Patent ID: 6304146
Filing Date: 2001-10-16
Classification: H03J,H03L

Abstract:
A frequency synthesizer for generating output signals in multiple bands of frequencies comprising:a phase locked loop having an output frequency operable within multiple bands of frequencies;a first controlled oscillator within the phase locked loop having an output frequency determined by a discretely controllable capacitance amount in combination with a continuously controllable capacitance amount; anda second controlled oscillator within the phase locked loop having an output frequency determined by a discretely controllable capacitance amount in combination with a continuously controllable capacitance amount;wherein the first controlled oscillator may be selected for a first frequency band and the second controlled oscillator may be selected for a second frequency band;wherein the first controlled oscillator comprises a first output node, wherein the second controlled oscillator comprises a second output node, and wherein either the first output node or the second output node may be selected to provide the output frequency for the phase locked loop; andwherein the first controlled oscillator comprises a plurality of first control input nodes, wherein the second controlled oscillator comprises a plurality of second control input nodes, and wherein each control input node of the first plurality of control input nodes is connected to one control input node of the second plurality of control input nodes.