Wiki

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
Next revision Both sides next revision
university:courses:electronics:electronics-lab-9 [15 Feb 2019 16:49]
Antoniu Miclaus add ltspice files
university:courses:electronics:electronics-lab-9 [23 Aug 2019 13:05]
Antoniu Miclaus
Line 1: Line 1:
-====== Activity ​9.  ​Regulated Voltage Reference ======+====== Activity ​Regulated Voltage Reference ======
  
 ====== Version 1 ====== ====== Version 1 ======
Line 5: Line 5:
 ===== 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: =====
Line 29: Line 29:
 <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: =====
Line 66: Line 66:
 <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: =====
Line 88: Line 88:
 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:​** **Resources:​**
   * Fritzing files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/​regulated_voltage_reference_bb | regulated_voltage_reference_bb]]   * Fritzing files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/​regulated_voltage_reference_bb | regulated_voltage_reference_bb]]
   * LTspice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​ltspice/​regulated_voltage_reference_ltspice | regulated_voltage_reference_ltspice]]   * LTspice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​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.txt · Last modified: 05 Nov 2021 15:28 by Doug Mercer