Digital-to-analog conversion of LSB-first type using selective i

Details Digital-to-analog conversion of LSB-first type using selective i Digital-to-analog conversion of LSB-first type using selective i

1997-12-15

2000-06-20

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341153, H03M 172, H03M 180

Patent

active

060782765

ABSTRACT:
D/A-conversion of a Gray coded digital input signal is performed according to an inventive recursive Gray code-to-analog conversion algorithm. According to the recursive algorithm, the Gray code bits of the digital input are successively applied in the recursions of the algorithm, one Gray code bit for each recursion, and the analog output signal is generated by recursively updating an intermediate signal. In each recursion, the intermediate signal is selectively inverted in dependence on the particular Gray code bit that is applied in the recursion. The selective inversion of the intermediate signal is an inherent property of the Gray code-to-analog algorithm, and it is a key factor to reduce the accumulation of errors in a D/A-conversion. In a D/A-converter architecture based on the algorithm, the accumulation of offset errors will be low. Furthermore, the fact that the signal inversion is digitally controlled enables high precision implementations, further improving the performance of the D/A-converter.

REFERENCES:
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patent: 4591826 (1986-05-01), Seiler
patent: 4596979 (1986-06-01), Sisson
patent: 5180932 (1993-01-01), Bengel
patent: 5424740 (1995-06-01), Chang et al.
patent: 5519396 (1996-05-01), Distinti
patent: 5798747 (1998-08-01), Moraveji
patent: 5847667 (1998-12-01), Baek

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