Favorite Op-amp - Page 1
Forum section: electronics / general

author: Jester
author_rank: Frequent Contributor
timestamp: April 14, 2019, 01:17:35 pm
content: This is a bit like asking what’s your favourite car? Digi-Key offers 39,624 varieties and obviously the details of the application may eliminate some or many. That being said there are now many low cost options with rail to rail inputs and outputs, low offset, high drive capability etc. Further for many applications state of the art specifications are simply overkill.I prefer working with the SOT versions, small enough for most applications and easy to hand solder. When I include active, in-stock and wide supply rail, 39,624 becomes 10 and then <$1.00 becomes one, the NCS2007So what’s your favourite go to op-amp(s)?

author: Benta
author_rank: Super Contributor
timestamp: April 14, 2019, 01:23:14 pm
content: I've standardized on three parts:LM6171/72 and LMC6482.These cover 90% of my needs, but are not low cost. But I'm not really concerned with cost optimizing, as I only build 1...5 assemblies.

author: Nauris
author_rank: Regular Contributor
timestamp: April 14, 2019, 02:26:11 pm
content: LM324, it is good general purpose op-amp

author: dmills
author_rank: Super Contributor
timestamp: April 14, 2019, 02:44:55 pm
content: For audio work at traditional sort of supply rails and lowish source impedances you cannot go far wrong with the 5532/'34.For audio of the 9V battery sort, '072/'074s are pretty much jellybean, but fet input so higher voltage noise.LM324 when you want to get down to the negative rail, otherwise unimpressive, but that it does and is cheap as anything.Regards, Dan.

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 14, 2019, 03:19:53 pm
content: Ditto what Dan said.For R-R operation, TLC2272 /4. That covers the vast majority of my requirements.Having said this, there are times where it is unavoidable to employ specialized opamps.

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 14, 2019, 03:29:00 pm
content: Back in the late 70s, the CA3140 became a favorite. It was a 741 with ultra high input impedance.Greatly superseded nowadays, it still holds a piece of my (engineering) heart.

author: David Hess
author_rank: Super Contributor
timestamp: April 14, 2019, 08:33:09 pm
content: My favorite is the LM301A because its compensation terminal can be used either for clamping or as a transconductance output.

author: tggzzz
author_rank: Super Contributor
timestamp: April 14, 2019, 08:49:55 pm
content: My favourite depends on what I am doing.TAoE III contains lists of good opamps, together with their principal features and benefits.

author: AlanS
author_rank: Unknown
timestamp: April 15, 2019, 09:18:33 am
content: Quote from: dmills on April 14, 2019, 02:44:55 pmFor further info:http://www.ti.com/product/NE5532http://www.ti.com/product/TL072http://www.ti.com/product/LM324

author: bd139
author_rank: Super Contributor
timestamp: April 15, 2019, 09:41:21 am
content: I rather like the LMC6482 myself.

author: RoGeorge
author_rank: Super Contributor
timestamp: April 15, 2019, 09:43:32 am
content: Quote from: David Hess on April 14, 2019, 08:33:09 pmInteresting. Can not find any application note for LM301A as a transconductance amplifier, do you have a link, please?

author: Mortymore
author_rank: Frequent Contributor
timestamp: April 15, 2019, 10:00:28 am
content: For audio, my favorite has been OPA1602. Many times a replacement even for the well known 5532. Used them on CD/DVD players and pré-amplifier audio stages of amplifiers.When testing op-amps, after remove the original one I solder a socket to enable audio listening of different op-amps, and in the majority of the cases the OPA1602 is the one I prefer. Later soldered directly to the PCB.Never tested though, the expensive ones that some audiophiles seem to prefer, since the amplifiers that I moded until today, (and use opamps in the pre stage) don't justify the high cost.

