Re: Transimpedance Amplifier - Photodiode Reciever Circuit


Chris wrote:
First off, I'm not sure where you got that quote of $13 for an AD817.
DigiKey has the DIP package in stock for $3.60 USD in unit quantities.
Although they don't have the SOIC in stock, their prices on quantity
are $2.02 to $2.88 USD. I think you can do better than $13, for sure.

Thanx Chris.
I looked up DigiKey.The shipping to New Zealand is horrendously
expensive. About $70. I dont think i could afford that.


It's unity gain stable, and also has a high gain-bandwidth product,
slew rate, and settling time. These are all important. Your 22nF cap
is a short at HF AC and an open at DC. Your application means it needs
to be stable when there's no signal, and very fast when there is one.
Also, the AD817 is specified for single supply operation -- the TL071
isn't.

Thank you for the above information, though i was using the circuit, i
was not completely aware of how it was working.


You know, I'm wondering. The photodiode doesn't seem to be that
unusual -- how about just shamelessly swiping a typical application
from p.2 of the LM311 data ***:

i think this would suit me better cost wise. Thank you very much

GB

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