Current‐input OTRA Schmitt trigger with dual hysteresis modes

Lo, Yu‐Kang; Chien, Heng-Chieh; Chiu, Huang‐Jen

doi:10.1002/cta.584

Cited by 38 publications

(22 citation statements)

References 42 publications

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“…For the results as shown in Figs. 33 and 34, they are the square and triangular-waves when I B2 and I B3 = 20, 60 and 100 lA, respectively, it can be found that the output amplitudes of square and triangular-wave can be respectively tuned by I B2 and I B5 without affecting the frequency deviation, as analyzed in (30), (31) and (33). The last result is shown in Fig.…”

Section: Current-mode Triangular/square-wave Generatormentioning

confidence: 73%

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Fully and electronically controllable current-mode Schmitt triggers employing only single MO-CCCDTA and their applications

Silapan

Siripruchyanun

2011

Analog Integr Circ Sig Process

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This article presents the new current-mode counterclockwise (CCW) and clockwise (CW) Schmitt triggers based on multiple-output current controlled current differencing transconductance amplifier (MO-CCCDTA). The circuit descriptions are very simple, each construction consists of only single MO-CCCDTA, without any external passive element. The hysteresis and amplitude of the output current of each Schmitt trigger can be tuned independently/ electronically by input bias currents. In addition, the output signals are independent of the thermal voltage (V T ). The applications as a relaxation oscillator, triangular/square wave generator, pulse width modulation and monostable multivibrator are given here to display the usefulnesses of the presented Schmitt triggers. The PSpice simulation and experimental results are depicted, and agree well with the theoretical anticipation. The maximum power consumptions of CCW and CW Schmitt triggers are approximately 235 and 191 lW, respectively, at ±1.5 V supply voltages.

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Section: Current-mode Triangular/square-wave Generatormentioning

confidence: 73%

“…In 2008, the current-input Schmitt trigger based on OTRA [31] has been reported. It can operate as CCW and CW Schmitt triggers in the same topology.…”

Section: Introductionmentioning

confidence: 99%

Fully and electronically controllable current-mode Schmitt triggers employing only single MO-CCCDTA and their applications

Silapan

Siripruchyanun

2011

Analog Integr Circ Sig Process

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“…It was first reported by Schmitt in 1938 [1]. A number of Schmitt trigger topologies based on various active elements such as operational amplifier (OP-AMP) [9], operational transconductance amplifier (OTA) [10], operational transresistance amplifier (OTRA) [11], secondgeneration current conveyor (CCII) [12,13], multiple-output current controlled current conveyor transconductance amplifier (MO-CCCCTA) [14], multiple-output current through transconductance amplifier (MO-CTTA) [15], multiple-output current controlled current differencing transconductance amplifier (MO-CCCDTA) [16], and differential difference current conveyor transconductance amplifier (DDCCTA) [17] have been so far reported in the available literature. Moreover, it is the fundamental block used in many applications such as a triangular/square wave generator [2][3][4], a monostable multivibrator [5,6], and a pulse width modulator [7,8].…”

Section: Introductionmentioning

confidence: 99%

A fully electronically controllable Schmitt trigger and duty cycle‐modulated waveform generator

Kumar

Chaturvedi

Maheshwari

2017

Circuit Theory & Apps

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The paper introduces a new Schmitt trigger consisting of only one multiple-output current inverting differential input transconductance amplifier with no passive element. The proposed circuit is simple and usable up to 100 MHz with the advantage of electronically controlled threshold levels and amplitude of the output. The circuit is also little sensitive to temperature and benefits from low power dissipation (0.5 mW). The amplitude of the output current is tunable electronically from 5 nA to 500 μA, which is a wide tunable range. The effects of transistors mismatch on proposed Schmitt trigger have also been explored. The utility of the proposed circuit is further justified through its application as a triangular/square wave generator, with a maximum frequency of 75 MHz. Duty cycle modulation through electronic means is also shown for the generator circuit, where duty cycle results for 80, 20, and 95% have been included, by varying external control current. The cadence VIRTUOSO simulation results by using generic process design kit 90-nm technology are shown to confirm the proposed theory. The proposed circuits are also verified through experimental results by using commercial integrated circuits: AD844 and LM13700. All the simulated and experimental results promise potential applications of the proposed circuits in instrumentation and communication systems. Figure 9. Monte Carlo sampling results showing the transient responses of V in , V z , and I out at 5 MHz for 150 runs when instance of mismatch is defined for (a) transistors M 5 and M 6 , (b) transistors M 20 and M 21 , and (c) transistors M 5 , M 6 , M 20 , and M 21 . [Colour figure can be viewed at wileyonlinelibrary.com] 2168 A. KUMAR, B. CHATURVEDI AND S. MAHESHWARI Figure 23. Experimentally observed square and triangular waveforms for (a) 80% duty cycle (b) 20% duty cycle (c) 95% duty cycle. [Colour figure can be viewed at wileyonlinelibrary.com] 2178A. KUMAR, B. CHATURVEDI AND S. MAHESHWARI Dostal T. Simply adjustable triangular and square wave generator employing controlled gain current and differential voltage amplifier. In 23th Conference Radioelektronika 2013; 109-114. 33. Chien HC. A current-/voltage-controlled four-slope operation square-/triangular-wave generator and a dual-mode pulse width modulation signal generator employing current-feedback operational amplifiers. Microelectronics Journal 2014; 45(6):634-647. 34. Chaturvedi B, Maheshwari S. Third-order quadrature oscillator circuit with current and voltage outputs.

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“…However, the use of two OTAs in the configuration increases cost, chip area and power consumption. Recently Lo et al proposed a current-input Schmitt trigger employing an operational transresistance amplifier (OTRA), a floating resistor and a switch [16]. It was also previously used in a switch controllable bistable multivibrator and square/triangular wave generator [15,17].…”

mentioning

confidence: 99%

“…It was also previously used in a switch controllable bistable multivibrator and square/triangular wave generator [15,17]. The circuit in [16] provides clockwise (CW) or counterclockwise (CCW) hysteresis depending on the position of the switch but the output saturation voltages are determined by the rated voltages of the OTRA. A Schmitt trigger circuit with two positive-type CCIIs (CCII+s) and four resistors was proposed in [29].…”

mentioning

confidence: 99%

A Simple Schmitt Trigger Circuit with Grounded Passive Elements and Its Application to Square/Triangular Wave Generator

Mınaeı

Yüce

2011

Circuits Syst Signal Process

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This paper introduces a new simple Schmitt trigger circuit using a plustype differential voltage-current conveyor (DVCC+) and only two grounded resistors. The proposed circuit is very simple and enjoys adjustable lower and higher threshold voltages as well as the output saturation levels. The application of the proposed Schmitt trigger circuit to the square/triangular wave generator is also given. Moreover, a current feedback operational amplifier (CFOA)-based square/triangular wave generator is derived from the proposed DVCC+-based circuit. Simulation and experimental results are presented to exhibit the performance of the proposed circuits.

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Current‐input OTRA Schmitt trigger with dual hysteresis modes

Cited by 38 publications

References 42 publications

Fully and electronically controllable current-mode Schmitt triggers employing only single MO-CCCDTA and their applications

Fully and electronically controllable current-mode Schmitt triggers employing only single MO-CCCDTA and their applications

A fully electronically controllable Schmitt trigger and duty cycle‐modulated waveform generator

A Simple Schmitt Trigger Circuit with Grounded Passive Elements and Its Application to Square/Triangular Wave Generator

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