Transimpedance Amplifier - Photodiode Reciever Circuit

Hi all,
Need help with component choice!
Trying to build a photodiode recieving circuit. Came up with the
circuit below after reading a few things and scavenging come circuit
designs.
please refer link for circuit schematic
http://generous.boy.googlepages.com/photodioderecievingcircuit



VCC
+
| VCC
.-----. |
| | |
| | .--------o
.-. | | |
56k| | | | |
| | | | |
'-' | .-. |
| |/ 120k| | |
|---| | | |
| |> '-' |
| | | |
| | | |
| .-. | |
110nf --- | | | | __68k
--- | | 47 | .-----)--|___|---.
| '-' 22nf | | | |
| | | | ' |
'-----| || | | |\| |
o---------||-----)--o---|-\ |
| || | | >-------------
| o------|+/
photodiode - | |/|
^ .-. |
| 120k| | |
| | | |
| '-' |
| | |
o----------------o--------'
|
GND
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)

The op-amp converts the current signal to a voltage signal.

The circuit worked fine with an AD817AN as the amplifier. But the
AD817AN is too expensive, $13. I tried just pluggin in a few other
amplifiers that were around.. None give me a clean output.

The photodiode(BP104) is reciving pulses (square wave with "on" time of
10us and varyin "off" times)
the frequency of the incident pulses can vary from 14KHz to 50KHz.
What criteria should i take into consideration while choosing the
op-amp?
I thought i would be lookin at the Gain Bandwidth Product(GBP) but dont
know if i am lookin at unity gain (becuase it is a transimpedance
amplifier) or for gain of 68k (the feedback resistor).

I skimmed through www.rsnewzeland.com, but could not find something
with the same spec's as the AD817 for a lesser cost. Do i need such a
high spec op-amp? I am running it of single supply 5v

BP104- photodiode http://www.jaycar.co.nz/products_uploaded/ZD-1947.pdf

.

Relevant Pages

  • Re: Help with HV common emitter and push pull stage amplifier
    ... >> I'm designing a high voltage amplifier and running into problems that ... >> help with gain) ... >> a diode and current limiting resistor drop), ... >> this circuit, just DC offset. ...
    (sci.electronics.design)
  • Re: Transimpedance Amplifier - Photodiode Reciever Circuit
    ... Need help with component choice! ... Trying to build a photodiode recieving circuit. ... I thought i would be lookin at the Gain Bandwidth Productbut dont ...
    (sci.electronics.basics)
  • Re: Automatic gain control
    ... Does anybody have an idea of how to build an automatic gain control ... the circuit! ... How can the amplifier know the difference between a 10mV 10% output and a 10mV ... AGC loop adjusts gain until output is constant. ...
    (sci.electronics.design)
  • Re: Voltage Gain Switch (Design Help)
    ... an electronic circuit that will replace an obsolete Voltage Gain Switch ... High Precision Gain ... I know about amplifier design, ...
    (sci.electronics.design)
  • Re: Voltage Gain Switch (Design Help)
    ... an electronic circuit that will replace an obsolete Voltage Gain Switch ... High Precision Gain ... I know about amplifier design, ...
    (sci.electronics.design)
Loading