Colleagues, why internal circuit operational amplifiers contained in the technical data are absent or passive elements in fact they consist of the transistors.
We used to build transistors and resistors and capacitors by diffusions into a substrate.
Now we do build tiny transformers with metallization on top of the die in our iso products.
In the old days (1960's and 1970's), there were a lot of analog engineers that were suspicious about
these new fangled op amps and companies wanted to impress customers with their clever circuit design,
so they would put in more or less, a complete schematic. To avoid being too cluttered, some things,
such as a two or four transistor current source is just shown as a circle with an arrow in it. We also leave
out all the parasitic diodes on the NPNs and PNPs for junction isolated parts. (But do use them in our sims.)
Today, it's hard for find an analog engineer. (We know, we try to hire them.) So the internal schematic
is not much use, other than possibly answering questions on the input pins or output pins.
Hello, harryh! Intelligent analog engineers reduce the internal circuitry of the PNPs and NPN stages, it is logical. A passive elements have also been reduced: resistors, сapasitors, inductances?
I'm not sure if that was a comment or a question? Engineers today are tackling bigger systems, so they
have moved up the hierarchy and consider a lot of the components they buy to be black boxes. The
ones that are really interested will read the textbooks on op amps such as Gray and Meyer or read
the IEEE papers.
It was a question from a technological side. On-chip circuits are made only some transitions P-N or N-P. Right?
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