Modulators – Frequency shift keying modulator or minimum shift keying...
Patent
1996-12-20
1998-11-10
Grimm, Siegfried H.
Modulators
Frequency shift keying modulator or minimum shift keying...
332103, 332144, 375274, 375279, 375305, 375308, H03C 309, H04L 2720
Patent
active
058349855
ABSTRACT:
A system and method are provided in which a phase modulation generator is used to modulate the output signal of a DDS with a modulation index, h/N. The phase-modulated. DDS output drives a PLL, which is an upconversion stage for a radio transmitter, with the modulated DDS signal as the PLL's reference. The output of the PLL will have a modulation index of h. Consequently, the frequency band of the DDS output is significantly narrower than the frequency band of upconversion stages used in conventional transmitters, and there are significantly less spurious emissions in the transmitted signal. However, a transmitter employing the present phase-modulated DDS-driven PLL topology can still transmit over a relatively wide frequency band.
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Novel Measurement Schemes Serve I/Q Applications by Radhakrishnaiah P.N. Setty Mini-Circuits, P.O. Box 350166, Brooklyn, New York 11235-0003.
Grimm Siegfried H.
Telefonaktiebolaget L M Ericsson (publ)
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