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# assign 7 - in and R out d Determine the value of the...

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1 ECED3201: Introduction to Electronics Fall 2008 Dalhousie University, Department of Electrical and computer Engineering Assignments #7 1- For the circuit in Fig. 1, called a bootstrapped follower: a) Find the dc emitter current and g m , r e , and r . Use = 100 and V BE =0.7V. b) Replace the BJT with its T model (with r o = ), and analyze the circuit to determine the input resistance R in and the voltage gain v o / v sig . c) Repeat (b) for the case when the capacitor C B is open circuited. Compare the results with those obtained in (b) to find the advantages of bootstrapping. Fig. 1 2- The circuit below is designed for a small signal gain ° ? = ± ? ± ² = 0.8V/V. Assume = 100 and I S = 6.95×10 -16 A, V T =25mV, and V A = for Q 1 a) Is this amplifier is common emitter, common base or emitter follower? Justify your answer. b) Derive the expression of the gain ° ? . c) Derive the expressions of the input and the output resistances R

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Unformatted text preview: in and R out . d) Determine the value of the resistance R B and verify that Q 1 is operating in active region. 2 R B v i v O V CC Q 1 R out R in R E = 500 W +- Fig. 4 3-For the circuit shown in Fig.3, assume ° ? ′ =50 A/V 2 , ° ? ′ =100 A/V 2 , ± ² 1 = ± ² 2 =1V , ? 1 ³ 1 = 36, ? 2 ³ 2 = 12, and V A = . (hint: ° ? ′ , ± ² 1 , and ? 1 ³ 1 are for M 1 and ° ? ′ , ± ² 2 , ? 2 ³ 2 are for M 2 ). +6V +6V +6V R 5 = 3k W M 1 R 3 = 8k W R 4 = 8k W R 1 = 50k W R 2 = 50k W M 2 Fig. 3 a) Find the DC drain currents ( I D1 and I D2 ) and verify the operating regions of the transistors M 1 and M 2 . Due date: Please be informed that submitting of this assignment is mandatory and its mark will be taken into consideration for the assignments ’ final mark. Due date: November 18, 2008. Late submission will not be accepted ....
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## This note was uploaded on 02/12/2011 for the course ECED 3201 taught by Professor Al-sankary during the Spring '11 term at Dalhousie.

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assign 7 - in and R out d Determine the value of the...

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