Parallel-serial analog to digital converters

Details Parallel-serial analog to digital converters Parallel-serial analog to digital converters

1976-04-29

1978-12-26

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347M, H03K 13175

Patent

active

041318854

ABSTRACT:
In an analog to digital converter in which each sampled portion of an incoming video or other analog signal is converted to a digital character in a plurality of parallel conversions occurring serially; the range of the voltage level reference signals of descending magnitude which are applied to comparators for effecting a relatively fine parallel conversion of a sampled analog signal is selected to be larger than, and offset in respect, to the steps or increments of the voltage level reference signals of descending magnitude which are applied to comparators for effecting a preceding relatively coarser parallel conversion, and the encoded outputs from the serially occurring parallel conversions are digitally added with the least significant bit of the encoded output from each preceding relatively coarser parallel conversion being accorded the same weight as the most significant bit of the encoded output from the next following relatively finer parallel conversion so as to eliminate from the result of the digital addition defects that would otherwise arise from inaccuracies in the voltage level reference signals and/or in the comparing operations of the comparators.

REFERENCES:
patent: 3298014 (1967-01-01), Stephenson
patent: 3311910 (1967-03-01), Doyle
patent: 3541315 (1970-11-01), Naydan et al.
patent: 3597761 (1971-08-01), Fraschilla et al.
patent: 3860952 (1975-01-01), Tallent et al.
patent: 3967269 (1976-06-01), Fletcher
Fletcher, A Video Analogue to Digital Converter, Oct. 1974, Report of the International Broadcasting Convention, pp. 47-57.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, p. II-41.

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