That is quite easy. There lot of cmos type opamp with low drift spec. You can have t network on feedback which keep cost down for single opamp design. You also need cap on feedback to keep it stable.
On 2 Aug 2016 20:24, "
t.obulesu@... [LTspice]" <
LTspice@...> wrote:
>
> ?
>
> Hello ?guys..
>
> I want to design a trans-impedance amplifier to detect currents of the APD (in the range of 200 nA to 100 micro A).
>
> Could some one suggest me the best IC with less bias current, single supply (+5 V only) and how to design a high sensitive TIA..? (typically, for every 100 nA change in the current, 100 mV voltage should be displayed).
>
>
>
