AD8367 as a wideband true RMS detector.

RE: AD8367 as a wideband true RMS detector.

DAB — Tue, 11 Jul 2023 19:15:23 GMT

Nice experiment post.

RE: AD8367 as a wideband true RMS detector.

scottiebabe — Tue, 11 Jul 2023 14:07:18 GMT

Nice automated test rig and great data points, thanks for sharing.

Assembly quality of this no-name board is questionable lol

RE: AD8367 as a wideband true RMS detector.

ggabe — Tue, 11 Jul 2023 02:53:22 GMT

The one attribute of AD8367 I don't like is the dB linear response of the XAmp architecture. I would prefer linear V/V, unfortunate that the Analog portfolio does not have a VCA like that.

Another concern is that 8367 attenuates the signal, then re-amps for the detector. Am afraid it's not helping the noise situation. The HP3400 "architecture" pushes all signals down to the 1mV full scale range, then amplifies for the rms detector. If I insert another attenuation/amplification ramp the noise floor gets even higher. Did not calculate how much, though.

RE: AD8367 as a wideband true RMS detector.

shabaz — Sun, 09 Jul 2023 18:57:09 GMT

Hi Michael,

This is an interesting part! I've always thought a lot of these sorts of chips may have come from old telecoms equipment (e.g. mobile phone base stations etc), since they must go through a massive volume of hardware regularly, and most of that stuff is almost money-is-no-object level of construction.