Global Patent Index - EP 0169388 B1

EP 0169388 B1 19880928 - INTEGRATED CONSTANT-CURRENT SOURCE

Title (en)

INTEGRATED CONSTANT-CURRENT SOURCE

Publication

EP 0169388 B1 19880928 (DE)

Application

EP 85107776 A 19850624

Priority

DE 3426166 A 19840716

Abstract (en)

[origin: US4651083A] An integrated constant-current source having an operational amplifier with an inverting input to which a reference voltage is feedable, and an output; a first stage to which the output is coupled and by which the output voltage of the operational amplifier is converted to a first current, the first stage being in a circuit wherein a reference resistor is connected from which, for coupling a voltage dropping across the reference resistor, the reference resistor is coupled to a non-inverting input of the operational amplifier; and a second stage coupled to the output of the operational amplifier for converting the output voltage of the operational amplifier to a second current, the second stage being in a circuit wherein a current reflector is connected for supplying an output current which is constant in a first approximation, the integrated constant current source includes a third stage coupled to the output of the operational amplifier and converting the output voltage thereof into another current, the third stage being in a circuit wherein another current reflector is connected, and another stage coupled to the reference resistor, the other current reflector conducting reflected current and having a stage thereof connected in a circuit wherein the other stage coupled to the reference resistor is also connected.

IPC 1-7

G05F 1/56

IPC 8 full level

G05F 1/56 (2006.01)

CPC (source: EP)

G05F 1/561 (2013.01)

Designated contracting state (EPC)

AT CH DE FR GB IT LI NL

DOCDB simple family (publication)

EP 0169388 A1 19860129; EP 0169388 B1 19880928; AT 37619 T 19881015; DE 3565328 D1 19881103; JP S6136816 A 19860221; KR 860001374 A 19860226; US 4651083 A 19870317

DOCDB simple family (application)

EP 85107776 A 19850624; AT 85107776 T 19850624; DE 3565328 T 19850624; JP 15586685 A 19850715; KR 850004763 A 19850703; US 75486385 A 19850712