Patent ID: 6526265
Filing Date: 2003-02-25
Classification: H03C,H03L,H04L

Abstract:
A transmitter comprising:a voltage-controlled oscillator (VCO) that generates a transmit signal having a frequency fTx; a modulated signal source that generates an LO signal modulated with audio or data information, the modulated signal having a frequency fLO; a mixer that mixes the transmit signal with the LO signal to produce an IF signal having a frequency fIF; a first divider that divides the LO signal frequency fLO by an integer M to generate a first comparison signal having a frequency fCF; a second divider that divides the IF signal frequency fIF by an integer N to generate a second comparison signal having a frequency fCF; and a phase detector coupled to the first and second comparison signals that compares the phases of the signals and outputs a control voltage to the VCO proportional to any phase differences between the signals, wherein when fLO>fTx, the relationship between the transmit and LO signal frequency is expressed as fTx=fLO&it;M-NM,â€ƒand when fLO Tx, the relationship between the transmit and LO signal frequency is expressed as fTx=fLO&it;M+NM&CenterDot;