Home Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Opamp feedback question

After going through the LM 3875 application notes and reviewing some basic circuit theory, the open loop gain of the theoretical op amp is infinite as the voltage on the + and - inputs are the same. However, in a real world situation, the LM 3875 has an open loop gain of around 100 dB. If the closed loop gain (with feedback) is 30 dB, then does that mean that the negative feedback is 70 db?



This post is made possible by the generous support of people like you and our sponsors:
  McShane Design  


Topic - Opamp feedback question - bilbobaggins 18:53:18 03/15/03 (3)


You can not post to an archived thread.