Input data processor for D/A converter utilizing dithering

Details Input data processor for D/A converter utilizing dithering Input data processor for D/A converter utilizing dithering

1990-03-12

1991-04-30

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341144, H03M 100

Patent

active

050122428

ABSTRACT:
An input data processor of the present invention has a dither signal adder for adding a dither signal to digital data which corresponds to an alternating signal of the type which crosses the zero level each time the alternating signal varies from a maximum to a minimum (i.e., positive max to negative max). The resultant signal of the digital signal added to the dither signal is sent to a level shift circuit which shifts the digital data output from the adder to a positive or negative level, which has sufficient magnitude to prevent the signal from crossing the zero level during variation from max to min. By eliminating zero crossing with this shifting operation, the present invention prevents inversion of the MSB of the digital signal, which also prevents glitches in the analog output. These glitches were previously caused by inversion of the MSB.

REFERENCES:
patent: 4857927 (1989-08-01), Takabayashi
patent: 4937576 (1990-06-01), Yoshio et al.

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