MSK modulator having a digital quadrature reference waveform gen

Details MSK modulator having a digital quadrature reference waveform gen MSK modulator having a digital quadrature reference waveform gen

1992-04-22

1993-06-01

Grimm, Siegfried H.

Modulators

Frequency shift keying modulator or minimum shift keying...

Including logic element

375 47, 375 64, H04L 2720

Patent

active

052163911

ABSTRACT:
An MSK modulator providing a high precision digital phase adjustment with a simple circuit structure. A sample data of a sine wave or cosine wave is read from a memory at an address calculated from an initial address value. The initial address value is set in accordance with the amount of phase to be adjusted. A predetermined number of sample data read from the memory is held, outputted in a predetermined order, and converted into an analog signal. The phase of the converted analog signal is adjusted, and thereafter multiplied by an input baseband signal. The multiplied result is outputted as a modulation signal.

REFERENCES:
patent: 4897620 (1990-01-01), Paradise
patent: 5022054 (1991-06-01), Wang

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