1. S. Mandayam/ ECOMMS/ECE Dept./Rowan University Electrical Communications Systems ECE.09.331 Spring 2008 Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/spring08/ecomms/ Lecture 14b April 30, 2008

2. S. Mandayam/ ECOMMS/ECE Dept./Rowan UniversityPlan Broadcast Receivers TRF Receiver Superheterodyne Receiver Taking Stock Course Outcomes Topics Timeline Let’s recall the most important concept in each topic Instructor/Course Evaluation

3. S. Mandayam/ ECOMMS/ECE Dept./Rowan University ECOMMS: Topics

4. S. Mandayam/ ECOMMS/ECE Dept./Rowan University Tuned Radio Frequency (TRF) Receiver Active Tuning Circuit Detector Circuit Local Oscillator Bandpass Filter Baseband Audio Amp

5. S. Mandayam/ ECOMMS/ECE Dept./Rowan UniversityHeterodyning Heterodyning (Upconversion/ Downconversion) Subsequent Processing (common) All Incoming Frequencies Fixed Intermediate Frequency

6. S. Mandayam/ ECOMMS/ECE Dept./Rowan University Superheterodyne Receiver RF Amplifier H 1 (f) Mixer Local Oscillator IF Amplifier H 2 (f) Detector Audio Amp Common tuning f RF or f c f LO f IF fmfm fmfm Downconversion f IF = |f RF - f LO | Upconversion f IF = f RF + f LO

7. S. Mandayam/ ECOMMS/ECE Dept./Rowan University Course Outcomes By the end of this course, the student will be able to – Identify and describe analog (AM and FM) and digital (Baseband and Bandpass) communications signals in the time and spectral domains. Calculate the spectrum, modulation index and efficiency of analog and digital communications signals in the time and spectral domains, using both software and hardware platforms. Design contemporary analog and digital communications systems and circuits, using both software and hardware platforms. Evaluate the noise performance of various analog and digital communications systems.

8. S. Mandayam/ ECOMMS/ECE Dept./Rowan University Let’s Recall The Most Important Concept in Each Topic

9. S. Mandayam/ ECOMMS/ECE Dept./Rowan University ECOMMS: Topics

10. S. Mandayam/ ECOMMS/ECE Dept./Rowan University ECOMMS Final Exam Monday, May 5 1:00 PM Rowan 204/206 ECOMMS Final Exam Monday, May 5 1:00 PM Rowan 204/206 Comprehensive Open Book/Notes

11. S. Mandayam/ ECOMMS/ECE Dept./Rowan University ECOMMS Spring 2008 INSTRUCTOR/COURSE Evaluation