Analog transducer circuit with digital control

Details Analog transducer circuit with digital control Analog transducer circuit with digital control

1987-12-24

1988-11-08

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With particular transmitter

34087004, 34087005, 34087017, 34087021, 364557, 364573, G08C 1910, G08C 1912

Patent

active

047836598

ABSTRACT:
A two wire transmitter controls loop current as a function of a sensed parameter such as pressure or temperature using analog sensing and signal processing circuitry. Corrections, such as for zero, span, and linearity are provided in the form of analog correction signals by a digital circuit which includes nonvolatile memory, a microcomputer, and a digital-to-analog (D/A) converter. The microprocessor controls the D/A converter as a function of stored digital correction values to produce the analog correction signals used by the analog signal processing circuitry to control the magnitude of the loop current flowing through the two wire transmitter.

REFERENCES:
patent: 3646538 (1972-02-01), Frick
patent: 4001813 (1977-01-01), Kowswkowski
patent: 4129863 (1978-12-01), Gray et al.
patent: 4145619 (1979-03-01), Tseng
patent: 4494183 (1985-01-01), Bayer et al.
patent: 4519253 (1985-05-01), Frick
patent: 4567466 (1986-01-01), Bozarth et al.
patent: 4570490 (1986-02-01), Antonazzi
patent: 4604566 (1986-08-01), Sterling, Jr. et al.

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