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university:courses:electronics:electronics-lab-21 [23 Mar 2017 16:34]
dmercer [Materials:]
university:courses:electronics:electronics-lab-21 [12 Jul 2019 14:01]
andreeapop
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-====== Activity ​21. CMOS LC Oscillator ======+====== ActivityCMOS LC Oscillator ======
  
 ===== Objective: ===== ===== Objective: =====
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 The goal is to explore the use of the high gain inverting CMOS amplifier in a LC oscillator. The goal is to explore the use of the high gain inverting CMOS amplifier in a LC oscillator.
  
-====== ​21.1 High gain inverting amplifier ======+====== High gain inverting amplifier ======
  
 ===== Materials: ===== ===== Materials: =====
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 ===== Directions: ===== ===== Directions: =====
  
-First build the simple example shown figure 2 to test the input to output transfer function of the simple CMOS amplifier. The green boxes indicate connections to the connector on Analog Discovery. Connect Vp (+5V) power to V<​sub>​CC</​sub>​ (pin 14) and ground to GND (pin 7). Connect the output of the waveform generator to one of the inverter inputs (pin 1) along with scope input 1+ and connect the inverter output (pin 2) to scope input 2+. +First build the simple example shown figure 2 to test the input to output transfer function of the simple CMOS amplifier. The green boxes indicate connections to the connector on The ADALM2000. Connect Vp (+5V) power to V<​sub>​CC</​sub>​ (pin 14) and ground to GND (pin 7). Connect the output of the waveform generator to one of the inverter inputs (pin 1) along with scope input 1+ and connect the inverter output (pin 2) to scope input 2+. 
  
 {{ :​university:​courses:​electronics:​a20_f2.png?​500 |}} {{ :​university:​courses:​electronics:​a20_f2.png?​500 |}}
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 ===== Hardware Setup: ===== ===== Hardware Setup: =====
  
-Configure the waveform generator for a 1 KHz triangle wave with 2V amplitude and 2.5V offset. Both scope channels should be set to 1V/Div.+Configure the waveform generator for a 1 KHz triangle wave with 4V amplitude and 2.5V offset. Both scope channels should be set to 1V/Div.
  
 ===== Procedure: ===== ===== Procedure: =====
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 Measure the slope of the output and calculate the DC gain of the amplifier as the ratio of the change in the output voltage to the change in input voltage at the center of the output swing (i.e. around 2.5V). Remember this should be a negative number because the amplifier inverts. Measure the slope of the output and calculate the DC gain of the amplifier as the ratio of the change in the output voltage to the change in input voltage at the center of the output swing (i.e. around 2.5V). Remember this should be a negative number because the amplifier inverts.
  
-====== ​21.2 Adding LC resonator ======+====== Adding LC resonator ======
  
 On your solder-less breadboard construct the filter network shown in figure 4 below. Using the Network (Bode) analyzer tool measure the gain and phase response of the LC network. On your solder-less breadboard construct the filter network shown in figure 4 below. Using the Network (Bode) analyzer tool measure the gain and phase response of the LC network.
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 ===== Hardware Setup: ===== ===== Hardware Setup: =====
  
-Configure the Network (Bode) analyzer for 2 log decades, end frequency of 100 KHz, a max gain of 2X, run time of 10 sec, offset of 0 V and an amplitude of V. Run a single sweep and save the data to a file.+Configure the Network (Bode) analyzer for 2 log decades, end frequency of 100 KHz, a max gain of 2X, run time of 10 sec, offset of 0 V and an amplitude of V. Run a single sweep and save the data to a file.
  
 =====Question:​ ===== =====Question:​ =====
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 Based on the frequency response of the LC network, at what frequency do you think the circuit will oscillate? Based on the frequency response of the LC network, at what frequency do you think the circuit will oscillate?
  
-====== ​21.3 Placing LC network in feedback of amplifier ======+====== Placing LC network in feedback of amplifier ======
  
 {{ :​university:​courses:​electronics:​a21_f5.png?​500 |}} {{ :​university:​courses:​electronics:​a21_f5.png?​500 |}}
university/courses/electronics/electronics-lab-21.txt · Last modified: 23 Aug 2019 13:58 by amiclaus