author: nctnico
author_rank: Super Contributor
timestamp: April 15, 2019, 11:03:02 am
content: Quote from: tggzzz on April 14, 2019, 08:49:55 pmSame here. Almost every design I make seems to need an op-amp I have not used before. Other than that I see quite a few good suggestion for audio / voice communication use mentioned in this thread.

author: bd139
author_rank: Super Contributor
timestamp: April 15, 2019, 12:26:43 pm
content: Quote from: blueskull on April 15, 2019, 11:05:51 amIt doesn't hurt if you stand on itEdit: actually it's a really nice part :++

author: Zero999
author_rank: Super Contributor
timestamp: April 15, 2019, 02:59:51 pm
content: Quote from: dmills on April 14, 2019, 02:44:55 pmAlthough it will work off 9V and lower, the TL07x isn't really specified for running below 10V, so isn't ideal for running off a 9V battery. Interestingly, the TI datasheet only specifies it down to 10V (+/5V) but the ST datasheet says 6V.https://www.st.com/resource/en/datasheet/tl072.pdfhttp://www.ti.com/lit/ds/symlink/tl074b.pdfThe TL07x has much lower bias currents than the 5532/34, so lower current noise, which makes it less noisy, when the input impedance is high: above 15k, from memory.

author: Alex Nikitin
author_rank: Super Contributor
timestamp: April 15, 2019, 03:32:40 pm
content: Quote from: bd139 on April 15, 2019, 12:26:43 pmIt is just miraculous.CheersAlex

author: Kleinstein
author_rank: Super Contributor
timestamp: April 15, 2019, 04:19:56 pm
content: Quote from: blueskull on April 15, 2019, 11:05:51 amIt's a nice fast and low noise OP, but like most other CMOS not good for low frequency or DC.

author: David Hess
author_rank: Super Contributor
timestamp: April 16, 2019, 01:22:50 am
content: Quote from: RoGeorge on April 15, 2019, 09:43:32 amThe compensation pin can be used as a transconductance output but that does not make it a transconductance amplifier because it is always operating closed loop. Where it might be useful is as an alternative to clamping to reduce recovery time from integrator windup. Basically the compensation is moved to a point later in the signal chain so multiple operational amplifier outputs can be combined and then compensated. Without individual compensation, they have no integrator windup during overload and no recovery time.Current and voltage error amplifiers in integrated regulators work like this but access to the transconductance output of an LM301A lets it be used this way also. It might also be possible to use the LT1008 this way.Section X - Unusual Op Amp Applications - Perverting the Monolithic Op Amp, ofAnalog Devices 1992 Amplifier Applications Guidetouches on this subject.

author: Circlotron
author_rank: Super Contributor
timestamp: April 16, 2019, 01:35:28 am
content: Quote from: schmitt trigger on April 14, 2019, 03:19:53 pmYeah, they're nice.

author: David Hess
author_rank: Super Contributor
timestamp: April 16, 2019, 01:41:39 am
content: Quote from: blueskull on April 16, 2019, 01:24:06 amIt is relatively low noise for audio applications which is why they include a distortion specification but pretty horrible for low frequencies at 5uV peak-to-peak from 0.1 to 10 Hz which is the standard comprision. I am surprised they bothered to include that specification at all. As usual for a CMOS part, it has high flicker noise as indicated by its high noise corner frequency and flicker noise is really difficult to filter out; it is better not to add it at all if possible and in low noise systems, it commonly limits performance.It's flicker noise is high enough to also compromise low noise audio applications.

author: trophosphere
author_rank: Frequent Contributor
timestamp: April 16, 2019, 01:57:24 am
content: I use the OPA2335 for biomedical/signal acquisition applications.

