Continuously variable electronically controlled phase shift circ

Details Continuously variable electronically controlled phase shift circ Continuously variable electronically controlled phase shift circ

1992-12-15

1994-05-31

Grimm, Siegfried H.

Modulators

Phase modulator

307262, 332146, 333 81R, 333139, 455110, H03C 300, H03C 340, H03H 720

Patent

active

053172884

ABSTRACT:
A variable electronically controlled phase shift circuit including a phase splitter stage including a 90 degree phase divider to split an RF input signal into 0 and 90 degree components. Each split signal is further split into two pairs that are displaced in phase by 180 degrees to provide, 0 degree, 180 degree and degree, 270 degree pairs. Four signals of the signal pairs are applied to a phase controller subcircuit wherein one of each of the two signal pairs may be attenuated by a control signal. The signal pairs from the phase controller sub-circuit are then summed and the summed pairs are combined into a single output signal. The phase of the output signal is controlled by varying the relative amplitudes of at least one of the component signals of the 0 degree, 180 degree and 90 degree, 270 degree pairs by means of the control signals on the phase control sub-circuit.

REFERENCES:
patent: 4161705 (1979-07-01), Nemit et al.
patent: 4549152 (1985-10-01), Kumar
patent: 4862116 (1989-08-01), Olver
patent: 4970519 (1990-11-01), Minnis et al.

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