TUNABLE WAVEFORM GENERATORS USING SINGLE DUAL-CURRENT OUTPUT OTAs

Author:

LO YU-KANG1,CHIEN HUNG-CHUN2,CHIU HUANG-JEN1

Affiliation:

1. Department of Electronic Engineering, Jinwen University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei, 10607, Taiwan, R.O.C

2. Department of Electronic Engineering, Jinwen University of Science and Technology, No. 99, Anchung Road, Hsintien City, Taipei, 23154, Taiwan, R.O.C.

Abstract

Two novel electronic-tunable waveform generators using a single dual-current output operational transconductance amplifier (DO-OTA) with a few passive components are proposed in this paper. The first one can produce symmetrical square and triangular waveforms simultaneously. Based on the first topology, an additional N-MOS is adopted as a switching element to construct the second proposed circuit, which can generate a pulse waveform by a negative triggering signal. The repetitive frequency and pulse width of the presented circuits are adjustable by external passive components. Moreover, the output levels of the proposed circuits can be controlled by the DO-OTA's bias currents. These waveform generators feature more compact configurations compared to the existing designs. Experimental results are close to the theoretical analyses.

Publisher

World Scientific Pub Co Pte Lt

Subject

Electrical and Electronic Engineering,Hardware and Architecture,Electrical and Electronic Engineering,Hardware and Architecture

Reference11 articles.

1. A. S. Sedra and K. C. Smith, Microelectronic Circuits, 4th edn. (Oxford University Press, New York, 2004) p. 1990.

2. Second-order OTA-C filters derived from Nawrocki-Klein biquad

3. Synthesis of operational transconductance amplifier-based analog fuzzy functional blocks and its application

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