author: splin
author_rank: Frequent Contributor
timestamp: April 16, 2019, 02:28:13 am
content: Quote from: schmitt trigger on April 14, 2019, 03:19:53 pmIf you can live with 200KHz GBW, compared to 2.18MHz for the 2272, the TLC2252 has a lot going for it for low frequency tasks drawing only 75uA/amplifier compared to 1.5mA for the 2272. It is noiser at higher frequencies - spec is 19nV/rt(Hz) @ 1KHz compared to 9nV for the 2272, but it actually has lower .1 to 10Hz noise - 1.1uV p-p ct. 1.4uV.It also has better DC drift at .5uV/K ct. 2uV and AVOL - 111dB typ ct. 91dB. Another factor in favour of the TLC227x/225x is that LCSC sell them for a third or less the price from usual distributors, which might not be the case for equialents from other manufacturers.

author: RoGeorge
author_rank: Super Contributor
timestamp: April 16, 2019, 11:25:21 am
content: Quote from: David Hess on April 16, 2019, 01:22:50 amNice bag of tricks!Thank you

author: Psi
author_rank: Super Contributor
timestamp: April 16, 2019, 11:35:42 am
content: The OPA549 always makes me happy.It's like the tank of opamps.8 amps continuous output at up to 60V single supply or 30v dual supply.Recommend application: source & sink lab powersupplyheheheI inherited a tube of 30 and like to use them for stupid stuff just because its funny.They cost to much to actually be worth buying for anything hobby related.

author: nctnico
author_rank: Super Contributor
timestamp: April 16, 2019, 12:15:08 pm
content: Quote from: Zero999 on April 15, 2019, 02:59:51 pmAccording to a designer of audio circuits I spoke to it doesn't really matter which one you use. The resulting noise is about equal between the two for typical audio applications.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 16, 2019, 01:26:36 pm
content: OPA1612 is my favorite for general purpose high end audio.

author: Zero999
author_rank: Super Contributor
timestamp: April 16, 2019, 03:28:35 pm
content: Quote from: Circlotron on April 16, 2019, 01:35:28 amExcept they don't have R-R inputs, just outputs. The inputs are only specified from VSSto VDD-1.5V.

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 16, 2019, 07:26:09 pm
content: You are correct, I should have added that info

author: hans
author_rank: Super Contributor
timestamp: April 16, 2019, 07:45:10 pm
content: ISL28133, because really want some more of that open loop gain at low current consumption.

author: SeanB
author_rank: Super Contributor
timestamp: April 16, 2019, 08:05:52 pm
content: Quote from: Psi on April 16, 2019, 11:35:42 amLH0033 similar for me, after all who else made a "DAMN Fast" amplifier.

author: Tedro
author_rank: Unknown
timestamp: April 16, 2019, 08:14:31 pm
content: OPA637/OPA627

author: ogden
author_rank: Super Contributor
timestamp: April 16, 2019, 08:27:22 pm
content: For near-DC applications: OPA333/OPA2333. Otherwise it depends. Unless you are working in one particular area like audio, you never know what kind of opamp you will need tomorrow. One day it will be > 100MHz GBW no matter how much heat it dissipates, another day you may look for low input bias current and shutdown pin to save power. There are so many different kinds of opamps for a reason.

author: David Hess
author_rank: Super Contributor
timestamp: April 16, 2019, 08:28:54 pm
content: Quote from: Zero999 on April 16, 2019, 03:28:35 pmI have used that series before where I needed a 324/358 with low input bias current or an output which goes completely to ground. Like all 16 volt CMOS process parts, they are very intolerant of over-voltage so beware; I found this out the hard way.As shown below, one section is a 4 resistor instrumentation amplifier that could have used any general purpose part and the second section is a low drift integrator used as an analog memory with 2N3904 base-collector junctions used as low leakage diodes to control leakage to the summing junction. One diode ramps the integrator one way and the other ramps it the other way to reset it. I do not remember what the drift was but it was probably like 10 microvolts per second. You can see that I used a pretty high quality capacitor but it was just what I had laying around in my junk box.The very similar National LMC6082 might have performed a little better and would have been my preferred part but the TI TLC2272 was in my box of samples and did what I needed.

