Patent ID: 6314145
Filing Date: 2001-11-06
Classification: H03J,H04L

Abstract:
Circuitry for receiving a transmitted signal, the transmitted signal comprising a modulated signal (TXMODSIGA) generated under the control of a transmit timing signal (TXC) of a first predetermined frequency and up-converted by a carrier frequency at a multiple n of the first predetermined frequency, the circuitry comprising:a signal source (42) for generating a receiver timing signal (RXC) of a second predetermined frequency;a frequency multiplier (44) having a multiply ratio of n and connected to receive as an input the receiver timing signal (RXC) and for generating a carrier reference signal (REFCARRIER) having a reference frequency of a multiple n of the second predetermined frequency;a down-converter (48) connected to receive as a first input the transmitted signal and as a second input the carrier reference signal (REFCARRIER), and for generating at an output an offset modulated signal (OFFRXMODSIGD) corresponding to the modulated signal (TXMODSIGA) offset by a frequency equal to the difference between the carrier frequency and the reference frequency,a frequency compensator (52) connected to receive as an input the offset modulated signal (OFFRXMODSIGD) and for generating at an output a difference signal having a frequency corresponding to the difference between the carrier frequency and the reference frequency;a frequency divider (54), having a divide ratio of n, connected to receive the difference signal and to generate at an output thereof an error signal having a frequency equal to the difference between the first and second predetermined frequencies;timing control means (56), connected to receive the error signal and for generating at least one timing control signal in dependence on the error signal;timing adjustment means (60) coupled to the output of the down-converter (48), and for adjusting the time phase of the output of the down-converter (48) responsive to said at least one timing control signal.