Pulse or digital communications – Transmitters – Angle modulation
Patent
1998-04-29
2000-08-08
Chin, Stephen
Pulse or digital communications
Transmitters
Angle modulation
375260, 375261, 375296, H04L 2700
Patent
active
061012254
ABSTRACT:
A method and apparatus for producing phase reference signals for use in a quadrature modulation circuit are disclosed. The quadrature modulation circuit includes a signal splitter (130), a first and second signal conditioning circuit (104, 106), a local oscillator (126) and a combiner (128). The method includes generating a first and second phase reference signal (111, 113) by the local oscillator. The method also includes providing a first and second sign information signal (225, 223) to a corresponding first and second phase modulator (240, 242). Finally, the method includes modulating the first phase reference signal (111) by the first phase modulator (240) to produce a first modulated phase reference signal (131), and modulating the second phase reference signal (113) by the second phase modulator (242) to produce a second phase modulated reference signal (133). The phase modulated reference signals (131, 133) are then amplitude modulated and combined for subsequent transmission.
REFERENCES:
patent: 5373532 (1994-12-01), Fujita et al.
patent: 5715280 (1998-02-01), Sandberg et al.
patent: 5844943 (1998-12-01), Kazecki et al.
patent: 5847619 (1998-12-01), Kirisawa
Chin Stephen
Haas Kenneth A.
Liu Shuwang
Motorola Inc.
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