Jun 26, 2017 #1 K K4cle Newbie level 2 Joined Jun 26, 2017 Messages 2 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 12 What's a good op amp for single 5 volt positive supply that will work at 11 MHz?
Jun 26, 2017 #2 crutschow Advanced Member level 6 Joined Feb 22, 2012 Messages 4,458 Helped 998 Reputation 1,994 Reaction score 1,123 Trophy points 1,393 Location Colorado USA Zulu -7 Activity points 25,270 It depends upon how much gain you need at 11MHz.
Jun 26, 2017 #3 K K4cle Newbie level 2 Joined Jun 26, 2017 Messages 2 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 12 crutschow said: It depends upon how much gain you need at 11MHz. Click to expand... I am not looking for high gain, a gain of 10 would be sufficient.
crutschow said: It depends upon how much gain you need at 11MHz. Click to expand... I am not looking for high gain, a gain of 10 would be sufficient.
Jun 26, 2017 #4 KlausST Advanced Member level 7 Joined Apr 17, 2014 Messages 25,158 Helped 4,868 Reputation 9,757 Reaction score 5,536 Trophy points 1,393 Activity points 168,346 Hi, So the limit now is: gain × frequency = 10 × 11MHz = 110MHz of GBW. I recommend to use an Opamp with some headroom. Choose 150MHz GBW... or more if you are interested in low distortion, or your 11MHz signal is not pure sine waveform. And look for expectable rise and fall rate. Klaus
Hi, So the limit now is: gain × frequency = 10 × 11MHz = 110MHz of GBW. I recommend to use an Opamp with some headroom. Choose 150MHz GBW... or more if you are interested in low distortion, or your 11MHz signal is not pure sine waveform. And look for expectable rise and fall rate. Klaus
Jun 26, 2017 #5 crutschow Advanced Member level 6 Joined Feb 22, 2012 Messages 4,458 Helped 998 Reputation 1,994 Reaction score 1,123 Trophy points 1,393 Location Colorado USA Zulu -7 Activity points 25,270 You might also consider a current-feedback type op amp instead of the common voltage feedback. They do not have the gain-bandwidth limit of voltage feedback op amps and are more tolerant of stray capacitance at the feedback junction.
You might also consider a current-feedback type op amp instead of the common voltage feedback. They do not have the gain-bandwidth limit of voltage feedback op amps and are more tolerant of stray capacitance at the feedback junction.