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Design of MURROMAF filters with equiripple stopband attenuation
(1989-01-01)
Thajchayapong, P.
;
Rungsunseri, Y.
;
Punkasirikul, C.
A class of filters known as multiple real-pole equal-ripple rational (MRPER) filters has already been proposed. It provides the advantages of third-order block realization or the Cauer type of filter. A design technique is proposed here for a multiple real-root maximally flat (MURROMAF) filter with equiripple stopband. Hence, the filter designer is now provided with a third-order block realization of the inverse Chebyshev type of filter. © 1989 Taylor & Francis Ltd.
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Segmented thai numeric display
(1989-01-01)
Surakampontorn, Wanlop
;
Jutaviriya, Supakit
;
Riewruja, Vanchai
The layouts for eight-and nine-segment Thai numeric displays have been presented in this paper. The design of a BCD-to-nine Thai numeric decoder has also been designed. © 1989 IEEE
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Sinusoidal Frequency Doublers Using Operational Amplifiers
(1988-01-01)
Surakampontorn, Wanlop
This paper proposes a simple sinusoidal frequency-doubling circuit employing operational amplifiers (op amps) with resistors as the only external components. The realization method makes use of the inherent translinear loop at the output stage of the op amp as a means to perform frequency doubling. The response of the circuit is discussed and experimentally demonstrated. © 1988 IEEE
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Transitional multiple-real-pole/multiple-critical-pole transfer functions for lowpass RC-active filter design
(1988-01-01)
Thajchayapong, P.
;
Buabthong, N.
A new class of all-pole multiple-real-pole/multiple-critical-pole transfer functions is described. The function characteristics lie between the maximally flat type and the equiripple type. Hence, they provide a lowpass RC -active filter designer with the freedom to trade between the selectivity of the filter response and the filter sensitivity. © 1988, Taylor & Francis Group, LLC.
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Microstrip waveguide gunn oscillator
(1989-01-01)
Surawatpunya, Charray
;
Saetang, Khanittha
A microstrip waveguide Gunn oscillator is proposed. The oscillator utilizes frequency-selective feedback from the periodic structures created in the microstrip waveguide to the Gunn diode to achieve stable oscillation. An oscillator design by means of an equivalent-circuit model is described. The observed oscillation characteristics of an X-band microstrip waveguide Gunn oscillator are reported. © 1989 Taylor & Francis Ltd.
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8 bit presettable/programmable synchronous counter/divider
(1989-12-01)
Choomchuay, Somsak
;
Supadech, Somkiat
;
Sangworasilp, Manus
The authors describe the design and implementation of an ASIC (application-specific integrated circuit) chip. The design is a J-K flip-flop-based counter. With appropriate control circuitry, this chip can function as a multimode counter/divider subsystem. The device was fabricated using a 5-μm p-well polysilicon-gate CMOS process. It is noted that, due to its versatility, this ASIC has many potential applications.
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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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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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OTA-based electronically tunable voltage-controlled resistance converter
(1989-01-01)
Surakampontorn, Wanlop
;
Jutaviriya, Supakit
;
Riewruja, Vanchai
An operational transconductance amplifier (OTA) based wide-tunable-range voltage-controlled resistance converter circuit, where the magnitude of the converted resistance can be electronically varied, is proposed in this paper. The circuit is realized through the use of an active network, termed an ‘electronically tunable second-generation current conveyor’ (ECCII), which is a current conveyor with electronically variable properties. The realization scheme provides both a positive and a negative resistance and employs OTAs as the only active elements. © 1989 Taylor & Francis Ltd.
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Simulations for the transient properties of multi-mode delay-line controlled oscillators
(1989-01-01)
Pookaiyaudom, Sitthichai
;
Jantarang, Sujate
This paper describes a discrete time domain numerical simulation method for multi-mode delay-line controlled oscillators, which can yield solutions to both transitent and steady state properties. A new efTicient algorithm for numerical simulations of non-dispersive dealy-lines is given. Experimental results supporting the validity of the theory are also presented. © 1989 Taylor & Francis Group, LLC.

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