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university:courses:electronics:electronics-lab-envelope-detector [20 Mar 2018 17:22] – Biased Envelope Detector: Add HW Setup + Procedure Antoniu Miclausuniversity:courses:electronics:electronics-lab-envelope-detector [03 Jan 2021 22:21] – fix links Robin Getz
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 ===== Objective ===== ===== Objective =====
  
-In this lab activity we will use [[http://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/adalm2000.html|ADALM2000]] and [[university:tools:m2k:scopy|Scopy]] to introduce envelope detection and amplitude modulation. The signal's envelope is equivalent to its outline, and an envelope detector connects all the peaks in this signal. Envelope detection has numerous applications in the fields of signal processing and communications, one of which is amplitude modulation (AM) detection.+In this lab activity we will use [[adi>en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/adalm2000.html|ADALM2000]] and [[university:tools:m2k:scopy|Scopy]] to introduce envelope detection and amplitude modulation. The signal's envelope is equivalent to its outline, and an envelope detector connects all the peaks in this signal. Envelope detection has numerous applications in the fields of signal processing and communications, one of which is amplitude modulation (AM) detection.
  
 Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to the waveform being transmitted. That waveform may, for instance, correspond to the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels.  Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to the waveform being transmitted. That waveform may, for instance, correspond to the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels. 
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 Consider the circuit presented in Figure 1. Consider the circuit presented in Figure 1.
  
-<WRAP centeralign>{{:university:courses:electronics:env_detector-sch.png?500|}}</WRAP>+<WRAP centeralign>{{ :university:courses:electronics:env_detector_ltspice.png?400 |}}</WRAP>
  
 <WRAP centeralign> Figure 1. Basic Envelope Detector Circuit </WRAP> <WRAP centeralign> Figure 1. Basic Envelope Detector Circuit </WRAP>
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 Consider the circuit presented in Figure 9. Consider the circuit presented in Figure 9.
  
-<WRAP centeralign>{{:university:courses:electronics:ext_env_detector-sch.png?400|}}</WRAP>+<WRAP centeralign>{{ :university:courses:electronics:ext_env_det.png?400 |}}</WRAP>
  
 <WRAP centeralign> Figure 9. Positive and negative Envelope Detector Circuit </WRAP> <WRAP centeralign> Figure 9. Positive and negative Envelope Detector Circuit </WRAP>
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 ==== Materials ==== ==== Materials ====
  
-ADALM1000 Active Learning Module +ADALM1000 Active Learning Module\\ 
-Solder-less breadboard, and jumper wire kit +Solder-less breadboard, and jumper wire kit\\ 
-1 - 1.5 KΩ resistor (brown green red) +1 - 1.5 KΩ resistor (brown green red)\\ 
-1 - 10 KΩ resistor (brown black orange) +1 - 10 KΩ resistor (brown black orange)\\ 
-1 - 20 KΩ resistor (red black orange) +1 - 20 KΩ resistor (red black orange)\\ 
-2 - 1.0uF capacitor, C1, C2 +2 - 1.0uF capacitor, C1, C2\\ 
-1 - 2N3904 NPN transistor +1 - 2N3904 NPN transistor\\ 
-1 - 1N914 diode+1 - 1N914 diode\\
  
 ==== Background ==== ==== Background ====
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 Consider the circuit shown in Figure 14. Consider the circuit shown in Figure 14.
  
-<WRAP centeralign>{{:university:courses:electronics:bias_env_detector-sch.png|}}</WRAP>+<WRAP centeralign>{{ :university:courses:electronics:bias_env_detector.png?400 |}}</WRAP>
  
 <WRAP centeralign> Figure 14. Biased Envelope Detector circuit </WRAP> <WRAP centeralign> Figure 14. Biased Envelope Detector circuit </WRAP>
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 ==== Procedure ==== ==== Procedure ====
 +
 +Connect the circuit to 5V supply.
  
 To test this circuit first use the same modulated signal you used in the simple diode envelope detector example. Compare the new design to the simple diode envelope detector. Using the same steps as earlier generate AM signals with smaller amplitudes / higher modulation indexes and compare the outputs of these two detector designs. To test this circuit first use the same modulated signal you used in the simple diode envelope detector example. Compare the new design to the simple diode envelope detector. Using the same steps as earlier generate AM signals with smaller amplitudes / higher modulation indexes and compare the outputs of these two detector designs.
  
-A plot example of the input and output waveforms is presented in Figure 16.+A plot example of the input and output waveforms for the biased envelope detector is presented in Figure 16.
  
 <WRAP centeralign>{{:university:courses:electronics:bias_env_detector-wav.png|}}</WRAP> <WRAP centeralign>{{:university:courses:electronics:bias_env_detector-wav.png|}}</WRAP>
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 ===== Further Reading ===== ===== Further Reading =====
 +
 +<WRAP round download>
 +**Lab Resources:**
 +  * Fritzing files: [[downgit>education_tools/tree/master/m2k/fritzing/env_detector_bb | env_detector_bb]]
 +  * LTspice files: [[downgit>education_tools/tree/master/m2k/ltspice/env_detector_ltspice | env_detector_ltspice]]
 +</WRAP>
  
 Additional resources: Additional resources:
  
-  * [[http://www.analog.com/en/technical-articles/integrated-diode-based-rf-detectors.html|Understanding, Operating, and Interfacing to Integrated Diode-Based RF Detectors]] +  * [[adi>en/technical-articles/integrated-diode-based-rf-detectors.html|Understanding, Operating, and Interfacing to Integrated Diode-Based RF Detectors]] 
-  * [[http://www.analog.com/media/en/technical-documentation/application-notes/AN-423.pdf|Amplitude Modulation of the AD9850 Direct Digital Synthesizer]] +  * [[adi>media/en/technical-documentation/application-notes/AN-423.pdf|Amplitude Modulation of the AD9850 Direct Digital Synthesizer]] 
-  * [[http://www.analog.com/en/analog-dialogue/raqs/raq-issue-92.html|Multipliers and Modulators]] +  * [[adi>en/analog-dialogue/raqs/raq-issue-92.html|Multipliers and Modulators]] 
-  * [[http://www.analog.com/media/en/technical-documentation/data-sheets/ADL5511.pdf|Envelope and TruPwr RMS Detector+  * [[adi>media/en/technical-documentation/data-sheets/ADL5511.pdf|Envelope and TruPwr RMS Detector
 ]] ]]
- 
- 
- 
  
 **Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]]** **Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]]**
  
  
university/courses/electronics/electronics-lab-envelope-detector.txt · Last modified: 10 Mar 2021 17:35 by Cristina Suteu

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