Modulators – Phase modulator – Including amplitude modulator
Patent
1994-08-22
1996-04-02
Pascal, Robert
Modulators
Phase modulator
Including amplitude modulator
332105, 333 81R, 333 81A, 333109, 330 54, 375308, 455 42, 455111, 455325, H03C 300, H01P 100, H01P 518, H04L 2720
Patent
active
055044654
ABSTRACT:
A multifunction microwave modulator circuit has an input signal splitter to provide two equal amplitude signal components. A phase quadrature relationship between the two signal components is obtained by constructing the splitter as a Lange coupler. There is pair of circuit cells, each of which operates separately on one of the two signal components to electronically adjust a vector representation of the signal to provide a vector having a desired amplitude, ranging over both positive and negative values of amplitude, including zero amplitude. The signal vectors of the two cells are combined by means of a Wilkinson combiner to provide an output signal represented by a resultant vector which may have any direction within 360 degrees, and an amplitude scale factor which varies from unity to zero. Each circuit cell has a Lange coupler with output terminals terminated with an impedance, such as back-biased transistors, variable in response to a control voltage to reflect power via a second input terminal to the Wilkinson combiner. The circuit may be operated in reciprocal fashion by applying an input microwave signal to the Wilkinson combiner and extracting the output signal from the Lange coupler of the power splitter.
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Albrecht, Jr. Bernard M.
Kennedy, II Andrew M.
Townley Elizabeth C.
Yung Ming L.
Kinkead Arnold
Pascal Robert
Space Systems Loral, Inc.
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