Patent ID: 7245889

Claim:
A signal source (S) comprising a local oscillator ( 5 ) for generating a reference frequency signal f, characterized in that it comprises: a frequency divider by N ( 6 ) connected to the local oscillator ( 5 ) and intended to deliver two quadratic square-wave signals (Id, Qd) at a frequency fo/N,N being equal to 2 or 4·n, n being an integer number, and a polyphase filter ( 7 ) connected directly to the frequency divider ( 6 ) for receiving said two quadratic squre-wave signals and for supplying two sinusoidal quadratic signals (Is, Qs) at a frequency equal to m·fo/N on the basis of the quadratic signals (Id, Qd) issued by the frequency divider ( 6 ), in being an odd number.