Patent ID: 7095274

Claim:
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 ( 2 f ) which is the same as the frequency of a carrier signal, and with an even number M of outputs, from which corresponding signals (i 1 . . . i M ) are obtained, one per output, at equal frequency ( 2 f ) and phase as said PSK signal, argument/frequency dividers (Div 1 . . . Div M ) equal in number (M) to said power divider outputs, each argument/frequency divider (Div 1 . . . Div M ) having an input respectively connected to one of said M output power divider outputs to receive said signals (i 1 . . . i M ) and having, each one, a natural tuneable resonant frequency (fr 1 . . . fr M ) close to half said output power divider signals frequency ( 2 f ), and one output from which output signals (O 1 . . . O M ) are obtained, one per argument/frequency divider (Div 1 . . . Div M ), 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 (O 1 . . . O M ), wherein said output stage is adapted to isolate said argument/frequency dividers outputs in order to avoid mutual locking between said argument/frequency dividers (Div 1 . . . Div M ), for which it comprises at least M-1 devices (MixF 1 . . . MixF M-1 ) acting at least as analogue multipliers providing at their outputs M-1 signals (F 1 . . . F M-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.