author: james_s
author_rank: Super Contributor
timestamp: April 16, 2019, 08:45:29 pm
content: I tend to use the TL08x for general purpose stuff. It's not fancy but it does the job.

author: David Hess
author_rank: Super Contributor
timestamp: April 16, 2019, 10:36:26 pm
content: Quote from: james_s on April 16, 2019, 08:45:29 pmI do also but only because I am still working my way through a drawer full of them.The TL05x is a generally improved replacement for the TL08x at practically the same price. The TL03x is the low power version of the TL05x making it a replacement for the TL06x.I guess the even newer replacements were suppose to be the TLE207x series but they are considerably more expensive.All of these JFET input parts are also sometimes a replacement for the 301A because their input common mode range includes their positive supply making them useful as high side current sense amplifiers.

author: digsys
author_rank: Unknown
timestamp: April 16, 2019, 11:00:06 pm
content: LT1990 hands down:-) x1 x10Constantly dealing with HV +/= supplies, all sorts of rail voltages. Damn stable and accurate. If sex with ICs was legal .. errrr that's another story ...

author: Vtile
author_rank: Super Contributor
timestamp: April 16, 2019, 11:37:56 pm
content: If it do have BB stamp on it, I'm pretty sure that it is my favorite or at least close enough for hobbyist like me.

author: SilverSolder
author_rank: Super Contributor
timestamp: April 16, 2019, 11:47:01 pm
content: Quote from: digsys on April 16, 2019, 11:00:06 pmThat's one tough little IC!!

author: digsys
author_rank: Unknown
timestamp: April 17, 2019, 12:55:52 am
content: Quote from: SilverSolderThe reason I love it -https://pbase.com/digsys/image/161061565https://pbase.com/digsys/image/161061592I design / make EV battery packs, which can go up to 220VDC per module - Each BMS has 22x "floating" HV Inputs (+4 dedicated), which I can wire in ANYsequence to ANY cell in the pack .. PLUS .. I can connect, if I wish, LV Temp sensors, the LV battery, airflow sensors etc etc in ANY order !! to any Input.Naturally, IF I did that, I'd have to physically protect wiring, but in a race it means I have incredible flexibility / redundancy.These were originally developed for AC / DC motor sense / control systems, but screw those hippies :-)Full floating (1Mohm = close enough) +/- 250V

author: ubbut
author_rank: Regular Contributor
timestamp: April 17, 2019, 09:04:46 am
content: As others have pointed out, the TLC2272 is a good R2R alternative to the TL072.I would like to add the TLV2171, which has R2R outputs, and almost R2R inputs. It is a bit noisier, but also substantially cheaper.In terms of R2R alternatives for the NE5532, OPA1612 was suggestedbelowabove. A cost saving alternative is theOPA1678which is my new favourite OpAmpR2R output, costs almost the same as the 5532, similar performance,

author: SilverSolder
author_rank: Super Contributor
timestamp: April 17, 2019, 11:33:39 am
content: Quote from: digsys on April 17, 2019, 12:55:52 amI didn't know you could get op amps that would accept such high voltages. Learn something new every day!

author: splin
author_rank: Frequent Contributor
timestamp: April 17, 2019, 01:06:33 pm
content: Quote from: SilverSolder on April 17, 2019, 11:33:39 amThe ADHV4702 can up operate with supply voltage up to 220V:https://www.eevblog.com/forum/projects/new-high-voltage-opamp-adhv4702-1/

author: David Hess
author_rank: Super Contributor
timestamp: April 17, 2019, 02:01:33 pm
content: Quote from: SilverSolder on April 17, 2019, 11:33:39 amThe LT1990 is a difference amplifier and not an operational amplifier. Essentially it is an integrated variation of the standard 4 resistor instrumentation amplifier which can be extended to handle higher input voltages at the expense of precision.Quote from: splin on April 17, 2019, 01:06:33 pmIntegrated high voltage operational amplifiers have been around for a long time in various implementations. But watch out of the maximum differential input voltage which is only +/-2 volts for the ADHV4702.Quote from: ubbut on April 17, 2019, 09:04:46 amRail-to-rail outputs can also be added to a single operational amplifier by driving a pair of common emitter/source output transistors through the supply pins. This configuration as shown below is also useful for boosting the output slew rate and full power bandwidth at higher closed loop gains without sacrificing precision and noise.

