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Integrable Electronically Tunable Current Conveyors
(1988-01-01)
Surakampontorn, W.
;
Thitimajshima, P.
A generalised current conveyor, termed an electronically tunable second-generation current conveyor (ECCII), whose current-transfer ratio can be varied by electronic means, is introduced. A method is proposed for realising ECCII in monolithic integrated form providing both a positive and a negative ECCII in the same circuit. Experimental and simulation results demonstrating the circuit performance are included. Some simple applications which show that their circuit property can be varied by electronic means are also presented. © 1988, The Institution of Electrical Engineers. All rights reserved.
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Full-wave rectifiers using operational amplifiers and resistors
(1989-01-01)
Surakampontorn, W.
;
Jutaviriya, S.
;
Apajinda, T.
An alternative scheme for realizing a Full-wave rectifier is described in this note. The realization method uses the inherited class AB complementary stage of a general-purpose operational amplifier (op amp) as a means to perform a rectifier action. Therefore, the rectifier circuits comprise only op amps and resistors. © 1989 Taylor & Francis Ltd.
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Dual translinear sinusoidal frequency doubler and full-wave rectifier
(1988-01-01)
Surakampontorn, W.
;
Jutaviriya, S.
;
Apajinda, T.
In this article, an integrable circuit principle which can be employed to realize both a sinusoidal frequency doubler and a full-wave rectifier is presented. The realization method makes use of a dual translinear characteristic of bipolar junction transistors. Two implementation circuits are proposed and their performance are demonstrated by experimental results. © 1988 Taylor & Francis Group, LLC.
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Electronically variable general-resistance circuit
(1986-01-01)
Surakampontorn, W.
;
Junnapiya, S.
A general-resistance conversion circuit that can transform a given resistance into a positive and a negative resistance is proposed. The converted resistance is floating and its magnitude can be varied by electronic means. The circuit can be used in both a voltage-controlled mode and a current-controlled mode. Since the lateral pnp transistors are not placed in the signal paths, the circuit has a wide bandwidth. © 1986 Taylor & Francis Group, LLC.
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p-adic transforms
(1984-08-30)
Laohakosol, V.
;
Surakampontorn, W.
Two clarifications are made on the uniqueness of representation of rational numbers in a finite segmented p-adic field, and on orthogonality asserted in a recent article on p-adic transforms. One clarification also reveals a slight generalisation on dynamic range. In addition, an extension of this transform to finite-dimensional cases is also given. © 1984, The Institution of Electrical Engineers. All rights reserved.
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Integrable wide-dynamic-range negative resistance circuits
(1985-05-23)
Surakampontorn, W.
A technique for realising grounded and floating negative resistances in monolithic integrated form is described. The conversion circuit will linearly and accurately convert a given resistance to a corresponding negative resistance with exactly the same magnitude. The dynamic range of the converted resistance is approximately | V<inf>cc</inf> — 3V<inf>BE</inf>|. © 1985, The Institution of Electrical Engineers. All rights reserved.
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Noise-reduction method for ROM/ACC filters
(1984-10-11)
Surakampontorn, W.
A noise-reduction method for the coefficient roundoff noise in a ROM/ACC filter is proposed and demonstrated. The method of realisation is a modification of the contents of the look-up table of the ROM to include the error feedback. Therefore, it does not need time-consuming procedures, and is suitable for a filter implemented by using a microprocessor. © 1984, The Institution of Electrical Engineers. All rights reserved.
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An Integrable Precision Voltage-to-Current Converter with Bilateral Capability
(1978-01-01)
Pookaiyaudom, S.
;
Surakampontorn, W.
A simple, integrable, unilateral or bilateral voltage-to-current converter is presented. Very linear and accurate conversions have been measured for voltage ranging from 0 to more than 10 V. The signal paths do not include any lateral p-n-p transistors, offering potentially wide-band applications. © 1978, IEEE. All rights reserved.
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An Integrable Precision Current-Controlled Negative Impedance Converter
(1978-01-01)
Pookaiyaudom, S.
;
Surakampontorn, W.
An easily integrable precision floating current-controlled negative impedance converter is proposed and experimentally demonstrated. The resulting converted negative impedance magnitude is both highly accurate and linear over the entire dynamic range. Either terminal voltage can be referenced. The circuit is stable for capacitive impedance conversions. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.

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