Modulator for radio-frequency signals

Details Modulator for radio-frequency signals Modulator for radio-frequency signals

2008-10-15

2010-06-01

Chang, Joseph (Department: 2817)

Modulators

Amplitude modulator

Single or vestigial sideband type

C375S308000, C332S103000, C332S104000

Reexamination Certificate

active

07728691

ABSTRACT:
A modulator for radio-frequency signals designed an entirely digital modulator has two mixer stages connected in series. The first mixer stage implements with a relatively low first sample rate a frequency mixing with a first oscillator frequency that is adjustable with high precision. The second mixer stage implements a frequency mixing with a significantly higher second sample rate and with a relatively coarsely adjustable second oscillator frequency. The downstream second mixer stage, in the case of a single mixer stage, the mixer stage, has at least two phase accumulators that are incremented with the higher second sample rate but with different incremental values. The output signal of at maximum one of the phase accumulators is evaluated at any point in time.

REFERENCES:
patent: 6621366 (2003-09-01), Gentile
patent: 2003/0174784 (2003-09-01), Samarasooriya et al.
patent: 2005/0003785 (2005-01-01), Jackson et al.
patent: 2006/0097814 (2006-05-01), Schlesinger et al.
patent: 198 28 955 (1999-12-01), None

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