Difference Amp.

George Herold · 2017-02-07T20:56:11+00:00

OK first a failure at Digikey. I went searching for difference amps, but they are listed in many different places. (So it's hard to look at them all at once. (See table 5.7 pg 353 in AoE3)) Most are listed as Differential amps w/o differential outputs. But the LT1191 is under programmable gain, and INA134 is under linear-amps-audio. (A section I'm going to have to troll a bit more... lotsa potential power op-amps, that I don't know about.) Anyway, I need a few difference amps. The ina132 is a reasonable example, An opamp with laser trimmed resistors already in place. I've been using an instrument amp, but it's overkill. I've never used a difference amp. First question, do you expect these to go away in the future? (say 10 years) Hmm that might be my only question. Would you use these instead of an opamp and 0.1% R's? Thanks George H.

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Jim Thompson 9 years ago

So belly-to-belly anti-parallel ?:-} ...Jim Thompson

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Phil Hobbs 9 years ago

This is a family show. (For values of "family" corresponding to dates before 1965.)

Cheers

Phil Hobbs

Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net

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Jim Thompson 9 years ago

Sno-o-o-ort >:-}

Yep. I'm of the Ozzie & Harriet era. ...Jim Thompson

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George Herold 9 years ago

Grin, I'll never think of my belly to belly, anti parallel diodes the same way again. I worry about people plugging things in without the power on... but the diodes take care of that too!

George H.

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krw 9 years ago

Depends on quantities. I think we pay about 100x for a 0.1% resistor than we do for a 1% resistor but that doesn't make it exactly expensive (relative to an amplifier). I'm trying to find some small (0402 equivalent) arrays.

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Robert Latest 9 years ago

Good for them. I'm just saying: When doing, for instance, a wafer size transfer there is always that last low-volume product that's neither worth keeping the old line alive for, nor transferring it, no matter margin or visibility. I have a 100->150mm transfer behind me and am in the middle of going to 200mm in a NXP (now Nexperia) waferfab, so I've been down that road. Of course it's mostly automotive customers clinging to the old products.

robert

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Difference Amp.

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