Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1988-02-03
1990-11-13
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341155, 341158, H03M 136
Patent
active
049705130
ABSTRACT:
A device for converting an analog signal into a corresponding N-bit digital signal (A/D converter) of a parallel comparison type is disclosed having a 2.sup.N-M number of M-bit encoders, a single N-bit encoder, and error suppression circuits, a block indicating signal on a block indicating line belonging to each M-bit encoder serving as an output inhibit signal for one of the other error suppression circuits connected to the M-bit encoder in one lower order for higher order) with respect to the corresponding M-bit encoder, and the block indicating line of each M-bit encoder being connected to an output terminals of one of the comparators in a lowest order (or highest order) or a few comparators in the comparator group to which the corresponding M-bit encoder is connected. Therefore, if an output signal is generated from the highest comparator for lowest comparator) in the comparator group whose output terminals are connected to the corresponding M-bit encoder, the transmission of the output signal of the M-bit encoder in one lower order (or higher order) to the N-bit encoder is interrupted by means of the corresponding error suppression circuits when the output signal from the one lower order (or higher order) is generated. The block indicating signal is directly used as the output inhibit signal for the one lower order error suppression signal so that no particular gate circuit is needed, thus reducing the number of transistors. In addition, the small number of comparators are connected to the block indicating line so that the number of transistors is accordingly reduced.
REFERENCES:
patent: 3877025 (1975-04-01), Maio
patent: 4122439 (1978-10-01), Ninomiya
patent: 4417233 (1983-11-01), Inoue et al.
patent: 4639715 (1987-01-01), Doluca
patent: 4641129 (1987-02-01), Doluca et al.
Shoop Jr. William M.
Young Brian K.
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