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OpAmp Electrical Engr/Electrophysics Help  
User currently offlineAirxLiban From Lebanon, joined Oct 2003, 4506 posts, RR: 54
Posted (9 years 4 months 2 weeks 6 days 16 hours ago) and read 783 times:

Could someone kindly explain the following (and I realize this may be obscenely obvious for some):

What is A_0OL, the dc open-loop gain of the amplifier...what does that mean?

What do open-loop and closed-loop refer to?


PARIS, FRANCE...THE BEIRUT OF EUROPE.
6 replies: All unread, jump to last
 
User currently offlineSprout5199 From United States of America, joined Feb 2005, 1851 posts, RR: 2
Reply 1, posted (9 years 4 months 2 weeks 6 days 15 hours ago) and read 772 times:

IIRC this has to do with neg. feedback to keep the amp. linear.(been a long time since I have used any theory)

Dan in Jupiter


User currently offlineAirxLiban From Lebanon, joined Oct 2003, 4506 posts, RR: 54
Reply 2, posted (9 years 4 months 2 weeks 6 days ago) and read 759 times:

what does IIRC mean again?


PARIS, FRANCE...THE BEIRUT OF EUROPE.
User currently onlineKlaus From Germany, joined Jul 2001, 21406 posts, RR: 54
Reply 3, posted (9 years 4 months 2 weeks 6 days ago) and read 758 times:

I´m not a specialist for analog electronics, but as far as I understand the "open loop gain" should be the direct amplification factor without any positive (higher gain) or negative feedback (lower gain) in the "closed loop" case.

User currently offlineIakobos From Belgium, joined Aug 2003, 3312 posts, RR: 35
Reply 4, posted (9 years 4 months 2 weeks 6 days ago) and read 753 times:

Open loop: no load, theoritical gain of a circuit (all by itself).

User currently onlineKlaus From Germany, joined Jul 2001, 21406 posts, RR: 54
Reply 5, posted (9 years 4 months 2 weeks 5 days 23 hours ago) and read 748 times:

No, it seems this Tutorial agrees with my assumption:


By introducing negative feedback around an op-amp we can control the gain of an amplifier circuit. The resulting gain is called the closed loop gain


User currently offlineGkirk From UK - Scotland, joined Jun 2000, 24906 posts, RR: 56
Reply 6, posted (9 years 4 months 2 weeks 5 days 22 hours ago) and read 745 times:

I'll reply with a proper answer when I can find my Physics books  Wink


When you hear the noise of the Tartan Army Boys, we'll be coming down the road!
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