Patent ID: 7928805
Filing Date: 2011-04-19
Classification: H03L

Abstract:
1. A broadband frequency synthesizer including in a phase-lock loop: a voltage controlled oscillator for providing at least one high frequency output signal within a determined frequency band, a dual mode divider circuit for dividing the output signal frequency by a first factor N a means for selecting a division mode of the divider circuit for selecting by a determined time period a first division mode or a second division mode of the divider circuit in order to define a mean of first division mode M a phase detector for comparing a reference frequency signal to the divided frequency signal provided by the divider circuit, and a low-pass filter for filtering the output signal of the phase detector to provide a filtered control signal to the voltage controlled oscillator, wherein when the frequency of the output signal is close to the centre of the frequency band defined by the first and second division factors N