Oversampled digital-to-analog converter for multilevel data tran

Details Oversampled digital-to-analog converter for multilevel data tran Oversampled digital-to-analog converter for multilevel data tran

1991-11-07

1993-03-30

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341147, H03M 166

Patent

active

051988186

ABSTRACT:
A digital-to-analog converter (DAC) is disclosed which uses an oversampled modulation technique followed by an analog lowpass filter to generate an output waveform with four precisely controlled amplitude levels for 2B1Q data transmission applications. The DAC accepts a 2-bit input word at the baud rate and generates one of four possible analog output amplitudes having relative ratios of +3, +1, -1, and -3.

REFERENCES:
patent: 3506848 (1970-04-01), Beurrier
patent: 3632996 (1972-01-01), Paine
patent: 3838414 (1974-09-01), Wiles
patent: 4233591 (1980-11-01), Murata et al.
patent: 4532496 (1985-07-01), Ichinose
patent: 4584690 (1986-04-01), Cafiero et al.
patent: 4953160 (1990-08-01), Gupta
patent: 5014054 (1991-05-01), Oshita et al.

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