cascode_ota_noise

cascode_ota_noise - cascode_ota_noise.mcd...

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cascode_ota_noise.mcd 1/21/2011 Reference:C:\CHIU\analysis\defaults.mcd Thermal Noise of Cascode OTA C X V o V i M1 M2 C L ß v g v X openloop ( i n1 and i n2 model the thermal noise from M1 and M2): Given g m1 v g g m2 v x sC x v x i n1 i n2 0 = g m2 v x L v o i n2 0 = Find v o v x  g m2 g m1 v g g m2 i n1 i n2 x L g m2 x g m1 v g i n1 i n2 g m2 x v o g m1 L 1 1 x g m2 v g i n1 g m1 x g m2 i n2 g m1 = feedback: v g v o = v o 1 1 s 2 3dB p 2 s 3dB 1 i n1 i n2 s p 2 g m1 = with u g m1 C L = 3dB  u = p 2 g m2 C x = 1

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cascode_ota_noise.mcd 1/21/2011 closed-loop response: o 3dB p 2 = v o 1 o 2 s 2 s o Q  o 2 i n1 i n2 s p 2 g m1 = Q 3dB o =
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cascode_ota_noise - cascode_ota_noise.mcd...

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