Electronics Devices Laboratory ECE 2300 Gregg Chapman and ...€¦ · (The Real Deal) 2 pole low...
Transcript of Electronics Devices Laboratory ECE 2300 Gregg Chapman and ...€¦ · (The Real Deal) 2 pole low...
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ECE 2300
Electronics Circuits and
Electronics Devices Laboratory
Gregg Chapman
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Laboratory 5Operational Amplifiers 2
Active Filters
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Background
• Filter Configurations
• Cutoff Frequencies
• Gain
• Frequency Response
Screencast: 0:12
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First Order Low Pass Active Filter
From - http://en.wikipedia.org/wiki/filters/ , Accessed July 14, 2012Screencast: 0:26
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First Order Low Pass Active Filter
From - http://www.electronics-tutorials.ws, Accessed July 14, 2012
Screencast: 1:00
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First Order High Pass Active Filter
From - http://en.wikipedia.org/wiki/filters/ , Accessed July 14, 2012Screencast: 1:29
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First Order High Pass Active Filter
From - http://www.electronics-tutorials.ws, Accessed July 14, 2012Screencast: 1:45
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First Order Band Pass Active Filter
Screencast: 2:08
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First Order Band Pass Active Filter
From - http://www.electronics-tutorials.ws, Accessed July 14, 2012Screencast: 2:39
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Sallen-Key Filters(The Real Deal)
2 pole low pass filter with unity gain 2 pole high pass filter with unity gain
Band pass filter with non-inverting gain
See: pp. 777-778 of Rizzoni: Principles and Applications of Electrical Engineering, 3rd Edition
Screencast: 3:15
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Lab Supplies
• Resistors
2 16.2 KOhm
• Capacitors
2 0.01 uF Ceramic
2 1.0 uF Tantalum
1 1000 pF Ceramic
1 0.1 uF Ceramic
• IC 1 LME49710NA Op Amp
Screencast: 4:22
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Lab Supplies• Breadboard
• Oscilloscope
• Function Generator
• Power Supply
• BNC-to-Mini-grabber (2)
• BNC Cable
• BNC T-Adapter
• Red Banana-to-Mini-grabber (2)
• Black Banana-to-Mini-grabber (1)
Screencast: 4:44
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Cabling
Screencast: 5:06
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Test Set-up
• BNC T-Adapter on output of Function Generator
• BNC cable from T-Adapter to Channel 1 of the Oscilloscope
• BNC to Mini-clip from T-Adapter to the input
• BNC to Mini-clip from Channel 2 of the Oscilloscope to the output
• Use the three Banana-to-Mini-clip cables for +12V, -12V and GND
Screencast: 5:11
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Function Generator Setup
• Sine Wave
• 5V peak-to-peak amplitude
• Begin with 10 Hz
Screencast: 5:29
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Circuits
1. Low Pass Filter
2. High Pass Filter
3. Band Pass Filter
Screencast: 5:51
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Low Pass Filter
Screencast: 5:58
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High Pass Filter
Screencast: 6:30
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Band Pass Filter
Screencast: 6:44
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Measurements
• Measured Cutoff Frequency is at – 3dB
• Phase Shift is in degrees:
• Define un-attenuated frequency is > 95% of Vin
Screencast: 7:03
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Calculations
Cutoff Frequency:
NOTE: Use Ohms and Farads for calculationsScreencast: 8:33
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ResultsLaboratory 5
CircuitCalculatedCutoff(Hz)
Measured Cutoff(fc)(Hz)
Phase Shift (at fc)(degs)
Un-attenuatedFrequency
(Hz)
Low Pass Filter
High Pass Filter
Band Pass Filter
Low CutoffFrequency
High CutoffFrequency
Screencast: 8:51
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Measurements
Frequency (Hz) V in V out
10
20
50
100
200
500
1000
2000
5000
10,000
20,000
50,000
100,000
200,000
Note: These values are a suggested starting point.Please find the cutoff frequencies as closely as possible to the -3 dB values
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Schematic – Lab 5
Circuit 1:Circuit 3:
Circuit 2: