Local oscillation generator, associated communication system and method for local oscillation generation

摘要

A local oscillation generator includes a multi-phase circuit and a multiplexer. The multi-phase oscillator provides a plurality of multi-phase oscillation signals of a same frequency and different phases. The multiplexer conducts one of the multi-phase oscillation signals to an output end in different time slots to provide an output oscillation signal. The frequency of the multi-phase oscillation signals is the same as a fundamental frequency, and the frequency of the output oscillation signal is different from the fundamental frequency. Thus, the local oscillation generator provides a local oscillation signal according to the output oscillation signal such that the fundamental frequency is different from the frequency of the local oscillation signal.

主权项

1. A local oscillation generator, applied to a communication system, for providing a local oscillation signal, the local oscillation generator comprising:
a multi-phase circuit, configured to provide a plurality of multi-phase oscillation signals having a same fundamental frequency and different phases; and a multiplexer, coupled to the multi-phase circuit, for continuously conducting one of the multi-phase oscillation signals in a plurality of adjacent time slots, respectively, to form an output oscillation signal, wherein the local oscillation generator provides the local oscillation signal according to the output oscillation signal, a synthesized frequency of the output oscillation signal is different from the fundamental frequency, a phase difference exists between two of the multi-phase oscillation signals conducted by the multiplexer in two adjacent time slots, and a ratio of the fundamental frequency to the synthesized frequency is equal to a ratio of the phase difference to 360 degrees.