I'm in the process of designing a Transimpedance amplifier for an analytical instrument. The sample waveform (hand-drawn) is attached in the attachments. The requirement is to amplify a pulse kind of signal whose maximum amplitude is around 700 nA and the width of the pulse is around 1 ns. So, I need a high-speed transimpedance amplifier.
My question is what are the opamp parameters that decide the speed of the amplifier. I need a concrete relationship between slew rate, settling time, rise time, bandwidth/gain-bandwidth. And particular to the signal which parameter is most important so that I can choose the right opamp for the design.
Regards
M Arivalagan
\$\begingroup\$
\$\endgroup\$
4
-
2\$\begingroup\$ Good luck. If you google for one, please note the price. You are probably looking for an opamp with bandwidth in excess of 5 GHz. \$\endgroup\$– Andy akaCommented Aug 24, 2019 at 12:09
-
1\$\begingroup\$ You forgot to give what gain on the output you want, this will determine the slew rate and Gain Bandwidth Produce scaling lets say you have 100MHz GBP, and a gain of 100, well then you have a Bandwidth of 1MHz, as I am assuming you would like a rather large gain you may have to approach it with a cascaded amplifier to keep the bandwidth high enough at the cost of some added noise. \$\endgroup\$– RerouteCommented Aug 24, 2019 at 12:21
-
\$\begingroup\$ You may find this enlightening: electronicdesign.com/analog/… \$\endgroup\$– Peter SmithCommented Aug 24, 2019 at 13:11
-
1\$\begingroup\$ It is important to know the source impedance ( usually, the source capacitance) to design a trans impedance amplifier. More information is needed. \$\endgroup\$– user69795Commented Jul 8, 2021 at 22:08
Add a comment
|
1 Answer
\$\begingroup\$
\$\endgroup\$
Consider this: a common-base amplifier
simulate this circuit – Schematic created using CircuitLab
For more bandwidth, increase the Vce to reduce Cob; thus take +5v to +10v.
answered Aug 25, 2019 at 4:42