ENGR338 Lab 2021 Spring
Lab 2
Name: Nicolas Llarena
 Email: Njllarenaarias@fortlewis.edu

1. Lab 2 - Working with DACs and ElectricVLSI

2. Introduction
The Purpose of this lab is to get familiar with Electric VLSI by using ADCs and DACs together by creating schematics. We will use LTSpice as well to be able to simulate the circuits to confirm hand calculations. This will help us practice with different softwares for future labs.

3. Materials
Materials Quantity
LTSpice Software
 1
Calculator
 1
ElectricVLSI Software
 1

4. Results

Task 1



Figure 1. After downloading and using the provided ideal ADC_DAC sch, a simultation was created on LTSpice to display a discrete signal to track the analog sine wave from vin.

        


Task 2
      
Figure 2. Figures above show the R_2R Ladder built along with the schematic where it is connected to the ideal ADC.

      
Figure 3. Figures above show a DRC check from Electric VLSI showing no errors, The schematic was sent to LTSpice to do the simulation of the newly made schematic.
Task 3


Figure 4. New schematic using the R_2R_Ladder, pins B0-B8 where grounded and B9 was connected to a Pulse. a 10pF capacitor was added as a load to check for time delay.

      
Figure 5. Left image shows hand calculation of the RC circuit transformed into a Thevenin's Equivalent circuit and calculation of time delay. Second image shows the simulation in LTSpice confirming the time delay.


Discussion

This lab took longer than I expected since i went through some of the tutorial pages to learn how to use Electric VLSI. I took the time to learn how to use it because I believe it is important. I learned many new things in this lab, most things related to Electric VLSI and how to use it together with LTSpice to simulate different circuits. I look forward to using both of these softwares in the future.