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university:courses:electronics:text:chapter-3 [06 Jun 2017 16:47]
_deletedUser0_ [3.2.4 Frequency Dependence of Loop Gain]
university:courses:electronics:text:chapter-3 [06 Jun 2017 16:49] (current)
_deletedUser0_ [3.2.3 Loop gain]
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 This loop gain discussion emphasizes that indeed, loop gain is a very significant factor in predicting the performance of closed-loop operational amplifier circuits. The open-loop gain required to obtain an adequate amount of loop gain will, of course, depend on the desired closed-loop gain.  ​ This loop gain discussion emphasizes that indeed, loop gain is a very significant factor in predicting the performance of closed-loop operational amplifier circuits. The open-loop gain required to obtain an adequate amount of loop gain will, of course, depend on the desired closed-loop gain.  ​
    
-For example, using equation 3-9, an amplifier with A<​sub>​VOL</​sub>​ = 20,000 will have an A<​sub>​VOL</​sub>​β ~ 2000 for a closed-loop gain of 10, but the loop gain will be only 20 for a closed-loop ​ gain of 1000. The first situation implies an amplifier-related gain error the order of ~ 0.05%, while the second would result in about 5% of error. Obviously, the higher the required gain, the greater will be the required open-loop gain to support an A<​sub>​VOL</​sub>​β for a given accuracy. ​ +For example, using equation 3-9, an amplifier with A<​sub>​VOL</​sub>​ = 20,000 will have an A<​sub>​VOL</​sub>​β ~ 2000 for a closed-loop gain of 10, but the loop gain will be only 20 for a closed-loop ​ gain of 1000. The first situation implies an amplifier-related gain error the order of ~ 0.05%, while the second would result in about 5% of error. Obviously, the higher the required gain, the greater will be the required open-loop gain to support an A<​sub>​VOL</​sub>​β for a given accuracy. ​ 
 + 
 +**ADALM1000 Lab Activity [[university:​courses:​alm1k:​alm-lab-olg|Open Loop Gain]]** ​
  
 ====3.2.4 Frequency Dependence of Loop Gain ==== ====3.2.4 Frequency Dependence of Loop Gain ====
university/courses/electronics/text/chapter-3.txt · Last modified: 06 Jun 2017 16:49 by _deletedUser0_