Tuner suitable for integration and method for tuning a radio frequency signal

摘要

A tuner ( 200 ) includes a direct digital frequency synthesizer ( 206 ) and a mixer ( 220 ). The direct digital frequency synthesizer ( 206 ) has an output terminal for providing a digital local oscillator signal having a frequency chosen to mix a desired channel to baseband. The mixer ( 220 ) has a first input terminal for receiving a tuned radio frequency signal, a second input terminal coupled to the output terminal of the direct digital frequency synthesizer ( 206 ), and an output terminal for providing an in-phase baseband signal.