| Author |
Message |
WTech
Joined: 03 Nov 2009
Posts: 3
Location: Paksitan
|
 04 Nov 2009 11:30 Can op-amp be used with one terminal open? |
|
|
|
|
Greetings guys
I have a problem with a circuit I am working on, there on the schematic the op-amp has its inverting input pin open. The non-inverting input is connected though. Can it be used this way? What can be the expected working of the op-amp in this configuration?
|
|
| Back to top |
|
 |
LvW
Joined: 07 May 2008
Posts: 1466
Helped: 242
Location: Germany
|
04 Nov 2009 12:00 Re: Can op-amp be used with one terminal open? |
|
|
|
|
| I am afraid - pure garbage!
|
|
| Back to top |
|
|
flatulent
Joined: 19 Jul 2002
Posts: 4877
Helped: 324
Location: Middle Earth
|
04 Nov 2009 16:31 Re: Can op-amp be used with one terminal open? |
|
|
|
|
| The output will go to one of the supply rails and not be affected by the input on the other pin.
|
|
| Back to top |
|
|
Google
AdSense
|
04 Nov 2009 16:31 Ads |
|
|
|
|
|
|
| Back to top |
|
|
LvW
Joined: 07 May 2008
Posts: 1466
Helped: 242
Location: Germany
|
04 Nov 2009 18:25 Re: Can op-amp be used with one terminal open? |
|
|
|
|
Hi WTech,
I suppose you are pretty new in the analog field and my first answer ("garbage") didn`t help too much.
Therefore: The input stage of each opamp is a differential stage consisting of a pair of transistors which interact in a certain way. Therefore, there is no suitable operating point for transistor A if transistor B is "dead". Perhaps you know that a transistor is a three-pole device (handled as a 4-pole device) which needs a bias current into the base pin.
Regards
|
|
| Back to top |
|
|
