Patent ID: 6370365
Filing Date: 2002-04-09
Classification: H03D,H04B

Abstract:
A frequency translation circuit for use within a selective call radio for narrowband communications, comprising:a narrowband selectivity filter, an input of the narrowband selectivity filter coupled to an input signal having a first operating frequency and a plurality of undesired signals close in frequency to the first operating frequency, and an output of the narrowband selectivity filter generating a filtered signal, wherein the plurality of undesired signals are substantially attenuated in the filtered signal; and an integrated frequency conversion circuit coupled to the filtered signal, the integrated frequency conversion circuit incorporated into at least one IC (integrated circuit), the integrated frequency conversion circuit, comprising: an oscillator; a divider, an output of the oscillator coupled to an input of the divider; and a mixer, a first input of the mixer coupled to the filtered signal, a second input of the mixer coupled to an output of the divider, and an output of the mixer generating an output signal having a second operating frequency, the second operating frequency having a frequency value different from the frequency value of the first operating frequency.