Best Topology for Filtering Input Current to ADL5304 Logarithmic Amplifier

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#1 21677477 25 May 2017 13:49

Jim Gale Jim Gale

Anonymous

Post #1
21677477 25 May 2017 13:49

What kind of topology would be best for filtering current into a logarithmic amplifier like the ADL5304?
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#2 21677478 25 May 2017 20:47

Kevin Angelo Ma Kevin Angelo Ma

Anonymous

Post #2
21677478 25 May 2017 20:47

Well, from what I understand about log amps, it is a device which calculates the log of an input signal's envelope. (Refer "here("")":http://www.analog.com/en/analog-dialogue/articles/logarithmic-amplifiers-explained.html for more info on log amps) With regards to the topology, a general low-pass filter is used in filtering this log amps. There are two topologies discussed on TI's pages. Kindly refer to them: https://focus.ti.com/lit/ml/sloa088/sloa088.pdf
#3 21677479 26 May 2017 16:45

richard gabric richard gabric

Anonymous

Post #3
21677479 26 May 2017 16:45

If you are using it as a photodetector, then adding anything other than a photodiode to the input is not likely to be a good idea(consider leakage current, for example), filtering should probably be applied on the output. If you are wanting to use it with something other than a photodiode, then further explanation would be helpful.Cheers,
richard
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Best Topology for Filtering Input Current to ADL5304 Logarithmic Amplifier

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