Gopalan_Ramasamy_Report

Gopalan_Ramasamy_Report - Design of an FM Rx without...

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Design of an FM Rx without causing Interference Ramasamy Gopalan Dept of ECE University of Florida Gainesville, FL 32601 USA Abstract- As part of the course work of EEE6374, a commercial FM receiver in the 88-108 MHz bandwidth has been designed that does not cause interference to other FM radios. A dual IF heterodyne architecture has been designed to meet the objective. The designed receiver has been simulated in ADS to verify the performance. The performance parameters like NF, IIP3, etc., for the overall receiver has been calculated using Syscalc. Also, a number of different architectures have been given to meet the objective. I . I NTRODUCTION FM Broadcasting is one of the oldest radio communication systems. It is an analog modulation system. The FM band is 88-108 MHz in the USA, Europe and Asia (except Japan). A lot of commercial FM Radio receivers are available in the market. But these receivers cause interference to other nearby FM radios in their vicinity. This interference (jamming) happens to a channel tuned to exactly a difference of 10.7 MHz. The 10.7 MHz is the Intermediate Frequency (IF) used universally in the FM radios. In this paper, an architecture for an FM receiver is designed that does not cause interference to other FM radios. The main approach for all architectures has been to eliminate to eliminate the 10.7 MHz IF. Since the interference to other FM radios is caused at the IF, a dual IF architecture has been proposed. The first IF has been set to 32.7 MHz to eliminate the interference problem and the second IF is the normal 10.7 MHz. A lot of other architectures have also been proposed that do not cause interference. Calculations have been done for a ll architectures, however, the Rx system parameter calculations have been shown here only for the dual IF architecture using Syscalc. Simulation using ADS has been done only for Dual IF architecture.
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