Analog-digital conversion circuit device and analog-digital conv

Details Analog-digital conversion circuit device and analog-digital conv Analog-digital conversion circuit device and analog-digital conv

1993-09-01

1995-03-21

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 114

Patent

active

054000297

ABSTRACT:
A compact and fast analog-digital conversion circuit device is described.
A coarse analog digital conversion is carried out by a first voltage-dividing circuit 4 and a first voltage comparing circuit block 5. Thereafter, a particular voltage level specified by the coarse conversion is subtracted from an input analog signal Vin held in a sample and hold circuit 2. A result thereof is processed by a second voltage comparing circuit block 10 to effect a fine analog-digital conversion. By such a construction, a number of analog switches contained in a multiplex circuit block 6 can be reduced significantly. Further, compensative reference voltage levels are formed from a second voltage-dividing circuit 9 by an addition/subtraction circuit 11, and a third voltage comparing circuit block 12 is utilized to compare with an output of a subtraction circuit 7 to thereby compensate for error induced between the coarse and fine conversion.

REFERENCES:
patent: 4893124 (1990-01-01), Tsuji et al.
patent: 4918449 (1990-04-01), Chin
patent: 5184130 (1993-02-01), Mangelsdorf
patent: 5210537 (1993-05-01), Mangelsdorf
patent: 5264851 (1993-11-01), Yasuda
patent: 5345237 (1994-09-01), Kouno et al.

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