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Doug Grant

Do We Need Any New Op-Amps?

Doug Grant
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Brad Albing
Brad Albing
4/30/2013 5:05:39 PM
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Re: New op amps?
I've used those too. pricey but effective.

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Brad Albing
Brad Albing
4/30/2013 5:04:38 PM
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Re: I love finding out about new Op-Amps
Andy - I'm sure you already know how this works. The apps guys or the FAEs would readily help if they knew there was an order to be had later for a bunch of parts. Otherwise, unless you just happen to pique the interest of the apps guy, not much will happen.

Still, this should be a straightforward design - wide BW op-amp plus a couple of power FETs. I assume you've looked thru some apps notes already. Perhaps we will get a suggested circuit here.

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Brad Albing
Brad Albing
4/30/2013 3:55:15 PM
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Re: New features in Opamps
I'm surprised that hasn't happened yet. I was discussing in another comment about how companies like Rockwell would love a part like that. Seems like the volume (annual usage) is there.

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Brad Albing
Brad Albing
4/29/2013 2:44:07 PM
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Re: A long way to go...
Thanks Gina. Some good info that helps clarify things a bit.

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Brad Albing
Brad Albing
4/29/2013 2:38:04 PM
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Re: New op amps?
Sadly, so few would be used (i.e., purchased by just a few people to prototype a ckt. - or hobbyists) that no mfr will make them because they would need to charge so much (to recover their NRE) that you could not afford them. How much? Think Mil-grade or rad-hard devices.

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Brad Albing
Brad Albing
4/29/2013 2:34:44 PM
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Re: We'll see new op amps until...
You make some good points as to why we may still need more new op-amps. Thanks.

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Brad Albing
Brad Albing
4/29/2013 2:32:31 PM
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Re: New features in Opamps
So, an early pioneer on solid state devices. Very cool. Would have been nice to get the perspective of someone from way back in the day.

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Gina.Hann
Gina.Hann
4/29/2013 2:17:09 PM
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A long way to go...
In response to the question of "why do we need new op amps?": While we certainly have our fair share of amps to choose from and a lot more that we can design (one of our engineers once estimated that there are over 10.3E8  possible amplifiers possible for us to design - not kidding!) the reason we design new ones has a lot to do with realizing some of the incremental changes needed in both performance and cost over time and process capability. Amplifier performance requirements change not just because of new process technology or new topologies (achieving zero-drift without the significant added errors of chopping frequencies in the past was unthinkable!) but also because the systems that you design using op amps change. Smaller, faster, more complex and even simpler all mean a change in the amplifier performance needed to meet the total system requirement. That 1nV/rtHz op amp for example could be the determining factor in whether or not your 16 or 18 bit SAR converter is able to realize it's 2LSB INL, and consequently whether or not that motor encoder you are designing will be accurate enough to maintain a smooth transition between steps. So, while we do have a lot of amplifiers to choose from, we also have a long way to go - we will keep making amplifiers as long as you keep engineering new stuff!

 

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Hughston
Hughston
4/29/2013 10:51:03 AM
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Re: We'll see new op amps until...
You would think that everything the designer could want is out there but not always. For example, there are lots of good instrumentation amps but then a few years ago Analog Devices came up with a very high temperature version IA in a small package for oil drilling equipment that was optimized for low impedance sensors.

I need an op amp that drives a lot of current close to the rail. I can get DSL drivers from Linear Tech that do that and I use one for that purpose but I want one in an 8 pin SOIC package that can drive good peak current close to the rail.  The parts on the market are not clearly speced and I have to try various parts out. I don't need to dissipate much power; I just want to deliver brief peak drive.

Most op amps are incremental improvements over older parts. Some of them are new versions of the old part in a new process. Process changes and improvements drive  a lot of the part obsolescence.

Generic improvements like lower power, lower noise, lower offset, lower operating voltage, are always welcome. Stability is something you take for granted, but don't always get with your circut configuration. Another thing that seems to be new in the last few years is to offer parts with RF immunity. Some parts had it in the past, but probably by accident.

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Vishal Prajapati
Vishal Prajapati
4/28/2013 9:28:39 AM
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Re: New features in Opamps
@JK, Thanks for sharing your experience. When I will need to implement, I will try the second method first. That seems easier but a bit complex than designing a full analog design.

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