Direct conversion radio receiver using combined down-converting and energy spreading mixing signal
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United States of America Patent
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Sep 3, 2002
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N/A
app pub date -
Apr 30, 1999
filing date -
Apr 30, 1999
priority date (Note) -
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Abstract
A receiver (54) comprising an input for receiving an RF signal (FIG. 7) centered at a first frequency and having a bandwidth. The receiver also comprises a first mixer (62) for producing a first output signal. The first output signal results from mixing the RF signal with a signal having an energy spreading portion (p(t)) and a down-converting portion (c(t)). Moreover, this first output signal comprises a self-mixing DC signal (c(t)p(t) self-mixing DC component) and a down-converted and energy spread RF signal (FIG. 11). The receiver further comprises a second mixer (70) for producing a second output signal by mixing a signal responsive to the first output signal with the energy spreading portion of the signal. The second output signal comprises two signals, namely: (1) a baseband signal (down-converted RFA.sub.1) responsive to the down-converted and energy spread RF signal; and (2) a portion of the spread DC signal (spread DC).
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