Modulators – Phase shift keying modulator or quadrature amplitude modulator – Including discrete semiconductor device
Patent
1994-08-29
1995-06-27
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
Including discrete semiconductor device
375282, 375308, H04L 2720
Patent
active
054283205
ABSTRACT:
A biphase modulator without matching elements includes a Lange coupler (5) including first, second, third, and fourth ports (1,2, 3, 4), where the first port (1) receives a RF input signal. FETs (6, 7) each have a source, gate, and drain (19, 17, 18 and 22, 20, 21). The drain (18) of the first FET (6) is coupled to the second port (2), the source (19) of the first FET (6) and the second FET (7) are coupled to electrical ground, and the drain (21) of the second FET (7) is coupled to the fourth port (4). The FETs, are switched at the desired modulation frequency by a control input (16) to the gates (17, 20), alternately providing a zero volt signal and a pinch-off voltage signal which produces a biphase modulated RF input signal at the third port (3) of the Lange coupler (5).
REFERENCES:
patent: 4276521 (1981-06-01), Davidheiser
patent: 4355289 (1982-10-01), Beyer et al.
patent: 4471330 (1984-09-01), Naster et al.
patent: 4638190 (1987-01-01), Hwang et al.
patent: 5081432 (1992-01-01), Devlin et al.
patent: 5166648 (1992-11-01), Wen et al.
Dydyk Michael
Lindberg Craig E.
Grimm Siegfried H.
Motorola Inc.
Nehr Jeffrey D.
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