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US 7,548,742 B2Granted
Tuner for radio frequency receivers and associated method
AssigneeSilicon Laboratories Inc.
InventorRichard A. Johnson
Life of this patent
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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 an analog radio frequency signal, a second input terminal coupled to the output terminal of the direct digital frequency synthesizer for receiving the digital local oscillator signal, and an output terminal for providing an analog output signal at a desired frequency said mixer mixing the analog radio frequency signal with the digital local oscillator signal for providing the analog output signal.
A method for tuning a signal comprising the steps of:
- generating a digital local oscillator signal using a direct digital frequency synthesizer having a frequency chosen to mix a channel to a desired frequency;
- receiving an analog radio frequency signal;
- and
- mixing the analog radio frequency signal with the digital local oscillator signal to provide an analog output signal at the desired frequency.
1 more element
Dependencies are inferred from the claim text.