American Journal of Electrical and Electronic Engineering

This study proposes a novel square/triangular wave generator based on a dual outputs differential voltage current conveyor (DO-DVCC). The proposed circuit uses one DO-DVCC combined with three grounded passive components. The presented scheme reveals a compact topology and can produce square/triangular waveform simultaneously. To verify their feasibility, commercially available ICs were used for implementing the prototype circuits. Experimental results revealed consistency with theoretical analyses.

American Journal of Electrical and Electronic Engineering. 2013, 1(2), 32-36. DOI: 10.12691/ajeee-1-2-3
Pub. Date: May 18, 2013

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Coupled Electromagnetic and Thermal Analysis of Single-Phase Insulated High-Current Busducts and GIL Systems

by Petar Sarajcev, Ivo Martinac and Zdenko Radic

Original Research

This paper presents a mathematical model for the coupled electromagnetic and thermal analysis of the single-phase insulated high-current busducts of circular cross-section geometry and of gas-insulated transmission lines (GIL). The mathematical model, accompanied by a numerical solution procedure, features an exact current distribution in phase conductors and shields of the busduct or GIL system, accounting for the skin and proximity effects, and including the complete electromagnetic coupling between phase conductors and shields. The current distribution is based on the conductor filament method in combination with the mesh-current method. The mathematical model further couples the analysis of current distribution with the computation of (Joule) power losses and subsequent temperature increase in the high-current busducts or GIL systems, accounting for the material properties (electrical conductivity, thermal emission and convection coefficients) as well as for the surrounding ambient properties (ambient temperature, wind and solar radiation influences).

American Journal of Electrical and Electronic Engineering. 2013, 1(2), 23-31. DOI: 10.12691/ajeee-1-2-2
Pub. Date: April 26, 2013

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A High Resolution First Order Noise-Shaping Vernier Time-to-Digital Converter

by Majid Memarian Sorkhabi and Siroos Toofan

Original Research

In this paper, we propose a noise reduction method for a Vernier Time-to-Digital Converter (VTDC) using a first-order noise shaping structure and a gated ring oscillator (GRO). An 11bit VTDC with 4 p s effective resolution was designed and developed for a high performance All Digital Frequency Synthesizer (ADFS). The VTDC realized in 180nm CMOS, its power consumption depending on the time difference between input edges; 1 to 11mA from a 1.5 V supply.

American Journal of Electrical and Electronic Engineering. 2013, 1(2), 19-22. DOI: 10.12691/ajeee-1-2-1
Pub. Date: April 27, 2013

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