napat
;
Dejhan, Kobchai
This paper describes the design of a log-domain multiphase sinusoidal oscillator (MSO). The circuit is a direct realization of a first-order differential equation for obtaining the non-inverting and inverting lossy integrators. Each integrator comprises only a grounded capacitor and six transistors. The proposed MSO can be instantaneously controlled over wide frequency range by controlling the bias currents. The high-frequency of oscillation and oscillation condition can also be independently tuned which are indicated proposed MSO suitability in communications and high-frequency applications. The power consumption is obtained around 5.78mW at 100μA of bias current based on 2V single power supply. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of four-phases (11.33MHz) is obtained around 1.12%. © 2011 IEEE.
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Log-domain all-pass filter and its application to quadrature sinusoidal oscillator
(2011-10-13)
Prommee, Pipat
;
Pattanatadapong, Thanate
;
Somdunyakanok, Montri
A realization of current-mode log-domain all-pass filter is proposed. The circuit is a direct realization of a first-order differential equation for obtaining the low-pass filter. The proposed all-pass filter is realized by using log-domain low-pass filter. The log-domain all-pass filters is realized by using only 10 NPN transistors and a grounded capacitor for achieving low-power and fast response. The frequency response and stage gain can be electronically tuned through bias currents. An application of proposed log-domain all-pass filter is a quadrature sinusoidal oscillator. The proposed oscillator is obtained by cascading two all-pass filters loop. A validated BJT model which is used in SPICE simulation operated from a single power supply as low as 2V. The proposed circuit is also suitable for high-frequency applications. SPICE simulation results confirm the theoretical results. © 2011 IEEE.
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Quadrature sinusoidal oscillator based on log-domain high-pass and low-pass filters
(2011-10-13)
Prommee, Pipat
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Prapakorn, Nattawit
;
Somdunyakanok, Montri
A log-domain current-mode quadrature sinusoidal oscillator (QSO) based on low-pass (LP) and high-pass (HP) filters is presented. The log-domain QSO is realized by using only 18 NPN transistors and 2 grounded capacitors for achieving low-power and fast response. The proposed oscillator uses a cascade connecting the LP and HP which can be electronically tuned through bias current. Frequency of oscillation can be tuned over a wide-range with a low-power supply as 2V which is suitable for IC production. The power consumption is obtained around 5.5mW at 100μA of bias current. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of QSO at 10.63MHz is obtained around 1.25%. The proposed circuit is suitable for high-frequency applications. PSpice simulation confirms the theoretical results. © 2011 IEEE.
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Tunable current-mode log-domain universal filter
(2010-08-31)
Prommee, Pipat
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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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Current-mode multiphase sinusoidal oscillator based on log-domain filtering
(2010-07-30)
Prommee, Pipat
;
Somdunyakanok, Montri
This paper describes the design of a multiphase sinusoidal oscillator (MSO) based on log-domain filtering concept. The circuit is a direct realization of a first-order differential equation for obtaining the inverting lossy integrators. Each integrator comprises only a grounded capacitor and four transistors per phase. The proposed MSO can be instantaneously controlled over a very wide frequency range by controlling a current for oscillation frequency and oscillation condition which are indicated proposed MSO suitability in high-frequency communications. The power consumption is obtained around 5.5mW at 100μA of bias current based on 2.5V single power supply. The oscillation frequency is controlled over four decades of frequency. The total harmonic distortion of three-phases (11.5MHz) is obtained around 2.4%.
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Analysis of circuit operation under ZVS and NON-ZVS conditions in phase-shift inverter for induction heating
(2006-01-01)
Viriya, Pichetjamroen
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Yongyuth, Naras
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Miki, Ichiro
;
Matsuse, Kouki
This paper presents a detailed analysis of circuit operation under ZVS and NON-ZVS conditions in a full-bridge high-frequency phase-shift control series resonant MOSFET inverter with the load of induction heating. Various modes of circuit operation both under ZVS and NON-ZVS conditions are first analyzed in details. The voltage and current equations of these circuits are then obtained and used for calculation of the waveforms by MATLAB program. The calculated results can lead to the consideration of various circuit parameters that determine ZVS or NON-ZVS operating conditions. The theoretical results are also verified by experimental ones, using a prototype test set rated at 3 kW.

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