An electronically controlled current-mode triangular/square wave generator employing MO-CFTAs

Inchan, Surasak; Satthaphol, Pracharat; Pipatthitikorn, Paisit; Siripruchyanun, Montree

doi:10.1109/ecticon.2013.6559595

Cited by 1 publication

(1 citation statement)

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“…It is widely used in measurement and instrumentation systems. 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]. 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.…”

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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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