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Temperature-insensitive voltage-to-current converter and its applications
(1999-12-01)
Surakampontorn, Wanlop
A novel voltage-to-current (V/I) converter circuit is proposed, which is based on an Operational Transconductance Amplifier (OTA) integrated circuit. The V/I transconductance gain is insensitive to temperature and the input differential voltage swing limitation of the OTA integrated circuit is alleviated. New circuits for the temperature-insensitive general-grounded resistance converter, instrumentation amplifier, electronically tunable gyrator, and analog multiplier are presented. Experimental and simulation results that demonstrate the performances of the V/I and its applications are also included.
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An integrable current-mode root-n circuit
(1999-12-01)
Tangsrirat, Worapong
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Kumwatchara, Kiattisak
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Surakampontorn, Wanlop
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Riewruja, Vanchai
In this paper, a simple circuit design technique for realizing an integrable current mode nth- order rooting circuit based on a class AB configuration and a translinear loop implemented from bipolar transistors is described. The proposed circuit can provide two-quadrant nth- order rooting output signal, wide dynamic range and the circuit are readily integrable. Some PSPICE simulation results are also included demonstrating the characteristic of the proposed technique.
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OTA-based piecewise-linear circuit for nonlinear function syntheses
(1999-12-01)
Chaikla, Amphawan
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Riewruja, Vanchai
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Surakampontorn, Wanlop
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Julsereewong, Prasit
An operational transconductance amplifier (OTA) based wide-tunable-range piecewise-linear circuit, where the break-point, the limit-point and slope can be electronically varied, is proposed in this article. The proposed circuit can be employed to synthesize accurately a large class of non-linear circuit. Simulation results showing the accuracy and linearity of the circuits are also included.
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A dual translinear-based true rms-to-dc converter
(1998-12-01)
Surakampontorn, Wanlop
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Kumwachara, Kiattisak
A new design technique for a true rms-to-dc converter is implemented around a dual translinear-based squarer circuit. A dual translinear loop and current mirrors are the basic building blocks in this realization scheme, and the computation is carried in current-mode. The conversion circuit consists of a squarer, a low-pass filter and a square-root circuit. Since no rectifier function is required, this converter configuration enables us to obtain a wide-band frequency response. The input signal can be voltage or current. In addition, the modification of the converter to construct a vector summation computing circuit is also discussed. © 1998 IEEE.
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Inductance simulation using GaAs MESFETs
(1998-12-01)
Tangsrirat, Worapong
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Surakampontorn, Wanlop
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Riewruja, Vanchai
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Dumawipata, Teerasilapa
This paper proposes a method for an inductance simulation by using GaAs MESFET (Gallium Arsenide MEtal Semiconductor Field-Effect Transistor) devices. The realization method is based on the use of a GaAs voltage-to-current transducer and is also suitable for implementing in monolithic integrated circuit form. The circuit has wide bandwidth, good linearity and the simulated inductive reactance value is a linear function of resistor and capacitor. The PSPICE simulation results show that the properties of the circuit are in close agreement with the theoretical prediction.
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Low voltage bipolar translinear-based temperature dependent current source and its application
(1998-12-01)
Kumwachara, Kiattisak
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Fujii, Nobuo
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Surakampontorn, Wanlop
An integrable low voltage bipolar translinear-based temperature dependent current source is presented. The circuit operation is in the current mode, and the output current is directly proportional to temperature and can be varied by external currents. The circuit can operate with a low DC single power supply voltage of 2.0 volts. The circuit is applied to a first-order low-pass filter which is based on a bipolar current mirror. The SPICE simulation shows quite good performance of temperature compensation.
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A class AB CMOS square-rooting circuit
(1998-01-01)
Riewruja, Vanchai
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Anuntahirunrat, Kongsak
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Surakampontorn, Wanlop
An integrable CMOS square-rooting circuit based on a class AB configuration is described. The circuit achieves a wide dynamic range and a wide-band capability. The accuracy of the circuit is also high over the entire dynamic range. Simulation and experimental results demonstrating the characteristic of the proposed circuit are also included. © 1998 Taylor and Francis Group, LLC.
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CMOS-based integrable electronically tunable floating general impedance inverter
(1997-01-01)
Surakampontorn, Wanlop
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Kumwachara, Kiattisak
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Riewruja, Vanchai
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Surawatpunya, Charray
An integrable electronically tunable general impedance inverter (EGII), implemented by a MOS circuit design technique, is described. The driving point impedance of the EGII, that is inversely proportional to a given impedance, can be a positive or a negative value and can be electronically varied. The realization scheme employs proposed voltage-to-current transducers (VCTs) that are designed based on a linearizing technique, as basic circuit building blocks. The applications of the EGII as a gyrator, a general impedance converter and a floating capacitance multiplier are discussed. Experimental and simulation results that demonstrate the characteristics of the EGII are included. © 1997 Taylor and Francis Group, LLC.
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A class ab cmos tunable voltage-to-current converter
(1996-03-01)
Surakampontorn, Wanlop
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Kumwachara, Kiattisak
In this paper, a CMOS-based electronically tunable voltage-to-current (V/I) converter, which is realized using class AB amplifiers and current-squaring circuits, is proposed. The circuit provides an ability to vary its transconductance gain by electronic means with low input impedance, wide dynamic range and wide bandwidth. SPICE simulation results, which show the linearity and accuracy of the converter and the application examples of the V/I are given. © 1996 Taylor & Francis Group, LLC.
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Integrable CMOS sinusoidal frequency doubler and full-wave rectifier
(1992-01-01)
Surakampontorn, Wanlop
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Riewruja, Vanchai
A CMOS integrable circuit technique for the realization of both a sinusoidal frequency doubler and a full-wave rectifier is described in this paper. The realization method makes use of the characteristic of a simple CMOS class AB amplifier configuration. Simulation and experimental results demonstrating the circuit performance are also included. © 1992 Tayor and Francis Ltd.

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