Patent ID: 8463205

Claim:
A transmitting apparatus operative in a plurality of bands, comprising: a modulator ( 110 ), for generating a modulated signal according to an intermediate frequency (IF) and a baseband signal; an IF filter ( 115 ), coupled to the modulator, for filtering the modulated signal to generate an IF signal; an offset phase-locked loop (OPLL) ( 120 ), coupled to the IF filter ( 115 ); and first ( 125 a ) and second ( 125 b ) frequency dividers coupled to an output of the OPLL ( 120 ), wherein the OPLL comprises a phase frequency detector ( 1205 ), for recceing an output of the IF filter ( 115 ), a loop filter ( 1210 ), for receiving an output of the phase frequency detector ( 1205 ), and a controllable oscillator ( 1215 ) coupled to the loop filter ( 1210 ) and configured to supply a transmitting signal to each of the first ( 125 a ) and second ( 125 b ) frequency dividers, wherein the OPLL further comprises a feedback circuit connected between an output of the controllable oscillator ( 1215 ) and the phase frequency divider ( 1205 ), the feedback circuit comprising an offset mixer ( 1230 ) having as inputs outputs, respectively, of a third ( 1220 ) frequency divider and a fourth ( 1225 ) frequency divider, wherein the third ( 1220 ) frequency divider is configured to receive the transmitting signal and the fourth ( 1225 ) frequency divider is configured to receive a local oscillator signal, and a frequency dividing circuit ( 1240 ), for receiving an output 3 from the offset mixer ( 1230 ) and for providing a feedback signal to the phase frequency detector ( 1205 ), the frequency dividing circuit ( 1240 ) having a switch selectable first path and second path, the first path including a fifth ( 12405 ) frequency divider and the second path configured to bypass the fifth frequency divider, and wherein divisors of the first-fifth frequency dividers are constants.