Method and apparatus for an oversampled digital to analog conver

Details Method and apparatus for an oversampled digital to analog conver Method and apparatus for an oversampled digital to analog conver

1995-08-15

1997-01-07

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341144, 341145, 341120, H03M 302

Patent

active

055921655

ABSTRACT:
A method and apparatus for an oversampled single bit digital to analog convertor (DAC) is accomplished by using an FIR filter as the analog reconstruction filter, wherein the FIR filter includes primary current sourcing circuitry and secondary current sourcing circuitry. The primary current sourcing circuitry is used to produce a portion of the FIR coefficients having relatively large values, while the secondary current sourcing circuitry is used to fine tune the FIR coefficients having the relatively large values and to produce the other FIR coefficients. Combining the results of the primary current sourcing circuitry and the secondary current sourcing circuitry produces an analog signal.

REFERENCES:
patent: 3543009 (1970-11-01), Voelcker, Jr.
patent: 4967140 (1990-10-01), Groeneveld et al.
patent: 5323157 (1994-06-01), Ledzius et al.
patent: 5331583 (1994-07-01), Hara et al.
patent: 5442354 (1995-08-01), Cabler
"A CMOS Oversampling D/A Converter with a Current-Mode Semidigital Reconstruction Filter," Su, et al., IEEE Journal of Solid-State Circuits, vol. 28, No. 12, Dec. 1993, pp. 1224-1233.

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