hw04 - ECE 488: RF Circuits and Systems Spring 2009...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
ECE 488: RF Circuits and Systems Spring 2009 HOMEWORK 4: Mixer Frequencies, Class-C Amplifers, and AC-DC Supplies Re±erence: Lectures 7-10; Chapters 4–8 , 11 Due: February 18 Problem 1: Do Problem 1 of Hagen’s Chapter 6. Specify the upper and lower frequency limits. [10 points] Problem 2: Do Problem 1 of Hagen’s Chapter 10. Since answers are given, be especially careful to show your work. [20 points] Problem 3: A 10 kW AM transmitter is operating at a 20% modulation level. [18 points] a. What is the peak power being transmitted? b. What is the average power being transmitted? c. If an 80% eFcient Class-C ±nal ampli±er is used with a class-B driver con±gured for full 100% modulation of the output, estimate the AC power required to supply the system when operating at only 20% modulation. You may assume the AC to DC converters are 100% eFcient. Hints: See Hagen’s Problem 1.b of Chapter 3, Hagen’s section on “High-Level Modulation” on pages 100–102 and ²igure 11-5 on page 102.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/01/2009 for the course ECE 488 taught by Professor Swartz during the Summer '08 term at Cornell University (Engineering School).

Ask a homework question - tutors are online