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A four-quadrant multiplier based on CCII+s
(2010-07-30)
Narksarp, W.
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Pawarangkoon, P.
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Buakaew, S.
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Kiranon, W.
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Wardkein, P.
This paper presents an analog multiplier based on non-inverting (positive type) second generation current conveyor (CCII+). The proposed circuit can perform as a four-quadrant multiplier. The circuit employs only two positive type second generation current conveyors and two n-channel JFET transistors. The circuit does not require any external passive circuit elements. Simulation results are included to confirm the capability of the circuit with the theory. Moreover, applications of the squarer, frequency doubler and amplitude modulator are demonstrated.
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Simple and accurate frequency to voltage converter
(2010-07-30)
Lorsawatsiri, A.
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Kiranon, W.
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Silaruam, V.
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Sangpisit, W.
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Wardkein, P.
A new technique has been developed for frequency to voltage converter. This technique, based on a very simple operating principle, comprises a differentiator, two RMS-DC converters, and a divider. The proposed converter provides an accurate output and a linear transfer characteristic. Moreover, its output response has input-amplitude independent characteristic. The performance of this converter is evaluated by computer simulation. The simulation results are in good accordance with the theoretical analyses.
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A current-mode CCCII-based analog multiplier/divider
(2010-07-30)
Petchakit, W.
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Kiranon, W.
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Wardkien, P.
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Petchakit, S.
In this paper, an application of CCCII for a building block of a current-mode analog multiplier/divider is proposed. The proposed schematic is realized by employing only CCCIIs as active circuit elements and no requiring any external passive circuit elements. With a proper selection of the applied input currents, the proposed schematic can perform the functions as a four-quadrant current multiplication, a four-quadrant current division and an inverting or a non-inverting type of current amplification, without changing its topology. PSPICE simulation is used as the tool to confirm the performance of the proposed circuit.
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A four-quadrant current-mode multiplier/divider building block
(2009-10-26)
Narksarp, W.
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Pawarangkoon, P.
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Kiranon, W.
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Wadkien, P.
This paper presents a current-mode analog multiplier/divider based on current conveyors. The proposed circuit employs only two second-generation current conveyors with controlled current gains (KCCIIs). The circuit is active only; it does not require any external passive element. Then, it is suitable for implementation as integrated circuit. The proposed circuit can perform as either a four-quadrant multiplier or a four-quadrant divider without changing its topology. Simulation results of the circuit show good agreement with theoretical analysis. Applications such as modulator, full-wave rectifier and current amplifier are demonstrated to confirm the versatility of the proposed circuit. ©2009 IEEE.
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A linearized source-couple pair transconductor using a low-voltage square root circuit
(2008-10-06)
Ngamkham, W.
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Kiatwarin, N.
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Narksap, W.
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Sangpisit, W.
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Kiranon, W.
This paper presents a CMOS transconductor linearization by connecting square-rooter to a source couple pair circuit. A novel square-rooting circuit is proposed for low voltage operation. The proposed transconductance circuit is compact and consumes lower quiescent power, compared with the existing transconductors using the same realization technique. The circuit performances verification by PSPICE simulations show good results as expected. © 2008 IEEE.
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Externally linear current amplifiers
(2007-06-01)
Tongkulboriboon, S.
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Pawarangkoon, P.
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Kiranon, W.
This paper describes a method to implement externally linear internally non-linear (ELIN) current amplifiers. Two novel schemes of ELIN current amplifier circuits are proposed, including hyperbolic sine (SINH) and hyperbolic tangent (TANH) circuits. The obtained linear input-current ranges of SINH and TANH circuits are 400 Ap-p with total harmonic distortion (THD) less than 2% and 140 Ap-p with THD less than 0.2%, respectively, both at the input frequency 1 kHz. Also, the current gains of the proposed circuits can be varied either in positive or negative region by adjusting the dc bias currents. Their current gains are tunable in the range of -10 A/A to 10 A/A and insensitive to temperature. Simulation results show that the performance of the circuits are as good as expected.
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A novel noninteracting electronically tunable universal filter
(2006-12-01)
Ngamkham, W.
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Pawarangkoon, P.
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Kiranon, W.
A noninteracting electronically tunable universal filter is proposed in this paper. The proposed circuit can simultaneously realize highpass, lowpass and bandpass transfer functions without changing the circuit topology. Also, the circuit is implemented by using four CCCIIs with controlled current gain and two grounded capacitors which is suitable for IC implementation. Moreover, the proposed circuit can be simply modified to achieve bandstop and allpass responses. The parameters ω<inf>0</inf>, Q and H<inf>0</inf> of the filter are independently tunable. The PSPICE simulation results show that the proposed filter performs its function property. © 2006 IEEE.
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A low voltage four-quadrant analog multiplier using triode-MOSFETs
(2006-12-01)
Kiatwarin, N.
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Sawigun, C.
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Kiranon, W.
A low voltage four-quadrant analog multiplier circuit is presented. Based on triode region operation of MOSFET, the multiplier circuit can be simply realized by connecting a pair of PMOS with three flipped voltage follower circuits. As a result, the proposed circuit is compact and can be operated under low voltage supply. Circuit simulation using SPICE with 0.35 micron CMOS model parameter shows that under 1.5V single supply the proposed multiplier provides linear range of more than 50% of voltage supply (measured from THD less than 1%) and small signal bandwidth is higher than 95MHz while the entire circuit consumes 46.4 μW of electrical power. © 2006 IEEE.
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Electronically tunable floating resistor
(2004-11-01)
Pawarangkoon, P.
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Kiranon, W.
A new design for an electronically tunable floating resistor is proposed. The proposed circuit can be realized as a positive or negative resistor without changing the circuit topology, and can be tuned electronically. Simulation results are obtained to show adequate agreement with theory.
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Multiphase sinusoidal oscillators using translinear current conveyors and only grounded passive components
(2001-01-01)
Loescharataramdee, C.
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Kiranon, W.
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Sangpisit, W.
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Yadum, W.
A generalized multiphase sinusoidal oscillator is presented. The circuit realization uses the translinear bipolar second generation current-controlled conveyors to generate arbitrary n current signals equally spaced in phase. The proposed circuit consists of n multi-output current controlled conveyors and a current amplifier connected in cascade. The only passive component employed in each of the n conveyors is one grounded capacitor. The oscillation condition and oscillation frequency are independently controlled. The former depends only on the number of the phase signals of the oscillator. The dependency of the latter on the input resistance of the input ports of the current conveyors makes electronic tunability possible using the bias currents. The circuit also enjoys having simple structure and very low component count and it is highly suitable for monolithic implementation.

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