Spur Cancellation Systems and Related Methods

摘要

Spur cancellation systems and related methods are disclosed for radio frequency (RF) receivers and other implementations. Disclosed embodiments effectively remove spurs caused by digital clock signals or other spur sources by determining which spurs will fall within a channel selected to be tuned, utilizing a spur cancellation module to generate a cancellation signal, and subtracting this cancellation signal from the digital information. The cancellation signal can be initially generated with a known frequency and estimated values for unknown spur parameters, such as amplitude and phase. Digital feedback signals are then used to adjust the spur parameters. If the spur frequency is not known precisely, digital feedback signals can also be used to adjust the frequency of the cancellation signal. Where multiple receive paths are provided within a multi-receiver system, multiple spur cancellation modules can be used to remove spurs generated by digital clocks within each of the receive paths.

主权项

1. A spur cancellation system, comprising:
a digital processor configured to receive and process digital information associated with a channel within radio frequency (RF) input signals and to output digital data associated with the channel; a digital clock generator configured to output at least one digital clock signal to the digital processor based upon an oscillation signal; a spur cancellation module configured to generate a spur cancellation signal for a digital clock spur that falls within the channel, the digital clock spur being associated with the oscillation signal; and a combiner within the digital processor configured to subtract the spur cancellation signal from the digital information.