Direct digital amplitude modulator

Details Direct digital amplitude modulator Direct digital amplitude modulator

2007-01-16

2007-01-16

Mis, David (Department: 2817)

Modulators

Amplitude modulator

C332S103000, C375S298000

Reexamination Certificate

active

10426557

ABSTRACT:
Various embodiments of a direct digital amplitude modulator (DDAM) for modulating radio frequency (RF) or intermediate frequency (IF) or baseband signal with the invented interpolation technique are disclosed. The interpolation technique greatly reduces the amplitudes of alias signals without using an analog filter. The embodiments therefore are significant for various communication transmitters to achieve simple structure, good linearity and high power efficiency.

REFERENCES:
patent: 2005/0074073 (2005-04-01), Yuan et al.
patent: 2 118 384 (1983-10-01), None
patent: WO 99/11040 (1999-03-01), None
patent: WO 99/52206 (1999-10-01), None

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