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

Abstract

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.