ENGI39587: Operational Amplifier Applications - Floating Variable Policy - Engineering Assignment Help

Assignment Task:

Introduction

• In this lab assignment, you will design a measurement, and control circuit using operational amplifiers.

• Use NI Multisim, available on Sheridan AppsAnywhere, to complete the activities described in this lab instruction. Answer the analytical questions and calculate the required parameters.

• Submit the lab report as one PDF file through the assignment folder created for Lab Assignment 7 on SLATE. Name the file as ENGI39587_Lab7_Your First Name-Your Last Name.

• Submit the Multisim file(s) (.ms14) along with the lab report using the same assignment folder. Name the file as ENGI39587_Lab7_Your First Name-Your Last Name.

System Description

The system in this application monitors the room temperature and turns on and off two LEDs. If the temperature exceeds Tmax=26+0.5×ZoC, the red LED switches on, and if the temperature drops below Tmin=24-0.5×Z oC, the green LED should turn on. LM35 is an analog temperature sensor. The output voltage of the sensor is amplified by an instrumentation amplifier with a gain of 10. For example, at 22oC, the sensor output is 220 mV, so the amplifier output reaches 2.2 V. Multisim does not support this sensor, but you can imitate it by using the DC_INTERACTIVE_VOLTAGE source. Set the voltage range as if the temperature changes in the range of 0oC to 50oC.

The Schmitt trigger circuit compares the output of the amplifier with the threshold levels Vmax and Vmin, where Vmax is the voltage of the LM35 sensor (DC_INTERACTIVE_VOLTAGE in your circuit) when the temperature is Tmax and Vmin is the voltage of the sensor when the temperature is Tmin. So, when the room temperature is over TmaxoC, the output voltage of the Schmitt trigger circuit is +VS (High). The output voltage of the Schmitt trigger circuit changes to –VS (Low) as the temperature drops below TminoC.

Amplifier

1. Design an instrumentation amplifier with a gain of 10. You may use the 3 operational amplifiers circuit studied in the lecture or an instrumentation amplifier Integrated Circuit such as AD624. 

Apply the DC_INTERACTIVE_VOLTAGE source to the instrumentation amplifier. Simulate the amplifier and ensure the voltage gain is 10 using voltage probe. Modify the circuit if required. 

Show all your calculations and attach the screenshot of the circuit schematic and simulation results to the lab report. (2 marks)

Schmitt Trigger

2. Design a non-inverting comparator with hysteresis (Schmitt trigger) with the upper threshold level of VUTP=Vmax and the lower threshold level of VLTP=Vmin. 

Apply a low-frequency triangle signal that varies from 0 to +5V to the input of the Schmitt trigger circuit. This range of voltage models temperature variation from 0oC to 50 oC. 

Simulate the Schmitt trigger and ensure the trigger levels are Vmax and Vmin.

Modify the circuit if required.

Show all your calculations and attach the screenshot of the circuit schematic and simulation results to the lab report. (2 marks)

LED Switching Circuit

3. The purpose of this circuit is to switch the red and green LED on and off according to the system requirement. The input of this subsystem is the output of the comparator (Schmitt trigger) circuit or VOUT. The system should switch the LEDs as follows,

If VOUT > Vmax (temperature is higher than Tmax), red LED is on.

If VOUT < Vmin (temperature is lower than Tmin), the green LED is on.

You should limit the current in LEDs to 50 mA. (2 marks)

System

4. Construct the system by cascading the DC_INTERACTIVE_VOLTAGE (as if it is your sensor), amplifier, Schmitt trigger, and LED switching circuit. Change the voltage source gradually as if the temperature changes from 0 to +50oC and make sure the LEDs are switching at the threshold levels. 

Modify the circuit if required.

Attach the circuit file of the full system to the lab report. (2 marks)

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