How do I design a transimpedance amplifier?
Hi
I am given the job of designing a Transimpedance Amplifier (TIA) for a Laser Time of Flight Mass Spectrometer with the following specs.
Current input: 1 to 5 pA
Bandwidth (closed loop): 300 MHz.
Transimpedance gain: possible/suitable value
Noise performance: as low as possible/suitable for the application
I prefer to use OPA858 or LTC6268-10 opamp for this purpose.
I want a suggestion regarding how do I design such a high bandwidth TIA.
Suggestions including papers, application notes or any information will be highly useful.
Regards
M Arivalagan
Research Scholar
Anna University
Chennai
India
Added 6 years, 6 months ago.
1 Answer
Hi,
Thanks for contacting us! If you are designing a transimpedance amplifier using the OPA858 wideband operational amplifier you should consider three main things, the total input capacitance, the GBWP and the transimpedance gain RF.
You can take a look at the transimpedance amplifier circuit here (page 20) http://www.ti.com/lit/ds/symlink/opa858.pdf
I'd also recommend you to take a look at the layout example (page 26) where they say that when configuring the OPA858 as a transimpedance amplifier you should try to minimize the
inductance between the avalanche photodiode and the amplifier.
Hope that helps,
Elizabeth
Answered 6 years, 6 months ago.
