I am looking to use the user defined feedback path of the ADA4350 evaluation board in order to amplify my photodiode signal which is detecting exponentially decaying fluorescence from a magneto-optical trap.
My requirements are a gain of around 1 MOhm and a BW of around 20 kHz. Due to constraints on the collection optics and therefore photodiode active area my choice of input parameters are approximately CD = 9-18 pF, in order to ensure the lowest possible dark current. Because of the high feedback resistor required I presumed that I would need to use the T network in order to achieve a stable output. However I see no capacity to implement this on the board. Could you please give me advice on how to approach this?
Secondly, the datasheet states a GBWP of 175 MHz. However, I think Fig. 72 (or even Figs. 62-65) of the data sheet implies GBWP on the order of 1010 for a gain and frequency response that I would like to achieve. Have I misunderstood something in this section?
Looking forward to your reply.
