How do you find Vout(t) from Vin(t) and the transfer function?

  • Thread starter Equalizer
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In summary, the conversation discusses a system with a transfer function characteristic H(f) that has a magnitude response of 10f + 1 and a phase response of (5*)f. The goal is to find Vout(t) as Vin(t) is passed through this system. The attempt at a solution involves breaking Vin(t) into separate terms and finding the polar form and particular values for frequency. The problem lies in being able to get H(f) from the given information.
  • #1
Equalizer
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Homework Statement



Suppose Vin(t) = 4cos(2pi*t + 20*) + 3cos(4pi*t + 30*) +5sin(5pi + 50*)V and Vin(t) passes through a system with the following transfer function characteristic H(f):
|H(f)| = 10f + 1 (magnitude response with f in Hz)
<H(f) = (5*)f (phase response)

Find V_0(t) of this system as Vin(t) is passed through it.

Homework Equations



H(f) = Vout(t) / Vin(t)
H(f) = 1 / (1+j(f/f_b))
|H(f)| = 1 / sqrt(1 + (f/f_b)^2)
<H(f) = -arctan(f/f_b)

The Attempt at a Solution



I broke Vin(t) into 3 separate terms and found the polar form of each, as well as the particular value for f

V1 = 4<20*, f1 = 2pi/2pi = 1
V2 = 3<30*, f2 = 4pi/2pi = 2
V3 = 1.31<0*,f3 = 0/2pi = 0

From how I interpret the problem, the statement has a typo and is actually asking for Vout(t). So,

Vout(t) = H(f)*Vin(t)
Vout(t) = H(f1)*V1 + H(f2)*V2 + H(f3)*V3

My problems seems to be that I can not get H(f) from |H(f)| and <H(f). No graph is given. Any advice? Thanks in advance!
 
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  • #2
Equalizer said:

Vout(t) = H(f)*Vin(t)


careful: you can't compare apples and oranges. You just need to put Vin in the frequency domain. You have H(f) though:

H(f) = 1 / (1+j(f/f_b))

now Vout(f) = H(f)*Vin(f) becomes a problem of doing the inverse transform back to the time domain.
 

What is "Find V_out Given V_in"?

"Find V_out Given V_in" is a scientific concept that refers to the process of determining the output voltage (V_out) of a system or circuit, given the input voltage (V_in). It is commonly used in the field of electrical engineering and is an essential step in analyzing and designing electronic systems.

Why is it important to find V_out given V_in?

Finding V_out given V_in is important because it allows scientists and engineers to understand the behavior and performance of a system or circuit. It also helps in troubleshooting and optimizing the system for better efficiency and functionality.

What factors can affect V_out given V_in?

Several factors can affect V_out given V_in, including the type of circuit or system, the components used, the input voltage level, and any external factors such as temperature or interference. It is essential to consider these factors when analyzing and predicting V_out.

What are some methods for finding V_out given V_in?

There are various methods for finding V_out given V_in, depending on the type of circuit or system. Some common methods include using Ohm's law, Kirchhoff's laws, circuit analysis techniques, and simulation software. The appropriate method will depend on the complexity and accuracy required for the analysis.

How can I ensure the accuracy of V_out given V_in?

To ensure the accuracy of V_out given V_in, it is crucial to use reliable and calibrated measurement equipment, follow proper circuit design and analysis techniques, and consider any potential sources of error. It is also helpful to compare the predicted V_out with the actual measured value to verify the accuracy of the analysis.

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