RECEIVER CIRCUIT

摘要

PROBLEM TO BE SOLVED: To improve the interfering wave removing characteristics of a receiver circuit and to reduce the size of the circuit by constituting a mobile object communication equipment dealing at least with two systems of a small-sized crystal filter instead of a large SAW filter conventionally used for an IF filter and inputting the output of a 1st IF filter to a 2nd IF filter having a pass band wider at least than that of the 1st IF filter. SOLUTION: The receiver circuit is provided with a 1st change-over switch 16, a 1st IF filter 17 connected to one of the output terminals of the switch 16, a 2nd change-over switch 19 connected to the output terminal of the filter 17 connected to the other output terminal of the switch 16 and a 2nd IF filter 18 connected to the output terminal of the switch 19 and constituted so that the pass band width of the filter 17 is narrower than that of the filter 18.