Digital receiver
AssigneeMicrosoft Corporation
InventorsBradley John Morris, Arthur Thomas Gerald Fuller
Life of this patent
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Abstract
A receiver and method is provided for sigma-delta converting an RF signal to a digital signal and downconverting to a digital baseband signal. The RF signal is split into N phases, as can be accomplished using a sample and hold circuit, and each phase is digitized, as can be accomplished using an analog-to-digital (A/D) sigma-delta converter. Polyphase decimation techniques and demodulation are applied to the phased signals to generate a demodulated digital signal. The demodulated digital signal is further downconverted to the appropriate baseband signal.
Claims20
A receiver comprising:
- a sampler operable to separate a radio frequency signal into a plurality of phased analog signals, wherein the plurality of phased analog signals comprises N parallel phased analog signals, N being an integer multiple of 4, and wherein the sampler comprises a polyphase filter, the polyphase filter comprising N sub-filters, each sub-filter being operable to filter a respective analog signal of the plurality of phased analog signals;
- a sigma delta analog to digital converter system operable to convert the plurality of phased analog signals into a plurality of phased digital signals;
- and
- a digital downconverter operable to combine and downconvert the plurality of phased digital signals into downconverted digital signal.
A computer-implemented method comprising:
- sampling and separating a radio frequency signal into a plurality of phased analog signals, wherein the plurality of phased analog signals comprises N parallel phased analog signals, N being an integer multiple of 4, and wherein the sampling is based, at least in part, on a polyphase filter, the polyphase filter comprising N sub-filters, each sub-filter being operable to filter a respective analog signal of the plurality of phased analog signals;
- converting the plurality of phased analog signals into a plurality of phased digital signals using a sigma delta analog to digital converter system;
- and
- combining and downconverting the plurality of phased digital signals into downconverted digital signal.
Program instructions stored on hardware which, responsive to execution, cause the hardware to:
- separate a radio frequency signal into a plurality of phased analog signals, wherein the plurality of phased analog signals comprises N parallel phased analog signals, N being an integer multiple of 4, and wherein the sample comprises a polyphase filter, the polyphase filter comprising N sub-filters, each sub-filter being operable to filter a respective analog signal of the plurality of phased analog signals;
- convert the plurality of phased analog signals into a plurality of phased digital signals using a sigma delta analog to digital converter system;
- and
- combine and downconvert the plurality of phased digital signals into downconverted digital signal.
Dependencies are inferred from the claim text.