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Logarithmic Amplifier Chip Design and Application Considerations

Posted May 03, 2017 12:00 AM by Engineering360 eNewsletter

Able to compress a signal of wide dynamic range to its decibel equivalent, logarithmic amplifier chips produce an output voltage that is directly proportional to the logarithm of an input voltage or current. These chips are often useful in applications involving signal compression.


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Guru
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#1

Re: Logarithmic Amplifier Chip Design and Application Considerations

06/14/2017 1:38 PM

Does anyone know of a chip with dual log amps on it? I want to take two microphone signals (attached to a vessel with stuff taking place in it, such as normal boiling, and maybe "bump" boiling, rectify the AC signals, smooth with about a 1 second to 2 second time constant, then use this as input to log amplifiers (to arrive at a decibel signal to be output in the range of 0-5 V. I know TI has some log amps with internal 2.5 V reference, but did not find a package with dual on one chip (not that it is all that much harder to just use two chips).

The package type shown in the OP is surface mount, is that correct? I am still learning how to do that with small chips.

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Guru
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#2
In reply to #1

Re: Logarithmic Amplifier Chip Design and Application Considerations

07/17/2017 10:26 PM

James Stewart: What is a big thing in using two chips? I have some LOG100JP DIP package and may be able to spare 100 numbers. I got for US$5000 total 100 numbers locally. LOG2112 is dual. It is SMD.

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Guru
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#3
In reply to #2

Re: Logarithmic Amplifier Chip Design and Application Considerations

07/18/2017 9:33 AM

Shyam: It is not a big thing to have the dual chip.

Who makes the LOG100JP DIP? Is that TI product?

$50.00 USD each? I know these things are not cheap, but did not expect them as high as that.

Are these high bandwidth log amp? Do you have a link to the spec sheets?

Thanks for all your help on this aspect of my experimental project thus far.

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