current mirrors

current mirrors - ECEN 326 Electronic Circuits Current...

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ECEN 326 Electronic Circuits Current Mirrors Dr. Aydın ˙ Ilker Kar¸ sılayan Department of Electrical and Computer Engineering
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Simple Current Mirror Simple Current Mirror Bipolar Q I REF -V EE Q 2 O 1 V CC I B1 I B2 I I C1 V BE1 = V T ln I C1 I S1 = V BE2 = V T ln I C2 I S2 I S1 = I S2 I C1 = I C2 = I C I B1 = I B2 = I B I REF = I C + 2I B = I C + 2I C β = I C 1 + 2 β I O = I C2 = I C I O = β β + 2 I REF = 1 1 + 2 β I REF ECEN 326 Electronic Circuits - Aydın ˙ I. Kar¸ sılayan - Current Mirrors 1
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Simple Current Mirror Simple Current Mirror Bipolar R o = r o2 = V A I C2 V O(min) = V CE2(sat) If the transistors are not identical: I O = I S2 I S1 I REF 1 1 + 1 + (I S2 / I S1 ) β Including the effect of Early voltage: I O = I S2 I S1 I REF 1 + V CE2 - V CE1 V A 1 + 1 + (I S2 / I S1 ) β ECEN 326 Electronic Circuits - Aydın ˙ I. Kar¸ sılayan - Current Mirrors 2
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Simple Current Mirror Simple Current Mirror MOS D1 I REF -V SS M 2 M 1 V DD I O I V GS1 = V t + v u u u u u t 2I D1 k 0 (W / L) 1 = V GS2 = V t + v u u u u
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current mirrors - ECEN 326 Electronic Circuits Current...

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