EE 200 Design Tools Laboratory 3 Professor Jeffrey Schiano Department of Electrical Engineering EE 200 Fall 2013 Lab 3 1 Laboratory 3 Topics EE 210 Review Phasors and Filters Mixed Signal Simulation using Multisim myThermometer myDAQ and Formula Nodes EE 200 Fall 2013 Lab 3 2 Lowpass Filters in EE 200 Analog to Digital Conversion ADC A D A2D Transforms an analog signal to a digital signal Lowpass filters proceed ADCs to avoid aliasing a phenomenon where the sampling process causes high frequency analog signals to appear as low frequency digital signals Later this semester we will consider ADCs and aliasing in greater depth EE 200 Fall 2013 Lab 3 3 Exercise 1 Consider an RC circuit with input f t and output y t f t R C y t Determine the ratio of the phasors of y t and f t For o 1 RC find the steady state response y t for f t cos 0 1 o t cos 1 0 o t cos 10 o t EE 200 Fall 2013 Lab 3 4 Exercise 1 EE 200 Fall 2013 Lab 3 5 Exercise 1 EE 200 Fall 2013 Lab 3 6 Exercise 1 EE 200 Fall 2013 Lab 3 7 Exercise 1 EE 200 Fall 2013 Lab 3 8 NI Multisim Course Goals Understand the features of the Multisim user interface Capture schematics in Multisim Use interactive simulation to check your design Mixed signal circuits Use virtual instruments and analyses Create custom components EE 200 Fall 2013 Lab 3 9 Mixed Signal Circuit Simulation Circuits containing both analog and digital signals are referred to as mixed signal circuits Owing to the nonlinear dynamic behavior of devices simulation of mixed signal circuits requires knowledge of both the device models and numerical integration methods both beyond the scope of EE 200 A laboratory exercise demonstrates that simulation tools such as Multisim yield an incorrect results when used improperly EE 200 Fall 2013 Lab 3 10 Exercise 2 Consider the ring oscillator from Lab 2 with VDD 5V vout TH 5V CMOS Rs vout CMOS 0V C R 7 5V vf TL vf 2 5V 2 5V t t Choose Rs 120 k R 56 k C 0 22 F 1 f 37 Hz T 1 27 ms 2 RC ln 3 f EE 200 Fall 2013 Lab 3 11 Exercise 2 Schematic Capture Realize using a CD4011BD Quad 2 Input NAND Gate and observe waveforms using the Agilent oscilloscope EE 200 Fall 2013 Lab 3 12 Simulation with Default Settings What is wrong Shape of the waveform for vf blue curve channel 2 Amplitude of the waveform for vf EE 200 Fall 2013 Lab 3 13 Modification Initial Conditions Set initial output state of U1A low 0V and U1B high 5V EE 200 Fall 2013 Lab 3 14 Modification Analysis Options Simulate Interactive simulation settings EE 200 Fall 2013 Lab 3 15 Modification Analysis Options Simulate Interactive simulation settings Select Use custom settings on Analysis options tab Set number of iterations and integration method as shown EE 200 Fall 2013 Lab 3 16 Simulation with Custom Settings Agrees with theoretical analysis Shape of the waveform for vf blue curve channel 2 Amplitude of the waveform for vf EE 200 Fall 2013 Lab 3 17 LabVIEW Exercises myDAQ Resistance Measurements NI Educational Laboratory Virtual Instrumentation Suite NI ELVISmx Instrument Launcher NI ELVISmx Express VIs An Express VI is a VI whose settings you can configure interactively through a dialog box Measuring temperature using thermistors myThermometer Formula Nodes EE 200 Fall 2013 Lab 3 18 NI ELVISmx Instrument Launcher EE 200 Fall 2013 Lab 3 19 Exercise 3 Using the NI ELVISmx DMM Express VI write a VI that measures and displays resistance EE 200 Fall 2013 Lab 3 20 Thermistors A thermistor is a type of resistor whose resistance varies significantly with temperature Relationship between temperature and resistance Specifications for Agilent E2309A Thermistor Probe R1 5000 Ohms when T1 25 C 25 C 125 C resistance ratio of R1 R2 29 6 EE 200 Fall 2013 Lab 3 21 Determining A and B EE 200 Fall 2013 Lab 3 22 LabVIEW Formula Node Evaluates mathematical formulas and expressions similar to C on the block diagram EE 200 Fall 2013 Lab 3 23 Exercise 4 myThermometer VI EE 200 Fall 2013 Lab 3 24 EE 200 Design Tools Laboratory 3 Professor Jeffrey Schiano Department of Electrical Engineering EE 200 Fall 2013 Lab 3 1 Laboratory 3 Topics EE 210 Review Phasors and Filters Mixed Signal Simulation using Multisim myThermometer myDAQ and Formula Nodes EE 200 Fall 2013 Lab 3 2 Lowpass Filters in EE 200 Analog to Digital Conversion ADC A D A2D Transforms an analog signal to a digital signal Lowpass filters proceed ADCs to avoid aliasing a phenomenon where the sampling process causes high frequency analog signals to appear as low frequency digital signals Later this semester we will consider ADCs and aliasing in greater depth EE 200 Fall 2013 Lab 3 3 Exercise 1 Consider an RC circuit with input f t and output y t Determine the ratio of the phasors of y t and f t For o 1 RC find the steady state response y t for f t cos 0 1 o t cos 1 0 o t cos 10 o t EE 200 Fall 2013 Lab 3 4 Exercise 1 EE 200 Fall 2013 Lab 3 5 Exercise 1 EE 200 Fall 2013 Lab 3 6 Exercise 1 EE 200 Fall 2013 Lab 3 7 Exercise 1 EE 200 Fall 2013 Lab 3 8 NI Multisim Course Goals Understand the features of the Multisim user interface Capture schematics in Multisim Use interactive simulation to check your design Mixed signal circuits Use virtual instruments and analyses Create custom components EE 200 Fall 2013 Lab 3 9 Mixed Signal Circuit Simulation Circuits containing both analog and digital signals are referred to as mixed signal circuits Owing to the nonlinear dynamic behavior of devices simulation of mixed signal circuits requires knowledge of both the device models and numerical integration methods both beyond the scope of EE 200 A laboratory exercise demonstrates that simulation tools such as Multisim yield an incorrect results when used improperly EE 200 Fall 2013 Lab 3 10 Exercise 2 Consider the ring oscillator from Lab 2 with VDD 5V Choose Rs 120 k R 56 k C 0 22 F EE 200 Fall 2013 Lab 3 11 Exercise 2 Schematic Capture Realize using a CD4011BD Quad 2 Input NAND Gate and observe waveforms using the Agilent oscilloscope EE 200 Fall 2013 Lab 3 12 Simulation with Default Settings What is wrong Shape of the waveform for vf blue curve channel 2 Amplitude of the waveform for vf EE 200 Fall 2013 Lab 3 13 Modification Initial Conditions Set initial output state of U1A low 0V and U1B high 5V EE 200 Fall 2013 Lab 3 14 Modification Analysis Options Simulate Interactive simulation settings EE 200 Fall 2013 Lab 3 15 Modification Analysis Options Simulate Interactive simulation settings Select Use custom settings on Analysis options tab Set number of iterations