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university:courses:electronics:electronics-lab-envelope-detector [22 Feb 2018 17:01] – add procedure Antoniu Miclausuniversity:courses:electronics:electronics-lab-envelope-detector [28 Feb 2018 11:29] – add extended envelope detector Antoniu Miclaus
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 ====== Activity: Envelope Detector ====== ====== Activity: Envelope Detector ======
  
-===== 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]] 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 [[http://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/adalm2000.html|ADALM2000]] 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.
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-==== Materials: =====+==== Materials =====
  
 ADALM2000 Active Learning Module\\ ADALM2000 Active Learning Module\\
 Solder-less breadboard, and jumper wire kit\\ Solder-less breadboard, and jumper wire kit\\
-1 - 1 KΩ resistor\\ +2 - 1 KΩ resistor\\ 
-1 - 1uF capacitor\\ +2 - 1uF capacitor\\ 
-1 - 1N914 diode\\+2 - 1N914 diode\\
  
 ===== Envelope Detector ===== ===== Envelope Detector =====
 +
 +==== Background ====
  
 Consider the circuit presented in Figure 1. Consider the circuit presented in Figure 1.
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 <WRAP centeralign>{{:university:courses:electronics:env_detector-sch.png?500|}}</WRAP> <WRAP centeralign>{{:university:courses:electronics:env_detector-sch.png?500|}}</WRAP>
  
-<WRAP centeralign> Figure 1. Envelope Detector Circuit </WRAP>+<WRAP centeralign> Figure 1. Basic Envelope Detector Circuit </WRAP>
  
  
 The capacitor in the circuit stores up charge on the rising edge, and releases it slowly through the resistor when the signal falls. The diode in series rectifies the incoming signal, allowing current flow only when the positive input terminal is at a higher potential than the negative input terminal. The capacitor in the circuit stores up charge on the rising edge, and releases it slowly through the resistor when the signal falls. The diode in series rectifies the incoming signal, allowing current flow only when the positive input terminal is at a higher potential than the negative input terminal.
  
-=== Hardware Setup: ===+==== Hardware Setup: ====
  
 Build the following breadboard circuit for the envelope detector circuit. Build the following breadboard circuit for the envelope detector circuit.
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 <WRAP centeralign>{{:university:courses:electronics:env_detector-wav2.png|}}</WRAP> <WRAP centeralign>{{:university:courses:electronics:env_detector-wav2.png|}}</WRAP>
  
-<WRAP centeralign> Figure 6. Generated AM signal </WRAP>+<WRAP centeralign> Figure 5. Positive half wave Envelope </WRAP>
  
 The obtained signal is the envelope of the positive half wave obtained previously. It is actually the 100 Hz message signal with some 10 KHz variations on it. The obtained signal is the envelope of the positive half wave obtained previously. It is actually the 100 Hz message signal with some 10 KHz variations on it.
 +
 +===== Extended Envelope Detector =====
 +
 +==== Background ====
 +
 +Consider the circuit presented in Figure 6.
 +
 +<WRAP centeralign>{{:university:courses:electronics:ext_env_detector-sch.png?500|}}</WRAP>
 +
 +<WRAP centeralign> Figure 6. Positive and negative Envelope Detector Circuit </WRAP>
 +
 +A similar circuit is added to the circuit in Figure 1 , the only difference being that the diode is reversed, allowing the negative voltages to pass through the RC circuit.
university/courses/electronics/electronics-lab-envelope-detector.txt · Last modified: 10 Mar 2021 17:35 by Cristina Suteu

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