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university:courses:electronics:electronics-lab-5m [24 Jul 2017 15:17] – change amplitude value to peak-peak Antoniu Miclausuniversity:courses:electronics:electronics-lab-5m [15 Nov 2018 10:10] – [Questions:] add Fritzing files Antoniu Miclaus
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 The waveform generator W1 should be configured for a 1 KHz Sine wave with 3 volt amplitude and 0 volt offset. The setup should be configured with scope channel 1+ connected to display the output W1. Scope channel 2 (2+) is used to measure alternately the waveform at the gate and drain of M<sub>1</sub>. The waveform generator W1 should be configured for a 1 KHz Sine wave with 3 volt amplitude and 0 volt offset. The setup should be configured with scope channel 1+ connected to display the output W1. Scope channel 2 (2+) is used to measure alternately the waveform at the gate and drain of M<sub>1</sub>.
 +{{ :university:courses:electronics:a5m_nf2.png? |}}
 +
 +<WRAP centeralign> Figure 2 Common source amplifier test configuration breadboard connection </WRAP>
  
 ===== Procedure: ===== ===== Procedure: =====
 +{{ :university:courses:electronics:a5m_nf3.png?500 |}}
 +
 +<WRAP centeralign> Figure 3 Common source amplifier test circuit, Scopy plot</WRAP>
  
 The voltage gain, A, of the common source amplifier can be expressed as the ratio of load resistor R<sub>L</sub> to the small signal source resistance r<sub>s</sub>. The transconductance, g<sub>m</sub>, of the transistor is a function of the drain current I<sub>D</sub> and the so called gate overdrive voltage, V<sub>GS</sub>-V<sub>th</sub> where V<sub>th</sub> is the threshold voltage. The voltage gain, A, of the common source amplifier can be expressed as the ratio of load resistor R<sub>L</sub> to the small signal source resistance r<sub>s</sub>. The transconductance, g<sub>m</sub>, of the transistor is a function of the drain current I<sub>D</sub> and the so called gate overdrive voltage, V<sub>GS</sub>-V<sub>th</sub> where V<sub>th</sub> is the threshold voltage.
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 {{:university:courses:electronics:a5m_e2.png?100|}} (2) {{:university:courses:electronics:a5m_e2.png?100|}} (2)
- 
-====== Self-biased configuration with negative feedback ====== 
- 
-{{ :university:courses:electronics:a5m_f3.png?500 |}} 
- 
-<WRAP centeralign> Figure 3 Self Biased configuration </WRAP> 
- 
-===== Questions: ===== 
- 
-How does adding negative feedback help to stabilize the DC operating point? 
  
 ====== Adding source degeneration ====== ====== Adding source degeneration ======
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 <WRAP centeralign> Figure 4 Source degeneration added </WRAP> <WRAP centeralign> Figure 4 Source degeneration added </WRAP>
 +
 +=====Hardware Setup =====
 +{{ :university:courses:electronics:a5m_nf5.png? |}}
 +
 +<WRAP centeralign> Figure 5 Source degeneration added, breadboard connection </WRAP>
 +===== Procedure: =====
 +{{ :university:courses:electronics:a5m_nf6.png?500 |}}
 +
 +<WRAP centeralign> Figure 6 Source degeneration added, Scopy plot </WRAP>
  
 ===== Questions: ===== ===== Questions: =====
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 ====== Increasing AC gain of source degenerated amplifier ====== ====== Increasing AC gain of source degenerated amplifier ======
  
-Adding the source degeneration resistor has improved the stability of the DC operating point at the cost decreased amplifier gain. A higher gain for AC signals can be restored to some extent by adding capacitor C<sub>2</sub>across the degeneration resistor R<sub>S</sub> as shown in figure 5.+Adding the source degeneration resistor has improved the stability of the DC operating point at the cost decreased amplifier gain. A higher gain for AC signals can be restored to some extent by adding capacitor C<sub>2</sub>across the degeneration resistor R<sub>S</sub> as shown in figure 4.
  
 {{ :university:courses:electronics:a5m_f5.png?500 |}} {{ :university:courses:electronics:a5m_f5.png?500 |}}
  
-<WRAP centeralign> Figure 5 C<sub>2</sub> added to increase AC gain </WRAP>+<WRAP centeralign> Figure 7 C<sub>2</sub> added to increase AC gain </WRAP> 
 +=====Hardware Setup ===== 
 +{{ :university:courses:electronics:a5m_nf8.png? |}} 
 + 
 +<WRAP centeralign> Figure 8 C<sub>2</sub> added, breadboard connection </WRAP> 
 +===== Procedure: ===== 
 +{{ :university:courses:electronics:a5m_nf9.png?500 |}} 
 + 
 +<WRAP centeralign> Figure 9 C<sub>2</sub> added, Scopy plot</WRAP> 
 +====== Self-biased configuration with negative feedback ====== 
 + 
 +{{ :university:courses:electronics:a5m_f3.png?500 |}} 
 + 
 +<WRAP centeralign> Figure 10 Self Biased configuration </WRAP> 
 + 
 +=====Hardware Setup ===== 
 +{{ :university:courses:electronics:a5m_nf11.png? |}} 
 + 
 +<WRAP centeralign> Figure 11 Self Biased configuration, breadboard connection </WRAP> 
 +===== Procedure: ===== 
 +{{ :university:courses:electronics:a5m_nf12.png?500 |}} 
 + 
 +<WRAP centeralign> Figure 12 Self Biased configuration, Scopy plot</WRAP> 
 +===== Questions: ===== 
 + 
 +How does adding negative feedback help to stabilize the DC operating point? 
 + 
 +**Resources:** 
 +  * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/comm_source_amp_bb | comm_source_amp_bb]]
  
 ==== References for further reading: ==== ==== References for further reading: ====
university/courses/electronics/electronics-lab-5m.txt · Last modified: 25 Jun 2020 22:07 by 127.0.0.1

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