Analog Signal Processing Spring 2014

Instructor : Dr Juan Alvarez

T.A : Trung Mai Van

Due Date : Thursday, February 20th, 2014

The values of the symbolic denotations in the circuits will be assigned to each student in a

Excel file sent together with the assignment.

Remember to create each folder when you perform the simulation for each question.

1. Circuit Analysis

Figure 1

a. Calculate the current through R and the power dissipation of the resistor R.

b. Simulate the circuit in figure 1 in Pspice and then compare with your calculated

results in part a. (Using Bias Point Simulation Settings)

2. Thevenins Circuit

Figure 2

a. Calculate and the power dissipation on resistor R.

b. Determine the Thevenin voltage and resistance between the nodes a and b.

c. Simulate the circuit in figure 2 in Pspice and compare with your calculated results in

part b. (Using Bias Point Simulation Settings)

3. Op Amps

The output of an industrial standard sensor is in the range from 4 uA to 20 uA. This signal

will be fed to an Analog to Digital Converter (ADC) which requires a voltage from 0 to 5VDC.

Design a circuit based on Op Amps in order to feed the signal collected from the sensor to

the ADC with the input requirement as specified before. (Hint : Using the non inverting

amplifier configuration)

4. Sallen Key Model

Design a low pass filter with cut off frequency (fc) based on the Sallen Key model

below

The students are expected to design the transfer function in Matlab and then translate into

Pspice simulation in order to check its frequency response.

5. Ladder network based filter

Design a 6th order Butterworth low pass filter based on ladder network with the cut

off frequency (fco).

The student have to show the steps to design the circuit and the simulation results in

Pspice.