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Unformatted text preview: Q 1 has =50, and I S = 6.9510-16 A, and V T =25mV. Also consider Q 1 operates in active region and r o = . a. [4 pt] Calculate the voltage V BE and the current I C . b. [3 pt] Calculate the small signal input resistance R i . c. [3 pt] Calculate the small signal gain A V = v o / v i . 2 d. [4 pt] Propose a modification to the circuit in the dashed box without changing the DC operating point ( I C and V BE ) in order to obtain a gain A V1 = v o / v i =2x A V and verify that the input resistance is not reduced by more than 50%. (Hint you will find (a) V BE = 654.6 mV, (c) A v =-4.53 V/V ) v O Q 1 +5V R E = 500 W R C = 3k W +5V R 1 = 400k W R 2 = 100k W v i +- R i Fig. 2 Due date: November 19, 2009. Late submission will not be accepted....
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- Spring '11