Re: Common emitter amplifier question (rc || rl)
From: Paul Burridge (pb_at_notthisbit.osiris1.co.uk)
Date: 01/30/05
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Date: Sun, 30 Jan 2005 16:02:52 +0000
On 29 Jan 2005 13:39:18 -0800, "cheese9988" <cheese9988@hotmail.com>
wrote:
>Hi, I have been trying to figure this out and its bugging me. On a
>common emmitter amplifier, you have rl (load resistance) and rc
>(collector resistor). How are these two in parallel with an ac signal?
>It looks more to me like rl is in parellel with the transistor and both
>being in series with rc. Can anyone explain this?
They are effectively in parallel because at signal frequencies the all
voltage supply points are ground (there is an 'invisible short' across
the battery or power supply at signal frequencies so your Vcc and GND
are one and the same). This only applies at signal frequencies, of
course, so at DC they're still pretty much isolated from eachother.
-- "What is now proved was once only imagin'd." - William Blake, 1793.
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