LT6233-10, Bandwidth issue

Hi,

With LT6233-10 GBW=320MHz, 2MHz bandwidth is not attainable with a gain of 200. 320MHz/200 is 1.6MHz. The gain-bandwidth product is the product of the closed-loop gain and the 3db closed-loop bandwidth at that gain. Increasing the gain, directly decreases the bandwidth. Here is a mini-tutorial for more information. 

You may want to consider LTC6252 in your design. It gives the expected output for your attached configuration, gain=40, up to 2MHz using single supply. To achieve output with gain=200, 2MHz, and input=20mVpp, dual supply is needed.

Ezone_LT6233-10, Bandwidth issue_LTC6252.asc

Ho thank for your answer. 
your right about the gain =200. But in my test, I’m with a gain at 40, I must have 8mhz bandwidth, but I don’t event have 1mhz.

do you have an other ref, the ltc6250 have a consumption too High even in shutdown.

I need a very low power mode.

I talk about 2mhz bandwidth to have some marge. But 1mhz , 1.5mhz is ok.

but I don’t have it yet

Ho thank for your answer. 
your right about the gain =200. But in my test, I’m with a gain at 40, I must have 8mhz bandwidth, but I don’t event have 1mhz.

do you have an other ref, the ltc6250 have a consumption too High even in shutdown.

I need a very low power mode.

I talk about 2mhz bandwidth to have some marge. But 1mhz , 1.5mhz is ok.

but I don’t have it yet

Hi, 

Apologies for missing this. Can you specify how low the power mode should be? If there are other parameters important for you application, please feel free to share. 

There are parametric search for different kinds of amplifiers. Here is the one for rail-to-rail and for low power op amps. Hope this helps.

hi sorry for delay, I don't have any notification on your replay.

with these search, with a high Gain, I always finish with low noise amplifier, which need a low input impedance, whereas my previous stage need a load at 10Kohms min. I don't want to use a buffer (low consumption). 

So,  lower consumption in use mode (few mA), single powered by 3,3V, bandwith -3dB 1MHz for a 200 gain

thank for your help