Modulators – Frequency shift keying modulator or minimum shift keying... – Including logic element
Patent
1995-10-13
1997-05-06
Mis, David
Modulators
Frequency shift keying modulator or minimum shift keying...
Including logic element
375274, 375305, H03C 300, H04L 2712
Patent
active
056274998
ABSTRACT:
A method and apparatus for digitally phase modulating and frequency upconverting communication signals to an intermediate frequency, producing the IF output with only digital hardware and without the use of digital to analog converters, analog multipliers (mixers) or power combiners. A digital phase modulator provides an in-phase and a quadrature output, each of which is coupled to one input of a relatively simple multi-bit to single-bit delta-sigma data converter. The output from the converter is a pair of single-bit digital output signals. Each such single-bit output is inverted and both the inverted single-bit output and the non-inverted single-bit output of both the in-phase and the quadrature outputs are coupled to a 4:1 multiplexer. One of these four inputs is then selected by a modulo-4 counter. The modulo-4 counter is incremented at a rate that is selected based upon the desired IF frequency.
REFERENCES:
patent: 5155454 (1992-10-01), Amoroso
patent: 5434888 (1995-07-01), Fukuchi
"Oversampling methods for A/D and D/A Conversion", James C. Candy and Gabor C. Temes, IEEE 1992, pp. 1-19, 1992 no month.
Jaquez Martin J.
Mis David
Pacific Communication Sciences, Inc.
Richman, III Merle W.
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