lecture12

# lecture12 - n D V L W k V V L W k I =-=(DC Current 29 2 2 1...

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BIASING IN MOS AMPLIFIER CIRCUITS Biasing by Fixing VGS The Bias point depends too much on the particular transistor selected. Biasing by Fixing V G and Connecting a Resistance in the Source Resistor S R introduces feedback and changes GS V if D I changes as when transistors are interchanged. D S GS G I R V V + =

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Biasing Using a Drain to Gate Resistor This form of biasing also regulates GS V by means of feed back D D GS DD I R V V + = Biasing Using a Constant Current Source The most effective scheme for biasing MOSFETs SMALL-SIGNAL OPERATION AND MODELS Conceptual circuit utilized to study the operation of the MOSFET as a small-signal amplifier. ( 29 2 2 ' 2 1 ' 2 1 OV n t GS

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Unformatted text preview: n D V L W k V V L W k I =-= (DC Current) ( 29 2 ' 2 1 t gs GS n D V v V L W k i-+ = (Total Current) ( 29 ( 29 ( 29 2 2 ' 2 1 ' ' 2 1 gs n gs t GS n t GS n D v L W k v V V L W k V V L W k i +-+-= ( 29 gs t GS n d v V V L W k i-= ' (AC Current) OV gs V v 2 < < ( 29 OV D OV n t GS n m V I V L W k V V L W k g 2 ' ' = =-= D m V R g A-= SMALL-SIGNAL OPERATION AND MODELS Small Signal Equivalent Circuit Models EXAMPLE 4.10 Small Signal Voltage Gain Input Resistance Largest allowable Input Signal V V t 5 . 1 = ; 2 / 25 . ) / ( ' V mA L W k n = , V V A 50 = The T Model...
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lecture12 - n D V L W k V V L W k I =-=(DC Current 29 2 2 1...

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