Method and device to phase shift low distortion electrical signals

摘要

In addition to a local oscillator first signal (fol), it is generated a local oscillator second signal (fol') derived from said first signal but phase shifted of a selectively determined phase shifting value ( phi ). The input signal (f1) and the local oscillator first signal (fol) are mixed (2) between them and the beating signal so obtained is filtered (8) to select one of the components of the beating signal included between the component at sum frequency (fol+f1) and the component at difference frequency (fol-f1) of the signals subjected to beating. The selected component is submitted to mixing (9) with the local oscillator second signal (fol') so to generate a second beating signal. This last signal is filtered in turn to extract the component corresponding to the frequency of the input signal (f1). The component of the second beating signal so extracted (f1') represents a replica of the input signal (f1) duly phase shifted of the above mentioned phase shifting value ( phi ).