Phase shifter for directly sampled bandpass signals

Details Phase shifter for directly sampled bandpass signals Phase shifter for directly sampled bandpass signals

1994-03-31

1995-04-25

Mai, Tan V.

Boots, shoes, and leggings

364825, G06F 1531, G06G 702

Patent

active

054104998

ABSTRACT:
A phase shifter for shifting the phase of directly sampled bandpass signals ithout having to convert to complex (I,Q) form is disclosed. An application requiring a plurality of appropriately phase shifted signals is a phased array antenna. In the operation of an exemplary phase shifter, a sequence of directly sampled data is passed into an exemplary three-stage storage unit to sequentially store r.sub.n+1, r.sub.n and r.sub.n-1 data samples. The r.sub.n sample is multiplied by cos .phi. to develop an r.sub.n cos .phi. signal, where .phi. is the desired phase shift angle. At the same time, the r.sub.n+1 and r.sub.n-1 data samples are subtracted from each other and the result is multiplied by w.sub.1 sin .phi. to develop the value w.sub.1 (r.sub.n+1 -r.sub.n-1)sin .phi.. This value is added to r.sub.n cos .phi. to produce an estimated sample value r.sub.n ', which is approximately equivalent to data directly sampled from a signal phase-shifted by .phi..

REFERENCES:
patent: 4468794 (1984-08-01), Waters et al.
patent: 5140613 (1992-08-01), Birgenheier et al.
patent: 5142553 (1992-08-01), Rosenkranz
patent: 5325204 (1994-06-01), Scarpa

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