Rare NE5534 IC Die Photo and Internal Schematics

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mediatechnology
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Rare NE5534 IC Die Photo and Internal Schematics

Post by mediatechnology » Wed Sep 28, 2011 9:31 am

This is what I believe to be a rare die photo of an NE5534 published in EDN. I received this as a Signetics Reprint.

"Scaling the Heights Toward the Ideal IC Op Amp," EDN, January 20, 1978

Image
Rare NE5534 IC Die Photo

Checkout those big-ass capacitors.
Didn't realize they had found a way to put the input noise curve on the die. Very clever. ;)

Image
NE5534 Internal Simplified Schematic
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Re: Rare NE5534 IC Die Photo

Post by emrr » Thu Sep 29, 2011 2:52 pm

now that's archeology.
Best,

Doug Williams
Electromagnetic Radiation Recorders

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Re: Rare NE5534 IC Die Photo

Post by mediatechnology » Fri Jun 22, 2012 12:53 pm

In a current EDN series "Analog Back to the Future" I found an interesting statement regarding the LM318 op amp and the trick used to get a 15 MHz op amp bandwidth in the 1970's:
Bob Dobkin, Linear Technology’s co-founder, vice president of engineering, and chief technology officer, spent his early design days at National Semiconductor, during which he moved op amps beyond the 1-MHz-bandwidth barrier with the LM318 (Figure 5). No fast PNP transistors then existed; there were only lateral NPNs (Editor - I think they meant PNP here) with 1-MHz bandwidth. Improvements in process technology helped, but the greatest speed gains often resulted from clever topological choices. Dobkin employed an architecture that split the input signal into a dc path through the lateral transistors and an ac path with feed forward capacitors that went around the PNP transistors for the 10- to 15-MHz bandwidth breakthrough.
http://edn.com/ContentEETimes/Documents ... future.pdf

This made me think: With only lateral PNPs available in the NE5532/NE5534 to the Mullard Designers (and perhaps Rupert Neve) how did they get the speed to make the 5534 suitable for audio?

I think they used Dobkin's LM318 split-path approach.
This may explain the 5534s internal workings.

Ignore the front-ends of the LM318 and 5534 which are completely different and look at the 2nd stage area around the PNPs.

This is the LM318 schematic:
Image
LM318 Internal Schematic

NE5534 Schematic:
Image
NE5534 Internal Schematic

It looks like C3? in the LM318 is providing the feed-forward path around the lateral PNPs.
Isn't that what the 40 pF capacitor is doing in the NE5534?

Both parts have the same "hook" in their open loop gain and phase response.

Image
LM318 Open Loop Gain and Phase Response

Image
NE5534 Open Loop Gain Response

Just a thought...

And one more thing. Am I the only one that has noticed the gorss error in the Philips and ON Semiconductor version of this part?

NE5534 Schematic with huge error:
Image
NE5534 Internal Schematic

The inputs in an NE5534 ARE NOT PNP.
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Re: Rare NE5534 IC Die Photo

Post by mediatechnology » Thu Aug 02, 2012 12:34 pm

Response From ON Semiconductor Service Request #149668
ON Semiconductor Technical Support Center
Thank you, we will review and update the datasheet.

Regards, Martin
ON Semiconductor
Technical Support Center
On Semiconductor, at my request, changed the NE5534 schematic which had the inputs shown as PNP with the "collector" loads tied to the emitters. It had been that way for years.

http://www.onsemi.com/pub_link/Collateral/NE5534-D.PDF

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Image
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A More Accurate NE5532 and NE5534 Schematic

Post by mediatechnology » Tue May 17, 2016 9:37 pm

Another find in the Raytheon 1989 linear databook was this NE5532 (RC5532) and NE5534 (RC5534) internal schematic.

Compared to the internal drawings shown by TI, ON and others, this one has component values and what appears to be fewer errors.
An example is R13 which is shown correctly in the RC5532 drawing but not in the TI.

Image
NE5532 Internal Schematic, Raytheon RC5532, 1989 Databook.

Note the differences between R3 and R4 comparing the NE5532 to the NE5534.

Image
NE5534 Internal Schematic, Raytheon RC5534, 1989 Databook.
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