The input impedance of a non-inverting configuration is significantly higher. That is an important consideration when the signal to be amplified or buffered is relatively small. The trade-off, however, is that the non-inverting configuration tends to be less stable around zero than the inverting configuration. If you are working with AC signals it may not add significantly to your error budget but if you are designing DC control then you may want to account for this, depending on your budget and application. The inverting configuration is usually more desireable in precision applications. Non-inverting is good for things like video applications, etc. Non-inverting buffers, such as the old LM310, for example, have a very high open loop gain to help stabalize the near-zero operation. The open loop gain is much higher than for a typical op-amp. If you are going to work with DC near zero, you may want high open loop gain devices when designing a non-inverting circuit. ----- Original Message ----- From: "Luis Moreira" To: Sent: Friday, June 11, 2004 6:07 AM Subject: [EE] OPAMP use > Hi Guys > For years I been using the inverting OPAMP circuit when amplifying a signal, > by using two stages to get the signal in the right phase. But Now someone > that works with me just designed a circuit with a non inverting OPAMP > configuration, and apart form the fact the gain can not be lower than 2 I > can not see any problems with using this configuration. in top of it all I > only need one OPAMP not two. > I read a few things about it and it seems that the non inverting > configuration puts more strain on the OPAMP... > Do any of you have any info on this and any other problems that could arise > by using this configuration over the inverting one. > best regards > Luis > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics