Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1990-06-25
1991-01-29
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341158, 341118, H03M 138, H03M 106
Patent
active
049890042
ABSTRACT:
For preventing an analog-to-digital converting unit for a successive approximation from error in operation, the analog-to-digital converting unit has not only a first comparator circuit but also second and third comparator circuits for comparing an analog input signal with first and second critical signals indicative of a responsible voltage range, and the second or third comparator circuit produces a first or second warning signal in the presence of the analog input signal output the responsible voltage range, then a sequential approximation controlling circuit restricts a bit signal of an digital output signal thereof which allows a digital-to-analog converting circuit to produce a comparison voltage signal within a predetermined range, thereby preventing the first comparator circuit from a error in operation.
REFERENCES:
patent: 3846787 (1974-11-01), Myers et al.
patent: 4194185 (1980-03-01), Wilson
patent: 4407020 (1983-09-01), Helliwell et al.
patent: 4498072 (1985-02-01), Moriyama
patent: 4740776 (1988-04-01), Sloane
patent: 4771266 (1988-09-01), Nunokawa
Logan Sharon D.
NEC Corporation
Shoop Jr. William M.
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