System for demodulation of phase shift keying signals

A system for demodulation of phase shift keying signals, or PSK signals, of the type which comprises:

• a power divider (PDIV) with an input to be injected with a PSK signal at a predetermined frequency (2f) which is the same as the frequency of a carrier signal, and with an even number M of outputs, from which corresponding signals (i1 . . . iM) are obtained, one per output, at equal frequency (2f) and phase as said PSK signal,
• argument/frequency dividers (Div1 . . . DivM) equal in number (M) to said power divider outputs, each argument/frequency divider (Div1 . . . DivM) having an input respectively connected to one of said M output power divider outputs to receive said signals (i1 . . . iM) and having, each one, a natural tuneable resonant frequency (fr1 . . . frM) close to half said output power divider signals frequency (2f), and one output from which output signals (O1 . . . OM) are obtained, one per argument/frequency divider (Div1 . . . DivM), whose phases change differently from each other when a phase change in the PSK signal is produced, and
• an output stage with inputs connected at least to said argument/frequency dividers outputs, for treating their output signals (O1 . . . OM),
• wherein said output stage is adapted to isolate said argument/frequency dividers outputs in order to avoid mutual locking between said argument/frequency dividers (Div1 . . . DivM), for which it comprises at least M-1 devices (MixF1 . . . MixFM-1) acting at least as analogue multipliers providing at their outputs M-1 signals (F1 . . . FM-1) each of them containing at least harmonic components of one of the M-1 base-band signals which were used to modulate said PSK signal.