FM CARRIER WAVE DEMODULATION METHOD AND DEMODULATING CIRCUIT

摘要

PURPOSE: To enable demodulation of various carrier waves with different band widths and to simultaneously unnecessitate a use of different filters corresponding to respective necessary bands. CONSTITUTION: A PLL circuit 14 to demodulate a selected carrier wave is constituted to include a (programmable) variable gain circuit 40 to set a loop gain of the PLL circuit 14 as a desired value in it.