Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1990-02-27
1991-01-22
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341155, H03M 136
Patent
active
049874179
ABSTRACT:
To provide for a higher speed operation, lower cost and less complexity in terms of manufacturing, the present invention analog-to-digital converter has feedforwards, from the more significant comparators, to the less significant comparators. As the respective outputs of the comparators change state, the voltage representing that state, for that comparator, is fed to succeeding less significant comparators. With the exception of the most significant comparator whose reference bias voltage remains static, the respective bias voltages of the rest of the successive less significant comparators are shifted, either higher or lower, as the output states of their predecessor comparator(s) change. Consequently, the respective outputs of the comparators correspond, in a binary progressive manner, to a digital word that is representative of the voltage of an input analog signal.
REFERENCES:
patent: 4533903 (1985-08-01), Yamada et al.
patent: 4559522 (1985-12-01), Sekino et al.
"Linear Electronic Analog/Digital Conversion Architectures, Their Origins, Parameters, Limitations, and Applications", By Bernard M. Gordon, IEEE Transactions on Circuits and Systems, vol. CAS-25, No., Jul. 1978.
Grumman Aerospace Corporation
Kim Helen
Shoop Jr. William M.
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