Abstrait

Modeling and Performance Evaluation of a Superheterodyne Receiver

Ezeagwu C.O, Ufoaroh S.U, Nnebe S.U, Nwalozie Gerald.C

There have been high rate of interference between radio stations due to the recent increase in the number of radio stations. This interference leads to poor sound quality of a simple AM/FM receiver. Research has shown that the use of wrong component and poor ICs are the causes of this interference and other drawbacks of a receiver system. These drawbacks include but not limited to cross modulation, local oscillator radiation and blocking. This research work models and evaluates a highly integrated FM/AM radio single-chip receiver optimized for low power consumption and minimum external components, with the operating frequency of 88 MHz - 108 MHz and 550kHz -1600 kHz which covered the standard FM and AM bands respectively. The single-chip receiver also eliminates the drawbacks of the regular receivers, with good selectivity, sensitivity, proper inter-modulation (IM) rejection and audio amplifier. Multisim software is used for the circuit design and performance evaluation of the proposed receiver.