Lecture 12

Ming c wu 2 maximum bipolar cascode output impedance

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Unformatted text preview: 2 || rπ 1 Rout ≈ g m1rO1 (rO 2 || rπ 1 ) I C 2 = I E1 ≅ I C 2 if β1 >> 1 §༊  VCE for Q2 can be as low as ~ 0.4V (“soL satura0on”) EE105, Fall 2013 Lecture 12 – Slide 4 Prof. Ming C. Wu 2 Maximum Bipolar Cascode Output Impedance Rout ,max ≈ g m1r01rπ 1 Rout ,max ≈ β1r01 §༊  The maximum output impedance of a bipolar cascode is bounded by the ever- present rπ between emi+er and ground of Q1. EE105, Fall 2013 Lecture 12 – Slide 5 Prof. Ming C. Wu PNP Cascode Stage Rout = [1 + g m (r02 || rπ 1 )]r01 + r02 || rπ 1 Rout ≈ g m1r01 ( r02 || rπ 1 ) EE105, Fall 2013 Lecture 12 – Slide 6 Prof. Ming C. Wu 3...
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