I need help in selecting an opamp for transimpedance amplifier. I need a very low current noise density in the order of fA/sqrtHz.Single supply is prefered with a bandwidth greater than 12KHz and gain of 10^6.I have already seen AD8627.
Thanks in advance
Current noise is extremely difficult to measure. The JFETs are usually 1-2 fA/rt-Hz or less.