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I am a newbie, in my ele design , I never use PNP transistor , I always use NPN transistor . why we should use PNP, where We should use PNP,and how We use PNP.
In the early days PNPs worked better than NPNs which made them very popular in designs at higher frequencies and faster switching speeds. Now they work worse because the mobility of electrons is 3x higher than holes and NPN technology has improved. There are many situations where they work well. One is in a direct coupled amplifier of alternating types. Another is for high side switching.
we go for npn transistor for its speed.In IC design the performance of pnp deteriorates more because of the technology which make one transistor superior to the other. so the general use of pnp is limited to levelshifting circuits in say opamp.
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