Zero intermediate frequency radio for cellular phones has single chip with main and auxiliary phase locked oscillator loops designed with loop reference frequency to avoid parasitic signals

摘要

A zero IF (Intermediate Frequency) radio has a single chip (PC) with main phase locked loop (PLL2) reference frequency from a lower frequency voltage controlled auxiliary phase locked loop (PLL1) and main loop reference frequency (SRFP) below the main oscillator frequency, ten times higher than the channel frequency spacing and separated by an integer multiple of the transmit / receive frequency (SRFA) from the main loop cut off frequency. Includes an Independent claim for the use of the component in a cellular mobile phone.