Patent ID: 7269228

Claim:
A non-coherent frequency shift keying transmitting circuit for up-converting a baseband signal to a radio frequency signal , comprising: a micro processing unit, for receiving said baseband signal and generating a digital signal sequence corresponding to said baseband signal; a frequency synthesizer using interpolation and a linear feedback shift register, coupled to said micro processing unit, for synthesizing said digital signal sequence to a plurality of synthesized signals; a first oscillator, coupled to said frequency synthesizer, for up-converting said plurality or synthesized signals to an intermediate frequency signal; a first filter, coupled to said first oscillator, for removing a noise of said intermediate frequency signal; a digital-analog converter coupled to said first filter; a second oscillator, coupled to said digital-analog converter, for up-converting to the radio frequency signal; a second filter, coupled to said second oscillator, for removing a noise of said radio frequency signal; and a power amplifier coupled to said second filter.