hw7 - Tufts University, ECE Dept. Mar 24, 2008 EB 12:...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Tufts University, ECE Dept. Mar 24, 2008 EB 12: Homework # 7, Spring 2008 Due: Mar 31, 2008 1. For the series R—L—C network shown in the figure, find the: (a) expression for the complex impedance[Z(jw)]. (b resonant frequency where the impedance is only real. ) (c) Q of the network. ) (d draw approximate asymptotes of the magnitude and phase of the impedance versus frequency. 2. For the Wien—Bridge oscillator shown in the figure, the amplifier [Av(jw)] exhibits a phase shift (Ada of 0.1 rad in the neighborhood of can = 1 / RC . Find the new frequency of oscillation in this case. Hint: Find the phase sensitivity of 6(jw) in the neighborhood of we. 25w (Ito) V” R :0 3. For the Colpitt Oscillator shown in the figure: (a) Draw the small—signal model of the oscillator. Ignore To for the BJT. (b) Find the expression for the resonant frequency. (0) Find the expression for minimum fl and gm for the oscillation condition to be met. BE 12: Homework # 7 Page 2 of 2 4. The circuit shown is that of a version of Hartley Oscillator for which the small-signal analysis has been already done in the class. (a) Choose the resonator component values for a 1—MHz oscillator. (b) Choose the value of RE such that it is biased at IO = 1mA. (c) Use PSpice to simulate the oscillator and find the frequency of oscillation. Briefly state the reason for any deviation of the frequency of oscillation from the calculated one. Given Values: 01 = 270pF, Cc = 0.1/iF, Vcc 2 +9V, V66 2 —9V Note: The PSpice model for 2N2222A is provided on the web site in the homework section. Vac ...
View Full Document

This note was uploaded on 03/27/2008 for the course EE 12 taught by Professor Rout during the Spring '08 term at Tufts.

Page1 / 2

hw7 - Tufts University, ECE Dept. Mar 24, 2008 EB 12:...

This preview shows document pages 1 - 2. Sign up to view the full document.

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