Low IF mixer with improved selectivity performance
AssigneeAgere Systems Inc.
InventorsEdward Campbell, Syed Aon Mujtaba
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Abstract
A low IF mixer and method for down-converting a signal at a desired frequency are disclosed with improved selectivity performance. The energy of sidebands on each side of the desired frequency is evaluated; and a local oscillator frequency is selected based on the evaluation of the energy. Generally, the local oscillator frequency associated with the sideband having a lower energy is selected. The desired frequency may have a frequency of RF and the sidebands have a frequency of the desired frequency plus or minus an offset frequency (RF+IF or RF−IF). The signal at the desired frequency may be multiplied by the selected local oscillator frequency to down-convert the signal.
Claims20
A method for down-converting a signal at a desired frequency, comprising the steps of:
- evaluating an energy of sidebands on each side of said desired frequency;
- and
- selecting a local oscillator frequency based on said evaluation of said energy.
A low IF mixer, comprising:
- a port for receiving a signal at a desired frequency;
- a multiplier for multiplying said received signal at a desired frequency by a local oscillator frequency, wherein said local oscillator frequency is selected based on an evaluation of interference in sidebands on each side of said desired frequency.
A receiver in a wireless network, comprising:
- an antenna for receiving a signal at a desired frequency;
- and
- a low IF mixer having a multiplier for multiplying said received signal at a desired frequency by a local oscillator frequency, wherein said local oscillator frequency is selected based on an evaluation of interference in sidebands on each side of said desired frequency.
Dependencies are inferred from the claim text.