HW_18 - EE 438 Homework #18 1. The small-signal equivalent...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
EE 438 Homework #18 1. The small-signal equivalent circuit of the common-emitter amplifier shown in Fig. 1 on page 4 is given below. _ + V i R i C µ C π g m V π V C 1 R B C R V o + _ c b e The elements in the equivalent circuit have the following values. . fF 20 and pF, 10 , k 2 || , mS 40 F, 2 , k 4 || || , 1 1 2 1 = = = = = = = = = C C r R R g C r R R R k R o C C m B B B i (a) Use the low frequency approximation ( C and C open-circuited) to determine A vl ( s ) in the ( s +1/ T ) form with all constants, including A mid , expressed as numerical values. (b) Using the high frequency approximation ( C 1 shorted) we find that A vh ( s ) is given by () () ( ) [] {} () 2 || 1 || 1 1 s C C R R R s C C R g R R C R s g C A s A C i B C m i B C m mid µ + + + + + = . Solve the denominator quadratic to express A vh ( s ) in the + T s / 1 1 form with all constants, including A mid , expressed as numerical values. (c) Combine A vl ( s ) and A vh ( s ) to form A v ( s ) with all constants evaluated numerically. 2. Draw a small signal equivalent circuit of the common-drain amplifier shown in Fig. 2 on page 4. Include the two device parasitic capacitors C gs and C gd (do not include C gb and C db ) in your circuit. Indicate the locations of V i and V o and the transistor terminals. Do not analyze the circuit . 3. Next Page
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Page 2 3. + _ + R i R G 1 R G 2 R D V DD V i V o _ C 1 ZVN3306A Construct the circuit shown above in the Multisim simulator. Use the values. V.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/26/2009 for the course EE 438 taught by Professor Cardwell during the Spring '08 term at University of Texas at Austin.

Page1 / 4

HW_18 - EE 438 Homework #18 1. The small-signal equivalent...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online