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university:courses:electronics:electronics-lab-11m [13 Feb 2019 15:54]
amiclaus add Resources
university:courses:electronics:electronics-lab-11m [23 Aug 2019 13:06]
amiclaus
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-====== Activity ​11M. The Source follower (NMOS)======+====== ActivityThe Source follower (NMOS)======
  
 ===== Objective: ===== ===== Objective: =====
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 <WRAP centeralign>​ Figure 2 Source Follower Breadboard Circuit </​WRAP>​ <WRAP centeralign>​ Figure 2 Source Follower Breadboard Circuit </​WRAP>​
  
-The waveform generator should be configured for a 1 KHz Sine wave with 4 volt amplitude and 0 offset. The Single ended input of scope channel 2 (2+) is used to measure the voltage at the source. The Scope configured with channel 1+ connected to display the AWG generator output. When measuring the input to output error, channel 2 of the scope should be connected to display 2+ and 2- differential.+The waveform generator should be configured for a 1 KHz Sine wave with 4 volt amplitude ​peak-to-peak ​and 0 offset. The Single ended input of scope channel 2 (2+) is used to measure the voltage at the source. The Scope configured with channel 1+ connected to display the AWG generator output. When measuring the input to output error, channel 2 of the scope should be connected to display 2+ and 2- differential.
  
 ===== Procedure: ===== ===== Procedure: =====
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 <WRAP centeralign>​ Figure 8 Output Impedance Test Breadboard Circuit </​WRAP>​ <WRAP centeralign>​ Figure 8 Output Impedance Test Breadboard Circuit </​WRAP>​
  
-The waveform generator should be configured for a 1 KHz Sine wave with 2 volt amplitude with the offset set equal to minus the V<​sub>​GS</​sub>​ of M<​sub>​1</​sub>​ ( approximately -V ). This injects a +/- 0.1mA (1V/10KΩ) current into M<​sub>​1</​sub>'​s source. Scope input 2+ measures the change in voltage seen at the source.+The waveform generator should be configured for a 1 KHz Sine wave with 2 volt amplitude ​peak-to-peak ​with the offset set equal to minus the V<​sub>​GS</​sub>​ of M<​sub>​1</​sub>​ ( approximately -V ). This injects a +/- 0.1mA (1V/10KΩ) current into M<​sub>​1</​sub>'​s source. Scope input 2+ measures the change in voltage seen at the source.
  
 ===== Procedure: ===== ===== Procedure: =====
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 Plot the measured voltage amplitude seen at the source. The nominal source current in M<​sub>​1</​sub>​ is (Vn - V<​sub>​GS</​sub>​) / 4.7KΩ or 720uA. We can calculate r<​sub>​s</​sub>​from this current as ohms. How does this r<​sub>​s</​sub>​ compare to the from the test data? Change the value of R<​sub>​1</​sub>​ from 4.7 KΩ to 2.2 KΩ and re-measure the output impedance of the circuit. How has it changed and why? Plot the measured voltage amplitude seen at the source. The nominal source current in M<​sub>​1</​sub>​ is (Vn - V<​sub>​GS</​sub>​) / 4.7KΩ or 720uA. We can calculate r<​sub>​s</​sub>​from this current as ohms. How does this r<​sub>​s</​sub>​ compare to the from the test data? Change the value of R<​sub>​1</​sub>​ from 4.7 KΩ to 2.2 KΩ and re-measure the output impedance of the circuit. How has it changed and why?
  
 +<WRAP round download>​
 **Resources:​** **Resources:​**
   * Fritzing files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/​mos_source_follower_bb| mos_source_follower_bb]]   * Fritzing files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/​mos_source_follower_bb| mos_source_follower_bb]]
   * LTSpice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​ltspice/​mos_source_follower_ltspice | mos_source_follower_ltspice]]   * LTSpice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​ltspice/​mos_source_follower_ltspice | mos_source_follower_ltspice]]
 +</​WRAP>​
  
 **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-11m.txt · Last modified: 23 Aug 2019 13:06 by amiclaus