Digital phase modulator and corresponding method

Details Digital phase modulator and corresponding method Digital phase modulator and corresponding method

2008-04-16

2010-06-15

Mis, David (Department: 2817)

Modulators

Phase shift keying modulator or quadrature amplitude modulator

C332S104000, C375S308000

Reexamination Certificate

active

07737799

ABSTRACT:
A simple, interference-free digital phase modulator is to be provided. To this end, the phase modulator is provided with a counter for outputting a counter signal on the basis of a predetermined clock signal and a comparator, which receives a current counter state from the counter, in order to record a digital input signal. The comparator compares the input signal with the current counter state on the basis of a predetermined allocation table and resets the counter, if the input signal corresponds to a counter state assigned via the allocation table. A predetermined signal value of the output counter signal is herewith phase-modulated as a function of the input signal. As only one phase position is generated with the circuit at any point in time, interferences, which are produced by the digital phase modulator itself, are significantly less.

REFERENCES:
patent: 3781706 (1973-12-01), Osborne et al.
patent: 4206423 (1980-06-01), Nossen
patent: 4562415 (1985-12-01), McBiles
patent: 4794621 (1988-12-01), Dirr
patent: 6791596 (2004-09-01), Nihei et al.
patent: 0 551 573 (1993-07-01), None

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