Current Mirrors - = 2 4 2 1 1 O O m r r g It follows that 2...

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Passive and Active Current Mirrors
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Basic Current Mirrors Figure: (a) Diode-connected device providing inverse function, (b) basic current mirror. (a) (b)
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( 29 2 1 2 1 TH GS ox n REF V V L W C I - = μ ( 29 , 2 1 2 2 TH GS ox n out V V L W C I - = ( 29 ( 29 . 1 2 REF out I L W L W I =
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Cascode Current Mirrors ( 29 ( 29 1 2 1 1 1 2 1 DS TH GS ox n D V V V L W C I λ μ + - = ( 29 ( 29 , 1 2 1 2 2 2 2 DS TH GS ox n D V V V L W C I + - = and hence ( 29 ( 29 1 2 1 2 1 2 1 1 . DS DS D D V V L W L W I I + + =
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Active Current Mirror (a) (b) (c) Figure: (a) Differential pair with current-source load, (b) circuit for calculation of G m , (c) circuit for calculation of R out .
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1 1 m eq eq in P g R R V V + = 2 2 4 2 1 O m O m eq r g r g R +
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Unformatted text preview: + = 2 4 2 1 1 O O m r r g It follows that 2 4 2 4 2 1 O O O O in P r r r r V V + + = 4 2 2 2 1 1 O O O m P out r r r g V V + + = 4 1 2 2 2 O O O m r r r g + ≈ we have 4 2 2 2 2 4 2 4 1 . 2 1 O O O m O O O O in out r r r g r r r r V V + + + = 4 2 4 2 2 2 O O O O m r r r r g + = ( 29 [ ] . 2 2 4 2 2 O O m r r g = Figure: (a) Concept of combining the drain currents of M 1 and M 2 , (b) realization of (a). (a) (b)...
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Current Mirrors - = 2 4 2 1 1 O O m r r g It follows that 2...

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