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university:courses:electronics:electronics-lab-variable-gain-amplifier [05 Mar 2019 12:58]
Antoniu Miclaus [Further Reading]
university:courses:electronics:electronics-lab-variable-gain-amplifier [03 Jan 2021 22:21]
Robin Getz fix links
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 Consider the circuit schematic presented in Figure 1. Consider the circuit schematic presented in Figure 1.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_crl-sch.png|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​vctrl_amp_transistor.png|}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 1. Voltage control using transistor </​WRAP>​ <WRAP centeralign>​ Figure 1. Voltage control using transistor </​WRAP>​
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator as source Vin to provide a 2V amplitude, 1 kHz sine wave excitation to the circuit. Use the second waveform generator for controlling the transistor, providing a 2V amplitude, 1Hz square wave excitation. Supply the op amp to +/- 5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2.+Use the first waveform generator as source Vin to provide a 2V amplitude ​peak-to-peak, 1 kHz sine wave excitation to the circuit. Use the second waveform generator for controlling the transistor, providing a 2V amplitude, 1Hz square wave excitation. Supply the op amp to +/- 5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2.
  
 An animated plot is presented in Figure 3. An animated plot is presented in Figure 3.
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 Consider the circuit schematic presented in Figure 4. Consider the circuit schematic presented in Figure 4.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot2-sch.png?500|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​var_g_invert_amp_pot.png|}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 4. Variable Gain Inverting Amplifier using potetiometer </​WRAP>​ <WRAP centeralign>​ Figure 4. Variable Gain Inverting Amplifier using potetiometer </​WRAP>​
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator as source Vin to provide a 2V amplitude, 1 kHz sine wave excitation to the circuit. ​ Supply the op amp to +/- 5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2.+Use the first waveform generator as source Vin to provide a 2V amplitude ​peak-to-peak, 1 kHz sine wave excitation to the circuit. ​ Supply the op amp to +/- 5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2.
  
 By varying the value of the potentiometer,​ an animated plot is presented in Figure 6. By varying the value of the potentiometer,​ an animated plot is presented in Figure 6.
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 Consider the circuit schematic presented in Figure 7. Consider the circuit schematic presented in Figure 7.
  
-<WRAP centeralign>​ {{:​university:​courses:​electronics:​var_gain_amp_pot-sch.png?500|}} </​WRAP>​+<WRAP centeralign>​ {{ :​university:​courses:​electronics:​var_gain_inv_noninv.png|}} </​WRAP>​
  
 <WRAP centeralign>​ Figure 7. Variable Gain Inverting/​Non-Inverting Amplifier using potetiometer </​WRAP>​ <WRAP centeralign>​ Figure 7. Variable Gain Inverting/​Non-Inverting Amplifier using potetiometer </​WRAP>​
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 ==== Procedure ==== ==== Procedure ====
  
-Use the first waveform generator as source Vin to provide a 2V amplitude, 1 kHz sine wave excitation to the circuit. ​ Supply the op amp to +/- 5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2.+Use the first waveform generator as source Vin to provide a 2V amplitude ​peak-to-peak, 1 kHz sine wave excitation to the circuit. ​ Supply the op amp to +/- 5V from the power supply. Configure the scope so that the input signal is displayed on channel 1 and the output signal is displayed on channel 2.
  
 By varying the value of the potentiometer,​ an animated plot is presented in Figure 9. By varying the value of the potentiometer,​ an animated plot is presented in Figure 9.
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 <WRAP round download>​ <WRAP round download>​
 **Lab Resources:​** **Lab Resources:​**
-  * Fritzing files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/​var_gain_amp_bb | var_gain_amp_bb]] +  * Fritzing files: [[downgit>education_tools/​tree/​master/​m2k/​fritzing/​var_gain_amp_bb | var_gain_amp_bb]] 
-  * LTspice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​ltspice/​var_gain_amp_ltspice | var_gain_amp_ltspice]]+  * LTspice files: [[downgit>education_tools/​tree/​master/​m2k/​ltspice/​var_gain_amp_ltspice | var_gain_amp_ltspice]]
 </​WRAP>​ </​WRAP>​
  
 Some additional resources: Some additional resources:
-  * [[http://​www.analog.com/​en/​analog-dialogue/​articles/​x-amp-45-db-500-mhz-variable-gain-amplifier.html|X-Amp™,​ A New 45-dB, 500-MHz Variable-Gain Amplifier (VGA) Simplifies Adaptive Receiver Designs]] +  * [[adi>en/​analog-dialogue/​articles/​x-amp-45-db-500-mhz-variable-gain-amplifier.html|X-Amp™,​ A New 45-dB, 500-MHz Variable-Gain Amplifier (VGA) Simplifies Adaptive Receiver Designs]] 
-  * [[http://​www.analog.com/​en/​analog-dialogue/​articles/​reinvent-the-signal-generator.html|Two New Devices Help Reinvent the Signal Generator]]+  * [[adi>en/​analog-dialogue/​articles/​reinvent-the-signal-generator.html|Two New Devices Help Reinvent the Signal Generator]]
  
 **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-variable-gain-amplifier.txt · Last modified: 03 Jan 2021 22:21 by Robin Getz