Question about transistor names ?

[Abbie]

Is bipolar and ttl the same thing,
is mosfet, cmos, mos, fet the same thing ?

 

[Chris Welsh]

"Abbie" <AbbieAbbieAbbie@btinternet.com> wrote in message
news:bpl6hv$c1n$1@titan.btinternet.com...

Is bipolar and ttl the same thing,
is mosfet, cmos, mos, fet the same thing ?

Bipolar usually refers to a type of transistor , such as Bipolar Junction
Transistor (BJT)

TTL refers to Transistor-Transistor Logic, and describes how how the
transistors are connected in order to make logic devices.....

a FET is a Field Effect Transistor, a different type from a BJT, and MOSFET
(Metal Oxide Semiconductor) is a subclass of FETS. CMOS is kinda like TTL,
it describes how MOSFETS are put together in order to make logic devices
(CMOS : Complementary MOSFET)

Chris

 

[Dimitrij Klingbeil]

"Abbie" <AbbieAbbieAbbie@btinternet.com> wrote in message
news:bpl6hv$c1n$1@titan.btinternet.com...

Is bipolar and ttl the same thing,
is mosfet, cmos, mos, fet the same thing ?

Not really.

TTL means transistor-transistor-logic, the sort of IC design where the
reception of the input signal, the logic and the output drive are all
handled by bipolar transistors.

FET means field-effect-transistor.

MOSFET means metal-oxide-semiconductor FET (just a sort of FETs).

MOS is an abbreviation for the MOSFET transistor technology.

CMOS means complementary MOS(-FET IC design) (where both n-channel and
p-channel MOS FETs are used in one chip so that one acts as pull-up, the
other as pull-down in output drive/amp stages)

Note to the more experienced: please correct my mistakes.

Dimitrij

 

[David Wood]

Is bipolar and ttl the same thing,

No, or they wouldn't have different names. Bipolar refers to a
particular common type of transistor (junction) and ttl is an
abbreviation for transistor-transistor logic, a method of using
transistors in circuitry.

is mosfet, cmos, mos, fet the same thing ?

Same answer as above on the general question. Specifically, metal
oxide semiconductor field effect transistor (mosfet), complimentary
metal oxide semiconductor (cmos), metal oxide semiconductor (mos) and
field effect transistor (fet), but judging from your general ignorance
(not a bad thing, we all start that way) I doubt the long names help
much. For more explanation try a google search on "electronic
dictionary" or similar. Here's one hit I found:
http://www.twysted-pair.com/dictionary.htm

 

[Abbie]

I learnt it a long time ago but I have forgotten. It seems I was
partially right as mosfet, mos, and fet are the same.
cmos is just a bunch of mos's and ttl is just a bunch of bipolars.





"David Wood" <davidwood911@yahoo.com> wrote in message news:90c30deb.0311211441.444b20ba@posting.google.com...

Is bipolar and ttl the same thing,

No, or they wouldn't have different names. Bipolar refers to a
particular common type of transistor (junction) and ttl is an
abbreviation for transistor-transistor logic, a method of using
transistors in circuitry.

is mosfet, cmos, mos, fet the same thing ?

Same answer as above on the general question. Specifically, metal
oxide semiconductor field effect transistor (mosfet), complimentary
metal oxide semiconductor (cmos), metal oxide semiconductor (mos) and
field effect transistor (fet), but judging from your general ignorance
(not a bad thing, we all start that way) I doubt the long names help
much. For more explanation try a google search on "electronic
dictionary" or similar. Here's one hit I found:
http://www.twysted-pair.com/dictionary.htm

 

[Henry Kolesnik]

Bipolar means you have 2 current carriers.
"Abbie" <AbbieAbbieAbbie@btinternet.com> wrote in message
news:bpl6hv$c1n$1@titan.btinternet.com...

Is bipolar and ttl the same thing,
is mosfet, cmos, mos, fet the same thing ?

 

[R. Steve Walz]

Abbie wrote:

Is bipolar and ttl the same thing,
is mosfet, cmos, mos, fet the same thing ?
-------------

The orignal plain, S, and 74-series LS TTL logic family was bipolar,
because bipolar means bipolar transistors, which are ONLY the NPN
and PNP type, with an emitter, base, and collector.

FETs are field-effect transistors, MOSFETs are the common type, and
CMOS is the logic family made with MOSFETS. MOSFETs have a source,
gate, and drain that correspond to some degree to the bipolar EBC,
but function a bit differently, operating by gate voltage rather
than base current to regulate a major current in the collector-emitter
path or drain-source path. The two types, enhancement and depeletion
mode, correspond roughly to NPN and PNP.

-Steve
--
-Steve Walz rstevew@armory.com ftp://ftp.armory.com/pub/user/rstevew
Electronics Site!! 1000's of Files and Dirs!! With Schematics Galore!!
http://www.armory.com/~rstevew or http://www.armory.com/~rstevew/Public

 

[Wim Lewis]

In article <bpmddb$prq$1@sparta.btinternet.com>,
Abbie <AbbieAbbieAbbie@btinternet.com> wrote:

I learnt it a long time ago but I have forgotten. It seems I was
partially right as mosfet, mos, and fet are the same.

No, there are other kinds of FET besides MOSFETs. JFETs (junction FETs)
are pretty common. There are probably also a bunch of specialized
kinds.

cmos is just a bunch of mos's and ttl is just a bunch of bipolars.

CMOS means circuitry built using *complementary pairs* of MOSFETS. Non-
complementary MOSFET logic (PMOS and NMOS) used to be pretty common.

TTL originally meant logic built using bipolar transistors, but now
it's often used to describe voltage levels compatible with the original
TTL specs (even if the circuit isn't actually TTL any more).


--
Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1