author: digsys
author_rank: Unknown
timestamp: April 17, 2019, 02:28:36 pm
content: Quote from: David HessYou sure are tough marking :-). For the LT1990A, in preset x1 x10 gain mode, I get ~ 0.02% - 0.03%+ without trimming and gain linearity around 0.001%+

author: David Hess
author_rank: Super Contributor
timestamp: April 19, 2019, 11:40:49 am
content: Quote from: digsys on April 17, 2019, 02:28:36 pmIt is relative. The attenuation of the input signal by the input networks which raises the common mode range also directly increase the noise gain and lowers excess gain by the same amount. Without the attenuation, precision would be 25 times greater. This is not a problem for its intended applications where increasing the input common mode range is absolutely required and the decrease in precision is acceptable.The increase in noise and loss of precision are reflected in the input noise specifications and input offset specifications which are at least 10 to 20 times higher than the operational amplifier used.The big advantage of using a part like this is that the precision resistor network is included and its effects are part of the specifications. Designing a discrete implementation with similar performance using the same topology would be a real challenge.

author: technix
author_rank: Super Contributor
timestamp: April 19, 2019, 02:09:27 pm
content: For me it is LMV321/358/324 line. Cheap and generally works good.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 19, 2019, 06:52:09 pm
content: TLE2xxx Excalibur series, LT1468/69, ISL55001/55004, ISL28118, LT1800, LMP2021/2022, LMH6612, AD845, AD822, ADA4077,

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 19, 2019, 11:41:48 pm
content: From what I can gather from these posts, is that only a pair of companies; Texas Instruments (with Burr Brown and National), and Analog ( with Linear Tech) dominate this market.Conspicuously absent are original components from Onsemi ( with Fairchild), STMicro, Infineon. Although they second source many of them.My limited reckoning is that Micochip is working hard to also become a linear powerhouse.

author: guenthert
author_rank: Frequent Contributor
timestamp: April 20, 2019, 07:54:43 pm
content: Quote from: blueskull on April 15, 2019, 11:05:51 amNot available in PDIP, that's a real drawback for hobbyists like me

author: Gyro
author_rank: Super Contributor
timestamp: April 20, 2019, 09:00:28 pm
content: It's worth keeping a small stock of SO8 - DIP converter boards in the drawer.https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=so8+dip&_sacat=0

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 20, 2019, 09:07:08 pm
content: Quote from: Gyro on April 20, 2019, 09:00:28 pmIndeed, and throw in some for TSOP/MSOP too, as you get most new ones not in SOIC anymore.

author: David Hess
author_rank: Super Contributor
timestamp: April 20, 2019, 10:51:38 pm
content: Quote from: schmitt trigger on April 19, 2019, 11:41:48 pmI think Texas Instruments and Analog Devices are the last ones with high precision and performance linear IC processes other than Intersil which inherited from RCA and is now part of Renesas. Maxim got rid of theirs (sold to National?). Microchip never had one. Someone bought Fairchild's (National again?).

