Patent ID: 8704562
Filing Date: 2014-04-22
Classification: H03L

Abstract:
1. An apparatus for providing an output signal, the apparatus comprising: an input for receiving a reference signal; an oscillator for providing an output signal; an offset signal generator for frequency multiplying the reference signal to generate an offset signal, the offset signal containing a plurality of offset frequencies at harmonics of the reference signal; a mixer for mixing the offset signal with the output signal to produce a combined signal, a difference detector for detecting a phase difference between the reference signal and the combined signal to provide a control signal based on the detected difference the control signal containing a plurality of control signal frequencies at harmonics of the reference signal, the plurality of control signal frequencies corresponding to the plurality of offset frequencies, each of the plurality of control signal frequencies contained within a respective frequency band; and an offset frequency selector for controllably selecting any one of the respective frequency bands of the control signal to select any one of the plurality of control signal frequencies to control the oscillator, such that the output signal is at a predetermined frequency.