transistor output voltage polarity

Thread Starter

amaresh92

Joined Oct 31, 2010
23
greetings,
when a transistor in common emitter configuration is given a ac signal with base current,the amplified output form from collector of it gives inverted polarity of the input voltage or the output graph of voltage versus time gets inverted of input graph of voltage versus time.how is it so?

thanks.
 

SgtWookie

Joined Jul 17, 2007
22,230
Why don't you try using a SPICE simulator on a transistor with emitter and collector resistors?

It's just the way it works; the collector has the polarity inverted from the input on the base. The emitter is basically (sic) in-phase with the input on the base.
 
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