Pulse or digital communications – Transmitters – Angle modulation
Patent
1997-07-15
2000-09-19
Tse, Young T.
Pulse or digital communications
Transmitters
Angle modulation
375300, 332127, 332144, 455108, H04L 2720
Patent
active
061223263
ABSTRACT:
An apparatus for generating a modulated signal which includes a modulator operative for receiving a first signal and input data signals, and modulating the first signal in accordance with the input data signals so as to produce a modulated reference signal; a first frequency divider coupled to the modulator output, operative to reduce the frequency of the modulated reference signal by a predetermined factor; a signal generator operative to produce a second signal; a first mixer having a first input coupled to an output of the first frequency divider and a second input coupled to the output of the signal generator. The first mixer operates to frequency translate the modulated reference signal by an amount equal to the frequency of the second signal. In addition, the signal generator of the present invention contains a direct digital synthesizer coupled to a second phase lock loop which operates to up-convert the output signal of the DDS to the microwave region. The feedback network of the second phase lock loop utilizes frequency translation to down-convert the output signal in order to close the loop.
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Bourner David
Jackson Thomas
Tang Hai
Hughes Electronics Corporation
Sales Michael W.
Tse Young T.
Whelan John T.
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