EP 0328520 B1 19990623 - ANALOG TRANSDUCER CIRCUIT WITH DIGITAL CONTROL
Title (en)
ANALOG TRANSDUCER CIRCUIT WITH DIGITAL CONTROL
Title (de)
ANALOGER MESSUMFORMER MIT DIGITALER STEUERUNG
Title (fr)
CIRCUIT TRANSDUCTEUR ANALOGIQUE A COMMANDE NUMERIQUE
Publication
Application
Priority
- US 89937886 A 19860822
- US 8701942 W 19870812
Abstract (en)
[origin: WO8801417A1] A two wire transmitter (10) 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 a nonvolatile memory (36), a microcomputer (32), and a digitial-to-analog (D/A) converter (26). The microprocessor (32) controls the D/A converter (26) 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 (10).
IPC 1-7
IPC 8 full level
G08C 19/02 (2006.01)
CPC (source: EP)
G08C 19/02 (2013.01)
Citation (examination)
Designated contracting state (EPC)
AT DE FR GB IT SE
DOCDB simple family (publication)
WO 8801417 A1 19880225; AT E181611 T1 19990715; CA 1300924 C 19920519; DE 3752283 D1 19990729; EP 0328520 A1 19890823; EP 0328520 A4 19891004; EP 0328520 B1 19990623
DOCDB simple family (application)
US 8701942 W 19870812; AT 87905408 T 19870812; CA 545002 A 19870820; DE 3752283 T 19870812; EP 87905408 A 19870812