Method and control system for generating a variable output bit a

Details Method and control system for generating a variable output bit a Method and control system for generating a variable output bit a

1988-02-18

1989-04-18

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, 341162, 377 70, H03M 120

Patent

active

048231304

ABSTRACT:
In a digital control system wherein control voltages are analog voltages, a method and control system for generating a variable output bit resolution from an N bit analog to digital converter utilizing a control circuit to control the input spread of the voltage references to the A/D converter. Depending on the binary value of the MSD position, the input reference voltage spread is controlled. If the binary value is zero, the input reference voltage spread is one-half the normal value and the resolution is N+1 bits and if the binary value is zero for both the MSD and MSD-1 positions, the input reference voltage spread is one-fourth the normal value and the resolution is N+2 bits and so on until the first binary one value is found after consecutive preceding binary zero values.

REFERENCES:
patent: 4355293 (1982-10-01), Driscoll
patent: 4431985 (1984-02-01), Mott
patent: 4733216 (1988-03-01), Wright
The Engineering Staff of Digital Equipment Corporation, Analog-Digital Conversion Handbook, 1964, pp. 20-22.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-34 and I-35.

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