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Now FET is the mainstream in IC manufacture,and even most analog circuits can be realized with FET.So I want to ask whether BJT will be still used in the future?
oh yea it will........
what about microprocessors...? pentium 4 is here but tell u most microprocessors produced is not the latest but old one....... coz they are cheap..... and advance feature is not necessary there.
no... i am pretty sure most popular microprocessors uses CMOS logic
nonetheless, for high speed, high frequency, and linear circuitry bipolar transistors is still used. Also, hybrids such as BiCMOS are also extremely popular.
Mostly low power device espeacially portable device will use CMOS. However, there are still somethings that bipolar are better at than CMOS.
Hybrids such as BiCMOS process takes the best of both worlds and combines them into one. The only obstacal is BiCMOS process is still relatively expensive, but this will one day come down.
So espeacially to all the students out there asking the same question, rest asure that what you are studying is useful.
the point here is that if the researchers still follow the moor's law then the use of BJT and even CmOs is going to be effected.
But some high frequency levels BJT should be used.
BUt the point of integration i think its life is over
My first electronics class was the last that my school taught tubes (valves) first, then taught transistors. Of course everyone complained. It's funny that for the next 30 years people wrote about the obsolescence of tubes while looking at a CRT (and cooked their lunch in a microwave oven). Any microwave guy will tell you that no transistor has ever matched the performance of a tube (valve) in that domain.
I went to work for a place that was building an automated phone response system. All the new engineers had extensive training in digital technology both hardware software and built a spectacular machine. That was until they tried to change from using 25MHz '386's to using 50MHz '486. The trouble was that no could get a PC Board working. Without any analog background what-so-ever, they were lost. They actually had some engineers from Intel come in at night to redesign the PC Boards and the hardware, since the new digital engineers hadn't a clue what was wrong. Since then, colleges have started teaching analog AND digital again. Without remedial training, those all digital hardware engineers are almost worthless.
My point is that just because a new technology comes along doesn't mean the older technology is going to disappear.
No matters what ever technology it is..may not last forever
Every technology has its advantages and disadv..
who knows when any modification in ttl logic changes and so it may be faster and higher performance than all other...
So..the bottom line is have knowledge of all...any time it can be pulled up by technology
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