Spectral shaping of circuit errors in digital-to-analog converte

Details Spectral shaping of circuit errors in digital-to-analog converte Spectral shaping of circuit errors in digital-to-analog converte

1996-03-06

1997-11-04

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341148, H03M 166

Patent

active

056844824

ABSTRACT:
A general digital-to-analog (DAC) topology spectrally shapes the DAC conversion noise caused by analog circuit mismatches. In particular, highly practical first-order and second-order noise-shaping DACs are special cases of a general topology. The topology extends the practicality of using noise-shaping DACs in .DELTA..SIGMA. data converters. The first-order DAC is at least as hardware efficient as previously known DACs, but offers the advantage that it is amenable to a simple dithering technique capable of eliminating spurious tones. The second-order DAC is more hardware efficient than previously known DACs, and generally has a large spurious-free dynamic range without any dithering. Moreover, the present invention allows DACs with other types of noise-shaping characteristics (e.g., bandpass noise-shaping characteristics) to be designed based on general DAC topology.

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