Sigma delta type digital/analog converter system

Details Sigma delta type digital/analog converter system Sigma delta type digital/analog converter system

1992-03-27

1993-07-06

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341131, H03M 300

Patent

active

052258351

ABSTRACT:
An identical digital signal and a total of k different DC offset signals are provided to the respective ones of a total of k adders. Each of the adders outputs a signal representing the sum of the digital signal and the DC offset signal. The adders are connected to the respective .SIGMA..DELTA. type D/A converters and the output signals of the k type D/A converters are summed up to form a single output signal. Any two of the levels of the DC offset signals given to the k adders differ from each other by equal to or greater than 0.2% of the full scale value of the .SIGMA..DELTA. type D/A converters. With such an arrangement, the performance of the .SIGMA..DELTA. type D/A converters can be remarkably improved without raising the sampling rate and the number of orders of the type D/A converters.

REFERENCES:
patent: 5061925 (1991-10-01), Sooch et al.
patent: 5073777 (1991-12-01), Fukuhara et al.

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