lecture06 - I B : out of B I c : into C I c : out of C I c...

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What is I Q ? What is the gain? Are the biasing resistor properly chosen? Can we increase the gain to 200? Common emitter amplifier
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200 ac flows here ac gain = -20k/200 = 100 (better answer later) Look at where ac flows
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Ebers Moll equation for transistor ) 1 ( 0 KT eV s c BE e I I KT eV s c BE e I I ~ C C BE E I e kT dI dV r If I c is measured in mA: : C E I r 25 e.g. I c =1 mA, r E = 25 :1# Not that small! KT eV s c BE e I I ~ : C E I r 25 60 mV G V BE per decade G I C I c V BE
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Current mirror NPN PNP B B E E C C i B i B i C i C V BE >0.6 V EB >0.6 I B : into B
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Unformatted text preview: I B : out of B I c : into C I c : out of C I c = E I B I c = I B Internal resistance revisited V th R th R load V out = V in R th + R load R load Ideal voltage source: Rth small or large? 10V 10M : R load Ideal current source: Rth infinite (a) R load = 10 : , I = ?, V = ? (b) R load = 1 k , I = ? V = ? (c) R load = 10 M , I = ? V = ?...
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This note was uploaded on 09/25/2011 for the course PHY 4802L taught by Professor Reitze during the Spring '11 term at University of Florida.

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lecture06 - I B : out of B I c : into C I c : out of C I c...

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