DETECT CIRCUIT OF JAMMING FREQUENCY OF CODE DIVISION MULTIPLE ACCESS SYSTEM

摘要

PURPOSE: A detect circuit of jamming frequency of code division multiple access (CDMA) system is provided so that the frequency band of jamming can be detected more precisely by only inputting the pure jamming component deleted CDMA component to a phase-locked loop, thereby outputting the exact jamming frequency. CONSTITUTION: A detect circuit of jamming frequency of code division multiple access (CDMA) system includes a band pass limiter (130) for outputting the pure narrow band jamming component by removing CDMA component from the output signal of the band pass filter (120). A phase-locked loop (140) outputs a jamming frequency by inputting the output signal of the hard band pass limiter (131).