Managing spurs in a radio frequency circuit

摘要

In some embodiments, an integrated circuit may include a radio frequency synthesizer configured to provide a local oscillator (LO) signal at a selected frequency related to a frequency of interest. The integrated circuit may also include a re-clocking circuit having a first input to receive a clock signal having a first frequency, a second input to receive a local timing signal related to the LO signal, and an output. The re-clocking circuit may be configured to provide a local timing output signal that is a frequency adjusted version of the clock signal based upon the local re-clocking signal. The integrated circuit further may include a digital circuit including an input to receive the local timing output signal as a digital clock signal in a receive mode.

主权项

1. An integrated circuit comprising:
a radio frequency synthesizer configured to provide a local oscillator (LO) signal at a selected frequency related to a channel of interest within an radio frequency (RF) input signal; and a re-clocking circuit including a first input to receive a clock signal, a second input to receive a local re-clocking signal related to the LO signal, and an output to provide a timing output signal, the timing output signal being a selected one of the clock signal and a local timing output signal corresponding to a frequency adjusted version of the clock signal based upon the local re-clocking signal; a control circuit configured to determine a mode and to selectively control the re-clocking circuit to provide the selected one of the local timing output signal and the clock signal to the output as the local timing output signal; and a digital circuit including an input to receive the selected one of the local timing output signal and the clock signal as a digital clock signal.