Low Noise opamps for 2014?

[Bonsai]

The AD4898 looks a bit better below about 300 ohms.

I think all the very low noise BIP devices use Ib canceling. You have to run the IC relatively high to get the best noise performance. On the 5534 there is no cancelation and you pay for it with high Ib.

 

[Zero D]

RE - ISL28290 by mlise Post #141

Power Supply Bypassing and Printed Circuit Board Layout

Carbon or Metal-Film resistors are acceptable with the Metal-Film resistors giving slightly less peaking and bandwidth because of additional series inductance.

So ancient carbon tech has @ least one good thing going for it ! Who'da thought 😀

@ mlise

Thanx for the ISL28290 info as i wasn't aware of them before 🙂

 

[kgrlee]

Carbon or Metal-Film resistors are acceptable with the Metal-Film resistors giving slightly less peaking and bandwidth because of additional series inductance.

Is this supposition or has someone actually tested this?

If so, details please.

 

[Zero D]

Resistors

@ kgrlee

I was just quoting from the ISL28290 PDF in Post #141 I expect they musta tested to be able to state that !

 

[manso]

The 2068 doesn't even come close to the LM4562 for noise if that is the parameter you are interested in.

I see some other members already posted the correct information.

 

[Kastor L]

LT1115

LT1115 - Ultra-Low Noise, Low Distortion, Audio Op Amp - Linear Technology

Voltage Noise

1.2nV/ rtHz Max at 1kHz
0.9nV/ rtHz Typ at 1kHz
Voltage and Current Noise 100% Tested


LT1028

LT1028 - Ultra Low Noise Precision High Speed Op Amps - Linear Technology

Voltage Noise

1.1nV/rt Hz Max. at 1kHz
0.85nV/rt Hz Typ. at 1kHz
1.0nV/ rtHz Typ. at 10Hz


Not sure if lower noise than the LT1028 has been achieved yet.

There should be a list of record holders in every parameter hehe.

 

[Bonsai]

You need to consider current noise as well. It makes a very big difference with BIP input opamps.

 

[Calvin]

Hi,

the TIs OPA209 and OPA211 certainly look well (as their Dual and Quad-brethren).
The OPA209 with Data similar, resp. slightly better to the NE5534 and the OPA211 is looking like its ´better and costier brother´.
Similarly for JFET-Input OPAmps the OPA140 (better and costier) and OPA141 (and their Duals and Quads) seem to be an improvement over the run-of-the mill OPA134/21324/4134.

For very lownoise hybrids of discrete and OPAmps which have been very popular in many 80´s Phono-stages still look very promising.
Attached is a schematic for a very lownoise Hybrid-OPAmp as shown in Sergio Franco´s great book about OPAmps.
En settled at 0.5nV/sqr(Hz) and 1/f at 1.5Hz, lower than the figures of the OPAmp alone ( besides, the OL gain, GBP and PSRR raised)
A circuit which was featured in Elektor´s High-End-Preamp in 1986/87 and with a single Dual-PNP (MAT03) in Elektor´s MC-Preamp with balanced input in 03/1991.

Second attachment shows a Hybrid with a even lower noise SE-Input stage after D.Self published in WirelessWorld, specced at -139.5dBu equivalent input noise.

jauu
Calvin