Demodulation structure and method
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United States of America Patent
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Apr 20, 2004
Grant Date -
Oct 18, 2001
app pub date -
Jan 22, 2001
filing date -
Jan 24, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a demodulation structure and method for downconverting and demodulating a digitally modulated signal S.sub.o, with a local oscillator means (1; 5; 8) for providing a local oscillator signal S.sub.lo a mixer means (2) for mixing said local oscillator signal S.sub.lo and said digitally modulated signal S.sub.0 in order to obtain a mixed signal, a lowpass filter means (3) for lowpass filtering the mixed signal from the mixer means (2) and an analog-to-digital converting means (4) for converting the filtered signal from the lowpass filter means (3) into a downconverted and demodulated digital signal S.sub.l, whereby the local oscillator signal is set in respect to the modulated digital signal so that the downconverted and demodulated digital signal output from the analog-to-digital converting means comprises to serially arranged information parts. The present demodulation structure provides a very simple structure with improved amplitude and phase imbalances.
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