| 摘要 |
The demodulator by direct frequency conversion comprises a vector addition device having: a first circuit ( 1 ) that furnishes, starting from a first AC signal (LO), a respective AC signal to n outputs that are not all of the same amplitude and of the same frequency, but are out of phase with regard to one another in such a manner that each one is not either in phase nor in opposite phase with any other; a second circuit ( 2 ) that splits a second AC signal (RFin) toward n outputs; a number n of summers ( 3 a , 3 b , 3 c) each receiving, at the input, a respective output of the first circuit ( 1 ) and a respective output of the second circuit ( 2 ), and; a respective power sensor ( 4 a , 4 b , 4 c) for each summer, whereby the number n is greater than or equal to 3 . The demodulator also comprises digital processing means ( 5, 6 ) that furnish the result of the demodulation.
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