公开(公告)号：EP1844544A2

公开(公告)日：2007-10-17

申请号：EP05809116.6

申请日：2005-10-07

申请人： Groupe de Ecoles de Telecommunications Ecole National Superieure des Telecommunications

发明人： HUYART, Bernard ,  RANGEL DE SOUSA, Fernando

IPC分类号： H03D9/04

CPC分类号： H04B1/30 ,  H03D7/125

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 (3a, 3b, 3c) 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 (4a, 4b, 4c) 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.