| Electronics > Beginners |
| Op amp gain and number of stages |
| (1/4) > >> |
| ZeroResistance:
Is there any general rule for max op-amp gain that a single stage should be set too. Is a gain of 100 for a single stage ok? or is it good design practice to have 2 op-amp stages with gain of 10 each ? |
| MarkF:
Dave's video doesn't directly answer your question. However, it brings up interesting considerations. Pay particular attention to his passing statement at 3:00 which seems to address your question. |
| ZeroResistance:
--- Quote from: MarkF on May 04, 2019, 06:10:34 am ---Dave's video doesn't directly answer your question. However, it brings up interesting considerations. Pay particular attention to his passing statement at 3:00 which seems to address your question. https://www.youtube.com/watch?time_continue=240&v=ZvT9hHG17tQ --- End quote --- @ 3.00 he says "you should always try to do all of your gain in 1 op-amp". That's fair enough, I guess he is addressing signal to noise issues here, correct? |
| awallin:
one reason for splitting the gain into two stages is bandwidth. If your chosen op-amp can't give you 20dB of gain with the bandwidth you want you can instead split it to 10+10 dB with ~twice the bandwidth. For SNR usually more gain at the start of the signalpath is better. |
| MrAl:
Hi, The slew rate will be affected too, and the slew rate of the final op amp stage will not improve no matter how many stages you use unless you make the last stage (and possibly previous stages) a faster responding op amp which is usually higher cost. |
| Navigation |
| Message Index |
| Next page |