Question for those familiar with IIL (integrated injection logic)

[FOIWATER]

Attached is a picture of IIL (integrated injection logic) cell. I understand the operation of the second (bottom-most) transistor, and analysis of digital circuits is adequate only understanding the operation of this transistor.

I do not understand the operation of the transistor with grounded base. Does it act as some sort of voltage regulator?

Any information, is appreciated.

 

[phyzguy]

I don't know the answer to your question, but FWIW, I don't think anybody uses IIL anymore. It was conceived back in the 1970's, and CMOS logic has come so far since those days that I don't know why anyone would care about IIL. Perhaps your question is just intellectual curiosity, but if you are learning about logic families I would suggest focusing elsewhere.

 

[FOIWATER]

I have received almost an identical response regarding a CMOS inquiry.

IIL has its applications, any information is appreciated.

 

[AlephZero]

Maybe you can't understand it because the diagram is wrong. Compare it with
http://en.wikipedia.org/wiki/Integrated_injection_logic

 

[FOIWATER]

I read that article and still wasn't sure what the transistor is for.

It isn't wrong - do a google search for images on IIL, you will get as many or more hits of the circuit I posted.

 

[FOIWATER]

In fact, if it acts as a current source, they would be the same circuit.

any one know if that is the case

 

[dlgoff]

I read that article and still wasn't sure what the transistor is for.

It isn't wrong - do a google search for images on IIL, you will get as many or more hits of the circuit I posted.

The only one I see is the one from AlephZero's link.

 

[FOIWATER]

how about the one I've attached.