Modeling and simulation of photovoltaic cells or PV cell is becoming important as it provides an easy platform to perform studies on photovoltaic cells and the design and analysis of the system based on photovoltaic cells. In this paper, we present our study of the ordinary photovoltaic module on the basis of one diode and two diode models. Studies are extended to solar cells as solar cells are similar to photodiodes. Performance of the solar cells may be described in terms of ideality factor (α), which decreases with temperature and is observed to affect the performance of the PV cell. PV systems exhibit better performance with diodes having higher values for α. In this paper, our efforts are to study the effects of α on Current and Power versus Voltage characteristics of the solar cells. MATLAB simulation of solar cell systems is a simple and elegant mechanism useful for designing and modeling the framework of the solar power plant

Built in self testing (BIST) is most attractive technique to test different kind of circuits. In BIST, test patterns are generated by different techniques of test pattern generation and applied to the circuit under test (CUT). In pseudorandom BIST architecture, test patterns are generated by Linear Feedback Shift Register (LFSR). Due to high Switching in pattern generation by conventional LFSR, power dissipation is high in conventional LFSR. Power is an important constraint in VLSI (Very Large Scale Integration) testing. This paper presents a modification in LFSR to generate pattern for BIST applications with reduced power requirement. This new technique represent low transition pattern pseudorandom generator (LT-PRG) for Test-per-Clock and Test-per-Scan BIST applications. The LT-PRPG is designed with the use of a LFSR and a 2x1 multiplexer. Experimental results show that the implementation of Bit-Swapping LFSR can reduce the internal transition activity probability which directly affect the dissipation of power in CUT without affecting the fault coverage.

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