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venkyelectrical
Asked: 2022-01-04T15:05:19+00:00 In:

2.29 An inverting amplifier is accidentally connected with positive feedback as illustrated in Fig. P2.29. Assuming the op amp has a finite gain A, find an expression for the closed-loop gain, vO/vI. Show that if A = 1 + (R2/R1), the closed-loop gain becomes infinite, indicating instability. Real op-amp gain varies with input frequency so that instability is practically inevitable when positive feedback is used.

2.29 An inverting amplifier is accidentally connected with positive feedback as illustrated in Fig. P2.29. Assuming the op amp has a finite gain A, find an expression for the closed-loop gain, vO/vI. Show that if A = 1 + (R2/R1), the closed-loop gain becomes infinite, indicating instability. Real op-amp gain varies with input frequency so that instability is practically inevitable when positive feedback is used.

 

2.29 An inverting amplifier is accidentally connected with positive feedback as illustrated in Fig. P2.29. Assuming the op amp has a finite gain A, find an expression for the closed-loop gain, vO/vI. Show that if A = 1 + (R2/R1), the closed-loop gain becomes infinite, indicating instability. Real op-amp gain varies with input frequency so that instability is practically inevitable when positive feedback is used.

microelectronics by sedra and smith 8th edition chapter 2
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