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access icon free Novel CMOS MO-CFDITA based fully electronically controlled square/triangular wave generator with adjustable duty cycle

© The Institution of Engineering and Technology
Received 21/12/2017, Accepted 13/04/2018, Published 18/04/2018

This study presents a novel square/triangular wave generator based on multiple-output current follower differential input transconductance amplifier (MO-CFDITA) with reduced complexity in terms of transistors. The proposed generator comprises of single MO-CFDITA and one grounded capacitor only which makes the proposed generator circuit suitable to integrated circuit implementation. The proposed generator provides output square wave in current mode and output triangular wave in voltage mode. The amplitude of current-mode square wave is electronically and independently tunable via bias current. The DC level of the triangular wave is also electronically adjustable. The proposed generator has dual-slope operation and its duty cycle is adjustable with the help of DC current source over a range of 5–95%. The proposed generator consumes a power of 1.45 mW only and it is usable up to 50 MHz which is quite good operating frequency range. To examine the performance of the proposed generator, the cadence VIRTUOSO simulation results have been depicted. Additionally, the simulation results and performance parameters of complementary metal–oxide–semiconductor (CMOS) MO-CFDITA are included. The practicality of the proposed generator is verified through the experimental results.

Inspec keywords: low-power electronics; square-wave generators; CMOS integrated circuits; capacitors; operational amplifiers; current-mode circuits

Other keywords: square/triangular wave generator; multiple-output current follower differential input transconductance amplifier; CMOS MO-CFDITA; power 1.45 mW; MO-CFDITA; frequency 50.0 MHz; complementary metal–oxide–semiconductor

Subjects: CMOS integrated circuits; Amplifiers; Function generators

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