Multi-band direct sampling receiver

摘要

A radio signal reception technique includes selecting a sample rate from a plurality of predefined sample rates so that the radio signal is contained entirely within a Nyquist zone corresponding to the sample rate. The radio signal is passed through a selected one of a plurality of selectable bandpass filters to provide an analog signal. The analog signal is sampled at the sample rate and converted to a digital signal.

主权项

1. A method of receiving a radio signal wherein the radio signal is in any one of a plurality of different frequency bands, the method comprising:
passing a received signal through a selected one of a first set of bandpass filters to form a filtered signal in analog form, wherein the selected one of the first set of bandpass filters has a passband encompassing the received signal; sampling the filtered signal in analog form at a first sample clock rate to form a sampled analog signal; passing the sampled analog signal through a selected one of a second set of bandpass filters to form an interpolated signal; digitizing the interpolated signal at a second sample clock rate to form a digitized signal; and selecting the one of the first set of bandpass filters to pass a first frequency band corresponding to an nth Nyquist zone, wherein:
the first sample clock rate corresponds to the nth Nyquist zone, n is an integer, andthe sampling and the passing the sampled analog signal through the selected one of the second set of bandpass filters downconvert the interpolated signal to a second frequency band that is less than the first frequency band.