Modeling and Performance Evaluation of aSuperheterodyne Receiver

[摘要] 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.

[关键词] Superheterodyne;sensitivity;selectivity