So I am trying to understand I guess what is probably a basic concept of computers. I was taking a look at this previous question: From Transistor to Gates
And it's accompanying link: http://www.cs.bu.edu/~best/courses/modules/Transistors2Gates/
So let me get this straight, we use Transistors to build logic gates correct? Are these all usually Bipolar Junction Transistors? I also see that we also stuff multiple gates into an IC like so: http://www.kpsec.freeuk.com/components/74series.htm (Btw most of these have like....4-6 logic gates within them....is there such thing as a SINGLE gate you can buy, or would you have to build that single NOT/AND/OR/Whatever gate out of other transistors)
So...like for example, the IC's above....are those built using CMOS technology or TTL? Im a bit confused at what the difference between a TTL built transistor and a CMOS transistor. Like is this a TTL transistor or a CMOS transistor? (it is a biopolar one correct?):
I know this is a lot of questions, but Im just trying to understand how we go from Transistors to Gates to IC's. I mean.....the IC's I linked above (like the 74 series Logic IC's) are built from gates.....which must be built from transistors (CMOS or TTL?) But how come we never see like SINGLE gates being sold.....and if that's so then why do big transistors such as the one above exist if we can fit 6 logic gates in a small IC.
And do FET's come into play in Logic Gates at all....or not so much.
edit: ALSO any books/websites that talk about this is a HUGE help as well.