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university:courses:electronics:electronics-lab-9 [25 Aug 2017 10:31]
Antoniu Miclaus add breadboard circuits + xy plots
university:courses:electronics:electronics-lab-9 [03 Jan 2021 22:21] (current)
Robin Getz fix links
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-====== Activity ​9.  ​Regulated Voltage Reference ======+====== Activity ​Regulated Voltage Reference ======
  
 ====== Version 1 ====== ====== Version 1 ======
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 ===== Objective: ===== ===== Objective: =====
  
-The zero gain amplifier (Q<​sub>​1</​sub>,​ R<​sub>​2</​sub>​) and stabilized current source (Q<​sub>​2</​sub>,​ R<​sub>​3</​sub>​) from activities ​and can be used in conjunction with a PNP current mirror stage (Q<​sub>​3</​sub>,​Q<​sub>​4</​sub>​) in negative feedback to build a circuit which provides a constant or regulated output voltage over a range of input voltages.+The zero gain amplifier (Q<​sub>​1</​sub>,​ R<​sub>​2</​sub>​) and stabilized current source (Q<​sub>​2</​sub>,​ R<​sub>​3</​sub>​) from activities ​10 and 11 can be used in conjunction with a PNP current mirror stage (Q<​sub>​3</​sub>,​Q<​sub>​4</​sub>​) in negative feedback to build a circuit which provides a constant or regulated output voltage over a range of input voltages.
  
 ===== Materials: ===== ===== Materials: =====
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 <WRAP centeralign>​ Figure 2 Regulator Version 1 Breadboard Circuit </​WRAP>​ <WRAP centeralign>​ Figure 2 Regulator Version 1 Breadboard Circuit </​WRAP>​
  
-Waveform generator 1 should be configured for a 1 KHz triangle wave with 4 volt amplitude and 2V offset. The Single ended input of scope channel 2 (2+) is used to measure the stabilized output voltage at the collector of Q<​sub>​4</​sub>​ ( negative inputs 1= and 2- should be connected to ground).+Waveform generator 1 should be configured for a 1 KHz triangle wave with 4 volt amplitude ​peak-to-peak ​and 2V offset. The Single ended input of scope channel 2 (2+) is used to measure the stabilized output voltage at the collector of Q<​sub>​4</​sub>​ ( negative inputs 1= and 2- should be connected to ground).
  
 ===== Procedure: ===== ===== Procedure: =====
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 <WRAP centeralign>​ Figure 5 Regulator Version 2 Breadboard Circuit</​WRAP>​ <WRAP centeralign>​ Figure 5 Regulator Version 2 Breadboard Circuit</​WRAP>​
  
-Waveform generator W1 should be configured for a 1 KHz triangle wave with 4 volt amplitude and 2V offset. Scope channel 2 (2+) is used to measure the stabilized output voltage at the emitter of Q<​sub>​4</​sub>​.+Waveform generator W1 should be configured for a 1 KHz triangle wave with 4 volt amplitude ​peak-to-peak ​and 2V offset. Scope channel 2 (2+) is used to measure the stabilized output voltage at the emitter of Q<​sub>​4</​sub>​.
  
 ===== Procedure: ===== ===== Procedure: =====
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 ==== For Further Study: ==== ==== For Further Study: ====
  
-ADI Mini Tutorial on [[http://​www.analog.com/​static/​imported-files/​tutorials/​MT-087.pdf|Voltage references]]+ADI Mini Tutorial on [[adi>static/​imported-files/​tutorials/​MT-087.pdf|Voltage references]]
  
 ====== Using an NPN transistor array: ====== ====== Using an NPN transistor array: ======
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 All the emitters can be tired to ground ( pins 3,7,10,13 ). Devices Q<​sub>​1</​sub>,​ Q<​sub>​2</​sub>​ and Q<​sub>​3</​sub>​ can be connected in parallel and serve as Q<​sub>​2</​sub>​ in figure 2. Q<​sub>​4</​sub>​ and Q<​sub>​5</​sub>​can be used for Q<​sub>​1</​sub>​ and Q<​sub>​3</​sub>​in figure 2. An individual device such as a 2N3904 etc. can be used for Q<​sub>​4</​sub>​ in figure 2. The 3 to 1 emitter area ratio will result in an output voltage very nearly 1.2 volts if R<​sub>​1</​sub>​ and R<​sub>​3</​sub>​ are both equal to 2KΩ (when R<​sub>​2</​sub>​ is 100Ω). All the emitters can be tired to ground ( pins 3,7,10,13 ). Devices Q<​sub>​1</​sub>,​ Q<​sub>​2</​sub>​ and Q<​sub>​3</​sub>​ can be connected in parallel and serve as Q<​sub>​2</​sub>​ in figure 2. Q<​sub>​4</​sub>​ and Q<​sub>​5</​sub>​can be used for Q<​sub>​1</​sub>​ and Q<​sub>​3</​sub>​in figure 2. An individual device such as a 2N3904 etc. can be used for Q<​sub>​4</​sub>​ in figure 2. The 3 to 1 emitter area ratio will result in an output voltage very nearly 1.2 volts if R<​sub>​1</​sub>​ and R<​sub>​3</​sub>​ are both equal to 2KΩ (when R<​sub>​2</​sub>​ is 100Ω).
 +
 +<WRAP round download>​
 +**Resources:​**
 +  * Fritzing files: [[downgit>​education_tools/​tree/​master/​m2k/​fritzing/​regulated_voltage_reference_bb | regulated_voltage_reference_bb]]
 +  * LTspice files: [[downgit>​education_tools/​tree/​master/​m2k/​ltspice/​regulated_voltage_reference_ltspice | regulated_voltage_reference_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-9.1503649874.txt.gz · Last modified: 25 Aug 2017 10:31 by Antoniu Miclaus