Phase shift network with minimum amplitude ripple

Details Phase shift network with minimum amplitude ripple Phase shift network with minimum amplitude ripple

1984-05-30

1986-04-08

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

333 81R, 333156, 333138, H03H 720

Patent

active

045815950

ABSTRACT:
An improved phase shift network is disclosed which is applicable to broadband systems, particularly in connection with feedforward power amplifier systems. The phase shift network includes a splitter for receiving an input signal and providing outputs which are coupled through all pass networks to produce signals differing in phase by a predetermined angle. The signals from the all pass networks are coupled through variable attenuators having their outputs recombined in a combiner to produce an output representing the input signal phase shifted by a predetermined angle. The phase shift may be adjusted by changing only one variable attenuator at a time to produce phase shifts of 90.degree. or greater.

REFERENCES:
patent: 4161705 (1979-07-01), Nemit et al.
patent: 4224583 (1980-09-01), Larkin
patent: 4297641 (1981-10-01), Sterzer

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