Patent ID: 7283002

Claim:
A phase locked loop with a modulator, comprising: a forward path, comprising: a phase comparator comprising a first input configured to receive a signal at a reference frequency, and a second input; a controlled oscillator comprising a control input coupled to an output of the phase comparator; and a frequency divider comprising a signal input connected to an output of the controlled oscillator, and an output that forms a signal output for the phase locked loop, and configured to provide a signal thereat at an output frequency, and comprising at least three further outputs, each configured to output respective signals at the output frequency that are phase-shifted with respect to the signal output; a feedback path, comprising: a multiplexer comprising a plurality of inputs each connected to a respective output of the frequency divider, an output, and at least one control input; and a multimodulus divider comprising an input connected to the output of the multiplexer, an output connected to the second input of the phase comparator, and comprising at least one control input for preselecting the division ratio associated therewith; and a control unit coupled to the control inputs of the multiplexer and the multimodulus divider, the control unit comprising a sigma-delta modulator.