1 Problem For circuit A in the appendix: • Determine the current profile i(t) in response to a step-input of Vo volts using the impedance method. (Hint: find the impedance of the total circuit Zcircuit, solve for I(s) assuming V(s) is the desired step input, and use the inverse Laplace transform.) • Determine the voltage profile Ucap (t) across the capacitor in response to a step-input of Vo volts using the impedance method. (Hint: use the ratio of Zcircuit to Zcap to find the desired transfer function, as described in the notes.) • If R = 10 ohm and C = 15μF how long does it take the capacitor's voltage to reach ≈ 2% of Vo? (Hint: determine the time constant first)
Transfer function
A transfer function (also known as system function or network function) of a system, subsystem, or component is a mathematical function that modifies the output of a system in each possible input. They are widely used in electronics and control systems.
Convolution Integral
Among all the electrical engineering students, this topic of convolution integral is very confusing. It is a mathematical operation of two functions f and g that produce another third type of function (f * g) , and this expresses how the shape of one is modified with the help of the other one. The process of computing it and the result function is known as convolution. After one is reversed and shifted, it is defined as the integral of the product of two functions. After producing the convolution function, the integral is evaluated for all the values of shift. The convolution integral has some similar features with the cross-correlation. The continuous or discrete variables for real-valued functions differ from cross-correlation (f * g) only by either of the two f(x) or g(x) is reflected about the y-axis or not. Therefore, it is a cross-correlation of f(x) and g(-x) or f(-x) and g(x), the cross-correlation operator is the adjoint of the operator of the convolution for complex-valued piecewise functions.
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