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Midterm Exam 2 Solutions 08

2 2 ms 1 10 k b find the small signal parameters

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Unformatted text preview: s. , 2 , 2 mS 1 , , 10 kΩ b) Find the small-signal parameters of the BJT transistor ( gm , r0 , rπ ). [3pts] Since they’re biased identically in each circuit (once again, using the approximation that 1) the BJTs will have identical small-signal parameters. , , , 2.6 kΩ , , 1 S 26 , Page 8 10 kΩ c) From a) and b), find the relative magnitudes of small-signal parameters: [3pts] i) g m, BJT / g m, MOS ii) r0, BJT / r0,MOS iii) rπ , BJT / r0, BJT , (i) 19.23 , , (ii) 1 , , (iii) 0.26 , d) Derive the expressions of the output resistances for both cascade amplifiers shown above. You can drop small terms that are less than 10% of the dominant terms. Using the ratios you obtained in c), determine which cascode amplifier (Cascode-A or Cascode-B) has higher output resistance. [6pts] 1...
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