Demodulator and method for the demodulation of modulated RF signals
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United States of America Patent
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Oct 12, 2004
Grant Date -
N/A
app pub date -
Feb 11, 2000
filing date -
Jun 16, 1999
priority date (Note) -
Expired
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Abstract
A demodulator for modulated RF signals comprises a passive four port structure (1). The four port structure (1) has a first input (3) for supplying a modulated RF signal to be demodulated. A second input (2) is supplied with a RF signal from a local oscillator (21). Two output terminals are connected to power sensors (4, 5). The RF signal from the local oscillator (21) is supplied to the second input (3) of the four port structure (1) without being RF switched by an RF switch. The demodulator is particularly useful for modulation schemes with a finite number of magnitude states (nQAM modulation).
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