Tuner for radio frequency receivers and associated method
AssigneeSilicon Laboratories Inc.
InventorRichard A. Johnson
Life of this patent
Estimating the term…
Abstract
A tuner architecture is disclosed that mixes an analog RF input signal and a digital local oscillator signal to generate a output signal at a desired IF frequency, including low-IF and zero-IF solutions. The tuner provides a number of advantages over previous implementations, such as improved performance for low-IF and zero-IF architectures and a significant reduction in interference between adjacent paths in a multiple tuner solution. Other features and variations can be implemented, if desired, and related methods can be utilized, as well.
Claims46
A tuner comprising:
- a direct digital frequency synthesizer having an output terminal for providing a digital local oscillator signal having a frequency chosen to mix a channel to a desired frequency;
- and
- a mixer having a first input terminal for receiving a radio frequency signal, a second input terminal coupled to the output terminal of the direct digital frequency synthesizer, and an output terminal for providing an output signal at a desired frequency.
A method for tuning a signal comprising the steps of:
- generating a digital local oscillator signal having a frequency chosen to mix a channel to a desired frequency;
- receiving a radio frequency signal;
- and
- mixing the radio frequency signal with the digital local oscillator signal to provide an output signal at the desired frequency.
Dependencies are inferred from the claim text.