Lecture 12

Ee105 fall 2013 lecture 12 slide 7 prof ming c wu

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Unformatted text preview: False Cascodes ⎡ྎ ⎛ྎ 1 ⎞ྏ ⎤ྏ 1 Rout = ⎢ྎ1 + g m1 ⎜ྎ || rO 2 || rπ 1 ⎟ྏ ⎥ྏ rO1 + || rO 2 || rπ 1 gm2 ⎢ྎ ⎝ྎ g m 2 ⎠ྏ ⎥ྏ ⎣ྏ ⎦ྏ ⎛ྎ g ⎞ྏ 1 Rout ≈ ⎜ྎ1 + m1 ⎟ྏ rO1 + ≈ 2rO1 g m 2 ⎠ྏ gm2 ⎝ྎ §༊  When the emi+er of Q1 is connected to the emi+er of Q2, it’s no longer a cascode since Q2 becomes a diode- connected device instead of a current source. EE105, Fall 2013 L...
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This note was uploaded on 01/22/2014 for the course EE 105 taught by Professor King-liu during the Fall '07 term at Berkeley.

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