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university:courses:electronics:electronics-lab-13a [07 Dec 2018 13:22]
Antoniu Miclaus add Fritzing files
university:courses:electronics:electronics-lab-13a [27 Jan 2021 22:36]
Robin Getz use wp> interwiki links
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-====== Activity ​13A. Amplifier Output Stages ======+====== ActivityAmplifier Output Stages ======
  
 ===== Objective: ===== ===== Objective: =====
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 ===== Procedure: ===== ===== Procedure: =====
-The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak amplitude ​and 0 offset. Using scope channel 1 to observe the input at W1 and scope channel 2 to observe the output of the amplifier at R<​sub>​L</​sub>​.+The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak-to-peak ​and 0 offset. Using scope channel 1 to observe the input at W1 and scope channel 2 to observe the output of the amplifier at R<​sub>​L</​sub>​.
 {{ :​university:​courses:​electronics:​a13a_f3_wf.png?​ |}} {{ :​university:​courses:​electronics:​a13a_f3_wf.png?​ |}}
  
 <WRAP centeralign>​ Figure 3 Push - Pull Output stage Waveforms </​WRAP>​ <WRAP centeralign>​ Figure 3 Push - Pull Output stage Waveforms </​WRAP>​
  
-Next, apply power and adjust the waveform generator so that W1 is a 100 Hz triangle wave with 0V offset and 3.0 V amplitude ​values. Use the oscilloscope in the x-y mode to observe the voltage-transfer curve of the circuit. ​+Next, apply power and adjust the waveform generator so that W1 is a 100 Hz triangle wave with 0V offset and 3.0 V amplitude ​peak-to-peak. Use the oscilloscope in the x-y mode to observe the voltage-transfer curve of the circuit. ​
  
 {{ :​university:​courses:​electronics:​a13a_f4_tc.png?​400 |}} {{ :​university:​courses:​electronics:​a13a_f4_tc.png?​400 |}}
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 • Starting with the amplitude = 0 V, gradually increase it until you just begin to see a signal on scope channel 2 appear at the output. For what range of amplitude values of W1 can we say that both BJT's are essentially off? Confirm this by observing the voltages of the current-sensing resistances R<​sub>​1</​sub>​ and R<​sub>​2</​sub>​. • Starting with the amplitude = 0 V, gradually increase it until you just begin to see a signal on scope channel 2 appear at the output. For what range of amplitude values of W1 can we say that both BJT's are essentially off? Confirm this by observing the voltages of the current-sensing resistances R<​sub>​1</​sub>​ and R<​sub>​2</​sub>​.
  
-• Raise W1 to 6.0V amplitude value, and record the amplitude of the output waveform as well as the collector currents of the BJTs, which can be found via Ohm's law from the voltages across R<​sub>​1</​sub>​ and R<​sub>​2</​sub>,​ and justify your findings in terms of circuit operation and the given component values.+• Raise W1 to 6.0V amplitude ​peak-to-peak ​value, and record the amplitude of the output waveform as well as the collector currents of the BJTs, which can be found via Ohm's law from the voltages across R<​sub>​1</​sub>​ and R<​sub>​2</​sub>,​ and justify your findings in terms of circuit operation and the given component values.
  
-• Repeat, but with W1 raised a 10.0V amplitude value; and comment.+• Repeat, but with W1 raised a 10.0V amplitude ​peak-to-peak ​value; and comment.
  
 Simulate the circuit of figure 1 using QUCS, compare with your lab findings, and justify any differences. Simulate the circuit of figure 1 using QUCS, compare with your lab findings, and justify any differences.
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 ===== Procedure: ===== ===== Procedure: =====
-The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak amplitude ​and 0 offset. Using scope channel 1 to observe the input at W1 and scope channel 2 to observe the output of the amplifier at R<​sub>​L</​sub>​.+The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak-to-peak ​and 0 offset. Using scope channel 1 to observe the input at W1 and scope channel 2 to observe the output of the amplifier at R<​sub>​L</​sub>​.
 {{ :​university:​courses:​electronics:​a13a_f7_wf.png?​ |}} {{ :​university:​courses:​electronics:​a13a_f7_wf.png?​ |}}
  
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 ===== Procedure: ===== ===== Procedure: =====
-The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak amplitude ​and 0 offset. Using scope channel 1 to observe the input at W1 and scope channel 2 to observe the output of the amplifier at R<​sub>​L</​sub>​.+The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak-to-peak ​and 0 offset. Using scope channel 1 to observe the input at W1 and scope channel 2 to observe the output of the amplifier at R<​sub>​L</​sub>​.
 {{ :​university:​courses:​electronics:​a13a_f10_wf.png?​ |}} {{ :​university:​courses:​electronics:​a13a_f10_wf.png?​ |}}
  
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 ** Lab Resources:​** ** Lab Resources:​**
-  * LTSpice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​ltspice/​amp_out_stg_ltspice | amp_out_stage_ltspice]]+  * LTSpice files: [[downgit>education_tools/​tree/​master/​m2k/​ltspice/​amp_out_stg_ltspice | amp_out_stage_ltspice]]
  
  
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 Simulate the circuit of figure 3 using LTSpice or ADIsimPE, compare with your lab findings, and justify any differences. Simulate the circuit of figure 3 using LTSpice or ADIsimPE, compare with your lab findings, and justify any differences.
  
 +<WRAP round download>​
 **Resources:​** **Resources:​**
-  * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/output-stages ​output_stages]] +  * Fritzing files: [[downgit>​education_tools/tree/master/m2k/fritzing/output-stages | output_stages]] 
 +  * LTspice files[[downgit>​education_tools/​tree/​master/​m2k/​ltspice/output_stages_ltspice ​output_stages_ltspice ​]] 
 +</​WRAP>​
 ==== For Further reading: ==== ==== For Further reading: ====
-Output Stages [[http://​www.analog.com/​static/​imported-files/​tutorials/​MT-207.pdf|(MT-207)]]\\ +Output Stages [[adi>static/​imported-files/​tutorials/​MT-207.pdf|(MT-207)]]\\ 
-[[http://​en.wikipedia.org/​wiki/​Push-pull_output|Push-Pull Outputs]]+[[wp>Push-pull_output|Push-Pull Outputs]] 
 + 
  
 **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-13a.txt · Last modified: 27 Jan 2021 22:36 by Robin Getz