Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer
Patent
1997-01-27
1999-03-16
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synthesizer
327107, 711221, H03B 2100
Patent
active
058835300
ABSTRACT:
The present invention relates to methods and devices for generating cycled waveforms of nonsingle period, and more particularly to an improvement from the one-way counter used by conventional cycled waveform generator of nonsingle period into an up-down counter or a programmable up-down counter, along with an adder/subtracter. Thus, only the varied values in waveform relative to a DC level have to be filled into a table, and then the varied values in waveform (i.e. the digital waveform sampling values) are input into said adder/subtracter to obtain a periodic digital values by adding/subtracting with a predetermined DC level. Finally, cycled waveforms of nonsingle period are obtained by digital-to-analog converting of said digital values. With the methods and devices of the present invention, not only the fillings in said table can be decreased to reduce the cost, but also the DC output level can be fixed or adjusted arbitrarily for convenient signal processing.
REFERENCES:
patent: 4192007 (1980-03-01), Becker
patent: 4404644 (1983-09-01), Howie
patent: 4492936 (1985-01-01), Albarello et al.
patent: 5121348 (1992-06-01), Dea et al.
patent: 5703540 (1997-12-01), Gazda et al.
Callahan Timothy P.
Holtek Microelectronics Inc.
Kim Jung Ho
LandOfFree
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