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university:courses:electronics:electronics-lab-7m [14 Dec 2012 21:31]
Doug Mercer [Questions:]
university:courses:electronics:electronics-lab-7m [25 Jun 2020 22:07] (current)
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-====== Activity ​7M. Zero gain amplifier (MOS) ======+====== ActivityZero gain amplifier (MOS) ======
  
 ===== Objective: ===== ===== Objective: =====
Line 8: Line 8:
 ===== Materials :===== ===== Materials :=====
  
-Analog Discovery Lab hardware\\+ADALM2000 Active Learning Module\\
 Solder-less breadboard\\ Solder-less breadboard\\
 1 - 2.2KΩ Resistor (or any similar value)\\ 1 - 2.2KΩ Resistor (or any similar value)\\
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 ===== Hardware Setup: ===== ===== Hardware Setup: =====
  
-The waveform generator 1 should be configured for a 1 KHz triangle wave with volt amplitude and 2V offset. Connect scope Channel 1 to display output W1 of the AWG generator. The Single ended input of scope channel 2 (2+) is used to measure alternately the gate and drain voltage of M<​sub>​1</​sub>​.+{{:​university:​courses:​electronics:​nmos_zero_gain-bb.png|}} 
 + 
 +<WRAP centeralign>​ Figure 2 NMOS Zero Gain Amplifier Breadboard Circuit </​WRAP>​ 
 + 
 +The waveform generator 1 should be configured for a 1 KHz triangle wave with volt amplitude ​peak-to-peak ​and 2V offset. Connect scope Channel 1 to display output W1 of the AWG generator. The Single ended input of scope channel 2 (2+) is used to measure alternately the gate and drain voltage of M<​sub>​1</​sub>​.
  
 ===== Procedure: ===== ===== Procedure: =====
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 In the figure below we have a transistor biased into saturation region with a drain voltage which is less than the gate voltage by , (equal to I<​sub>​D</​sub>​ times 50 ohms) and is essentially constant with input voltage changes applied from the waveform generator. In the figure below we have a transistor biased into saturation region with a drain voltage which is less than the gate voltage by , (equal to I<​sub>​D</​sub>​ times 50 ohms) and is essentially constant with input voltage changes applied from the waveform generator.
  
-{{ :​university:​courses:​electronics:​a7m_f2.png?500 |}}+<WRAP centeralign>​{{:​university:​courses:​electronics:​nmos_zero_gain_vds-wav.png?500|}}</​WRAP>​
  
-<WRAP centeralign>​ Figure ​2 Plot comparing V<​sub>​gate</​sub>​ and V<​sub>​drain</​sub>​ </​WRAP>​+<WRAP centeralign>​ Figure ​V<​sub>​drain</​sub> ​Plot </​WRAP>​
  
-<WRAP centeralign>​ Figure ​V<​sub>​GS</​sub> ​and V<​sub>​DS</​sub> ​vs. drain current ​</​WRAP>​+<WRAP centeralign>​{{:​university:​courses:​electronics:​nmos_zero_gain_vgs-wav.png?​500|}}</​WRAP>​ 
 + 
 +<WRAP centeralign>​ Figure ​V<​sub>​gate</​sub> ​Plot </​WRAP>​ 
 + 
 +{{ :​university:​courses:​electronics:​a7m_f2.png?​500 |}} 
 + 
 +<WRAP centeralign>​ Figure 5 Plot comparing ​V<​sub>​gate</​sub> ​and V<​sub>​drain</​sub> ​</​WRAP>​
  
 ===== Questions: ===== ===== Questions: =====
  
 What are the relative gains of the two paths when the drain current is less than and greater than the "​ideal"​ zero gain value? What are the relative gains of the two paths when the drain current is less than and greater than the "​ideal"​ zero gain value?
 +
 +<WRAP round download>​
 +**Resources:​**
 +  * Fritzing files: [[downgit>​education_tools/​tree/​master/​m2k/​fritzing/​mos_zero_gain_amp_bb | mos_zero_gain_amp_bb]]
 +  * LTspice files: [[downgit>​education_tools/​tree/​master/​m2k/​ltspice/​mos_zero_gain_amp_ltspice| mos_zero_gain_amp_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-7m.1355517116.txt.gz · Last modified: 14 Dec 2012 21:31 by Doug Mercer