| 摘要 |
<p>The present invention relates to a method and a system for producing frequencies of a radio phone, in which a signal (fRx) received in a radio phone is admixed in a receiver part (10) with a mixer (12) with the aid of a mixing frequency (fLO1) produced in a frequency synthesizer (32, 33, 34) for a first intermediate frequency (fIF1), an intermediate signal (fIF1) is mixed with a second mixer (14) with the aid of a second mixing frequency (fIF2) for a second intermediate frequency (fIF2), and the intermediate signal transferred in a mixing part (20) is converted to a transmission frequency (fTx) with the aid of the frequency synthesizer (32, 21, 22). Another internal frequency of the radio phone, such as the clock frequency (fCHin) of a potential smart card, the bit and frame frequencies used in the trafficing between the phone and the base station, and the frequencies (fSig, fS1, fS2) used in signalling and speech processing are produced from a reference frequency fRef of a local oscillator (32) according to frequency equation fRef/K * (1 - I/N) where I, K and N are integers. <IMAGE></p> |
