when i use a resistive feedback ota as a TIA, i find that the feedback resistor leads to startup problem.
the ota is a 2nd-order opamp with miller compensation.
how to solve the startup problem?
Perhaps if you told us what the problem is, we could help you. Also writing out the meaning of acronyms such as "TIA" and "ota" the first time would facilitate understanding. Finally, capitalizing the first word of a sentence and the personal pronoun "I" would make your question more presentable.