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 20, 2019, 11:25:16 pm
content: Quote from: blueskull on April 20, 2019, 10:57:57 pmWasn't rather Maxim the former fab of Tektronix + Dallas + ?

author: David Hess
author_rank: Super Contributor
timestamp: April 20, 2019, 11:54:43 pm
content: Quote from: blueskull on April 20, 2019, 10:57:57 pmI think you have the first one backwards. Tektronix sold their fab to Maxim who continued to make their custom ICs for them for a while.I had to look it up to refresh my memory. The old Fairchild was a pioneer in integrated circuits including high performance operational amplifiers and was bought by National. National later spun new Fairchild off with their discrete products and it was later bought by On Semiconductor. And of course Texas Instruments bought National and thereby the old Fairchild. Of course all of the interesting old Fairchild ICs were long gone by then.So for just operational amplifiers and going by memory:Burr-Brown -> Texas InstrumentsFairchild -> National -> Texas InstrumentsNational -> Texas InstrumentsPrecision Monolithic Incorporated > Analog DevicesLinear Technology > Analog DevicesI am probably missing someone. I don't know where the high performance Maxim stuff went.

author: SilverSolder
author_rank: Super Contributor
timestamp: April 21, 2019, 12:13:44 pm
content: Linear electronics is becoming a very mature market. Hopefully we won't get to a complete monopoly situation where even the simplest parts cost $$$.... perhaps competition from other parts of the world will keep that effect under some semblance of control, though?

author: nctnico
author_rank: Super Contributor
timestamp: April 21, 2019, 01:43:51 pm
content: Quote from: David Hess on April 20, 2019, 11:54:43 pmIsn't Maxim still making these themselves? Or did I perhaps miss Maxim being taken over...? Semiconductor manufacturers are like a lava-lamp. It is hard to follow which blob went where after a while.

author: David Hess
author_rank: Super Contributor
timestamp: April 21, 2019, 07:51:29 pm
content: Quote from: nctnico on April 21, 2019, 01:43:51 pmMaxim dropped their high performance linear process at some point and I think they dropped the RF bipolar processes they bought from Tektronix. They used to make OP-07s and similar in competition with Analog Devices and Linear Technology. Now it seems they only have CMOS stuff.The remaining two, Analog Devices and Texas Instruments, both have high voltage precision bipolar processes and high performance complementary bipolar processes. To me that makes all of the other manufacturers of operational amplifiers second class except perhaps for Intersil which I mentioned.There were some other small companies making high performance operational amplifiers but I do not see them around anymore.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 21, 2019, 09:15:29 pm
content: Quote from: David Hess on April 21, 2019, 07:51:29 pmStill around is Advanced Linear Devices (ALD).There was Elantec, which was aquired by Intersil. (EL-xxxx parts)And Comlinear, which was aquired by NatSemi. They brought the CLC-xxx high speed/bandwith components, which probably were the forebears of the LMH-xxxx high speed OPAs, whereas before the highest speeds National could offer were the LH-xxxx hybrids.

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 22, 2019, 02:24:42 pm
content: Intersil in particular has suffered from many acquisitions and divestitures.The Wikipedia page mentions that Harris acquired it, but there is a particular datapoint which tells me that they were briefly held by GE:Around the time my daughter was born, circa 1984, I went to a job interview. My interviewer brought out an Intersil databook, for which he asked me to explain the importance of certain parameters in a component datasheet.I distinctly remember the data book with soft black covers, which had a photo of a steaming light bulb with the caption:GE and Intersil. Hot ideas in CMOS.By then, GE had already acquired RCA. But shortly thereafter, "Neutron Jack" Welch became GE's CEO and he publicly stated that he hated electronics companies, and promptly disposed of all the assets, including its homegrown semiconductors, to Harris.At least that is how I recall it, but my memory may be fading.

author: David Hess
author_rank: Super Contributor
timestamp: April 22, 2019, 09:04:06 pm
content: Quote from: Neomys Sapiens on April 21, 2019, 09:15:29 pmALD came to mind but they are only doing CMOS parts now. Either they or someone like them was making OP-07s and similar precision bipolar parts at one point like Maxim was.QuoteI think there was also another company like Elantec which made high speed parts with a name that started with an A.QuoteI remember Comlinear but forgot National bought them until you reminded me. Comlinear must have had an early complementary bipolar process.

author: SilverSolder
author_rank: Super Contributor
timestamp: April 22, 2019, 10:12:40 pm
content: Any guesses as to the future?Will we (or our descendants) see the day where linear parts can only be purchased as part of a larger integrated circuit?

