Chap2_exercise

Chap2_exercise - 21 UCC=12V UCE 7V 11.5V 0.5V UCC A. U 7V...

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2 - 1 -- U CC =12V -- U CE --- 7V - 11.5V - 0.5V ---------- R S R B R C + + U S u O - U CC A. U CE 7V ---------- B. U CE 11.5V I C -------- C. U CE 0.5V I C -- , I B I C -- U CE - 7V -- U CE - 11.5V -- U CE - 0.5V --
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2 - 2 -------------------- U CE ≈U CC ------------------ - U CE <U BE ------------------ R S R B R C + + U S u O - U CC - U CE ≈U CC U Rc ≈0 -- I C - 0 --------- --- I B --- R B - U CE <U BE --------- --- I B --- R B
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2 - 3 U CC =12V - R C =2.2KΩ,β=60 - U BE =0.6V - U CE =6V - R B = - - I C =1.5mA - R B = - -- R B =0 --------- ------- R S R B R C + + U S u O - U CC I R U U C C CC CE - = 2 . 2 6 12 R U U I C CE CC C - = - = =2.73mA A 5 . 45 I I C B μ β = = 5 . 45 6 . 0 12 I U U R B BE CC B - = - = =250.55KΩ A 25 60 5 . 1 I I C B = = = 25 6 . 0 12 I U U R B CC B - = - = =456KΩ - R B - 0 - U CC ---- B --------- ----------- u ce ----
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R U U I B BE CC B - = 2 - 4 ----- β=40 - ------- Q ----------------------------------- -- A U - r i - r o - I C (mA ) U CE (V) 4 3 2 1 100 75 50 25μA 2 4 6 8 10 240 7 . 0 12 - = V 6 6 12 I R U U C C CC CE - = - 50μA mA 2 I I B C β = ------- -- (0 - 4) - (12 - 0) I B = 50μA -- Q - I C - 2mA - U CE - 6V U C1 - U BE - 0.7V U C2 - U CE - 6V 240 K 3K + + u O +12V u i 3K u i R B R C R L r be i b i c β i b u O r R ' A be L u - = 72 - = + + = K 833 . 0
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This note was uploaded on 10/11/2011 for the course ME 100292 taught by Professor Zhang during the Winter '10 term at Tongji.

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Chap2_exercise - 21 UCC=12V UCE 7V 11.5V 0.5V UCC A. U 7V...

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