ADC question
ADC question
(OP)
Hello All,
I'm currently performing an experiment in quantum optics that requires me to measure the intensity of a laser beam using a fast (2GHz) photodetector (THORLABS model DET01CFC). The photodetector outputs a current of maximum 100mA.
I would like to digitize into a stream of binary numbers a voltage proportional to this current using the proper analog to digital converter. When I say proper, I mean with maximum resolution and maximum sampling rate. THORLABS recommends using a 50 Ohms resistor at the opposite end of the detector (in this case the ADC) in order to maximize the bandwidth.
Can anyone suggest to me a company and/or model of an ADC that could suite the above requirements? I've been looking through different providers (Analog Devices, etc) but nothing seems to be compatible with what I would like to have.
Thanks in advance!
Louis
http://quic.ulb.ac.be/members/louis
I'm currently performing an experiment in quantum optics that requires me to measure the intensity of a laser beam using a fast (2GHz) photodetector (THORLABS model DET01CFC). The photodetector outputs a current of maximum 100mA.
I would like to digitize into a stream of binary numbers a voltage proportional to this current using the proper analog to digital converter. When I say proper, I mean with maximum resolution and maximum sampling rate. THORLABS recommends using a 50 Ohms resistor at the opposite end of the detector (in this case the ADC) in order to maximize the bandwidth.
Can anyone suggest to me a company and/or model of an ADC that could suite the above requirements? I've been looking through different providers (Analog Devices, etc) but nothing seems to be compatible with what I would like to have.
Thanks in advance!
Louis
http://quic.ulb.ac.be/members/louis





RE: ADC question
Glenn
RE: ADC question
IF you haven't had alot of experience laying out a high speed circuit board, get some expert help. That's pretty fast and it's far from trivial to plunk down a 2 GHz IC and make it work well. Often requires expensive software to lay out and optimize the circuit.
kch
Here's a note on TRW's latest ADC speed, 3 GHz.
A 10-bit, three giga-sample ADC, for example, samples an analog signal at the rate of three billion samples per second.
I'd expect the cost is extremely high.
RE: ADC question
RE: ADC question
Keith Cress
kcress - http://www.flaminsystems.com