Patent ID: 7558546
Filing Date: 2009-07-07
Classification: H03D

Abstract:
1. A method comprising the steps of: selecting one of a high-side mix mode and a low-side mix mode in response to an interference characteristic of a desired channel of a radio frequency (RF) input signal; in said high-side mix mode, initializing a direct digital frequency synthesizer to output a digital local oscillator signal at a first frequency suitable for performing a high-side mix of said desired channel to an intermediate frequency (IF), wherein said digital local oscillator signal is a multiple-bit digital representation of voltages of a sine wave; in said low-side mix mode, initializing said direct digital frequency synthesizer to output said digital local oscillator signal at a second frequency suitable for performing a low-side mix of said desired channel to said IF; and mixing said RF input signal with said digital local oscillator signal to provide an IF output signal at said IF.