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 22, 2019, 10:43:19 pm
content: Quote from: David Hess on April 22, 2019, 09:04:06 pmI also thought so. If you look at:http://www.aufzu.de/semi/halbleit.htmlthere is a large list.I looked at the names, but no bell rang.

author: David Hess
author_rank: Super Contributor
timestamp: April 22, 2019, 11:00:59 pm
content: Quote from: SilverSolder on April 22, 2019, 10:12:40 pmNo, because linear parts do not scale well limiting integration. You might see sampling and digital parts emulating linear parts which happens even now but not at the lowest level of complexity. Part of this is simply because there are better ways of doing things if you have that much digital integration like with oversampling ADCs for audio; instead of trying to implement better integrated anti-alias filters, they raised the sampling rate and implemented a digital anti-aliasing filter before decimation. Instrumentation converters which replaced multi-slope converters are another example; they did not just make better multi-slope converters. Digital switching power controllers are another example.Quote from: Neomys Sapiens on April 22, 2019, 10:43:19 pmI tried finding it but my example was Elantec. I think Avantek was who I was thinking of but did they ever make linear integrated circuits or hybrids?

author: SilverSolder
author_rank: Super Contributor
timestamp: April 23, 2019, 12:53:27 am
content: Quote from: David HessWhat is the limiting factor? Is it down to linear parts using much more silicon area than digital circuitry?

author: BocaDev
author_rank: Contributor
timestamp: April 23, 2019, 12:57:31 am
content: My goto op-amps have been the TLC2272 and TLC2274. Never had any issues with these guys for my applications.

author: David Hess
author_rank: Super Contributor
timestamp: April 23, 2019, 02:26:22 am
content: Quote from: SilverSolder on April 23, 2019, 12:53:27 amAs I understand it there are two problems. One is that noise is simply greater with smaller transistor sizes. Even trailing technology linear parts deliberately use larger transistors than the process will support for this reason. The input differential pair on an operational amplifier is sometimes its largest feature and that is just two transistors. The other problem is that transistor quality decreases with smaller feature sizes. That is irrelevant for digital designs but critical for linear designs.To combat this, mixed-signal designs built on processes which support greater integration at the expense of linear performance try to move signals into the digital domain as soon as possible. Delta-sigma analog to digital converters are a good example of this.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: April 23, 2019, 09:45:08 pm
content: Quote from: David Hess on April 22, 2019, 11:00:59 pmThey made modules and possibly hybrids. And it is well conceivable that there were Avantek-branded ICs, whoever made them. So we can be both content that we still have them covered. Although I was surprised to see Analogic listed, whom I only knew for their Instruments.

author: David Hess
author_rank: Super Contributor
timestamp: April 24, 2019, 09:06:49 pm
content: Quote from: Neomys Sapiens on April 23, 2019, 09:45:08 pmAnalogic make a lot of potted hybrid stuff as did Analog Devices at the time. I have some Analogic databooks in storage. I do not remember them making integrated circuits.

author: Oldtestgear
author_rank: Regular Contributor
timestamp: April 25, 2019, 03:59:39 pm
content: QuoteGE owned RCA & Intersil for a while before selling to Harris Semiconductor. I worked for the combine as a PME in Camberley for about 6 months in 1987 & then moved on.Phil

author: AlanS
author_rank: Unknown
timestamp: May 27, 2019, 11:05:18 pm
content: I foound the following from CYCFI Research. This guy has done a lot of good work and updated his favourite AUDIO Op Amp list as recently as 2017. Good value.https://www.cycfi.com/projects/six-pack/op-amp-shootout/