OTA- and CFOA-based Duty-cycle Tunable Square/Triangular Wave Generator with Independently Controllable Frequency and Amplitude

Hung-Chun Chien

doi:10.6180/jase.201909_22(3).0020

OTA- and CFOA-based Duty-cycle Tunable Square/Triangular Wave Generator with Independently Controllable Frequency and Amplitude

Electro-Mechanical Engineering

Hung-Chun Chien This email address is being protected from spambots. You need JavaScript enabled to view it.¹

¹Department of Electronic Engineering, Ming Chuan University, Taoyuan, Taiwan 333, R.O.C.

Received: November 19, 2018
Accepted: May 29, 2019
Publication Date: September 1, 2019

Download Citation: ||https://doi.org/10.6180/jase.201909_22(3).0020

ABSTRACT

This paper presents a new design of a square/triangular wave generator. The proposed circuit features a compact circuitry and can control the operating frequency, output amplitude, and duty-cycle by tuning diverse circuit parameters. This paper first reviews several previous designs used to produce square/triangular wave generators followed by circuit principles, governing formulas, non ideality problems, and design procedures. For conducting the experiments, a prototype circuit is implemented using commercially available AD844 and LM13700 integrated circuits (ICs) and discrete passive components on a breadboard. The PSpice simulations and experimental results demonstrate the feasibility of the circuit and verify the theoretical analyses.

Keywords: Current-feedback Operational Amplifier (CFOA), Duty-cycle Tunable, Square/Triangular Wave Generator, Operational Transconductance Amplifier (OTA)

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