  Anyone who looks into the circuitry world will be familiar with the three
fundamental circuit elements - capacitor, resistor, and inductor. These circuit
elements are defined by the relation between two of the four fundamental
circuit variables current, voltage, charge, and flux. However, in 1971, Prof.
Leon Chua proposed on the grounds of symmetry that there should be a fourth
fundamental circuit element that gives the relation between flux and charge. He
named this the memristor, which is short for memory resistor. This theory was
then practicallymodeled, in May 2008 when the researchers at HP Labs published
a paper announcing a model for a physical realization of a memristor. This
report mainly focuses on the model of memristor and its applications. The
advantages of variable resistance, flexibility, no leakage current, and
compatibility with CMOS. The element memristor exhibits different
characteristics for different applications which results in the formation of
different models of the memristor. This paper gives a review of different
models of the memristor. Memristors devices can be used in many applications
such as memory, logic, and neuromorphic systems. A computer model of the
memristor would be a useful tool for analyzing circuit behavior to help in
developing the application of this memristor is a passive circuit element via
simulation. In this paper, various VerilogA model of memristor devices are
simulated for sinusoidal inputs and output are verified Various window
functions has been used. The circuit analysis of the various memristor models
is done
