3. Pulse Width Modulator Design: Prepare a review about Pulse Width Modulator (definition, application area, and types should be mentioned). Simulate the below circuit and report the results (LTspice, MATLAB, or any other software could be used). Explain all components (capacitors, inductors, resistors and etc) functions. +12V Ri 1k www PWM output C: 0.1 Audio input CVRI HA741 10k 0.01 I www R 10k -12V Connect a 4V,500Hz sine wave to the Audio input. Adjust the VR, to get the voltage of OV at the Vin (+) input terminal and observe and record the output. Record the output for different Audio inputs ("5V,,,1kHz" and "10V, 50kH Adjust VR: to get the 6V at the Vin (+) input terminal and repeat previous steps. Give the results as a chart and table too