ECE 4700 Midterm: ECE4700 Wayne State Exam SolutionsW2004M2

• School: Wayne State University
• Department: Electrical and Computer Engineering
• Course: ECE 4700
• Professor: All

Document Summary

20 point each: determine the efficiency and the output spectrum for an am modulator operating with a modulation index of 0. 5. The carrier power is 50w and the message signal is m(f)= cos[2 fmt] + 2cos[4 fmt]. Assume carrier frequency 1 khz: given the following ssb demodulator shown in figure p2a: Choose the carrier frequency fc to get the output signals f1 (t) and f2 (t) shown in figure p2b. Sketch the signals in fourier domain (identify the frequency limits and its corresponding magnitude: a mixer is used in a short-wave super heterodyne receiver. The receiver is designed to receive transmitted signals between 5 and 25 mhz. Determine the tuning range of the local oscillator for if frequencies varying between 400 khz and 2 mhz.