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| BJT bias point - RF Cafe Forums | ||||||
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Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
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Below are all of the forum threads, including all the responses to the original posts. Noise Post subject: BJT bias point Posted: Sun Jan 07, 2007 7:47 am Captain Joined: Tue May 02, 2006 4:59 am Posts: 15 Can anyone explain how the Emitter resistance RE stablize the DC bias Point ? ( commom emitter ). Something about negetive feedback ? Is this stabilization is instead active bias ? Top IR Post subject: Posted: Sun Jan 07, 2007 2:20 pm Site Admin Joined: Mon Jun 27, 2005 2:02 pm Posts: 373 Location: Germany RE is used as a negative feedback. The current gain of Beta increases with the operating temperature of the BJT. Therefore Ic (Collector current) raises. This current flows through RE and as a result the voltage drop on RE increases - Ve becomes higher. Vb is usually kept constant in common emitter topology (By means of a voltage divider), hence Vbe decreases, which turns the BJT more to off state and reduces the Ic. This mechanism can be used instead of active bias. Posted 11/12/2012 | ||||||
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