Patent ID: 8755904

Claim:
An electronic circuit arrangement for generating at least two different constant currents at a load resistor R, comprising: a bridge circuit having at least first, second, third and fourth legs ( 3 , 4 , 5 , 6 ), and switching elements S 1 and S 2 and a bridge branch ( 7 ) between the legs, in which the load resistor R is inserted, and at least first and second current current sources (IS 1 , IS 2 ) connected to the legs of the bridge circuit in such a manner that the current sources provide for a current via one of the legs through the bridge branch ( 7 ) through one of the legs, connected to an other end of the bridge branch ( 7 ) in the case of a corresponding switch position, the first current source (IS 2 ) in each case provides for a first current I 1 (i 2 ′) via the first leg (( 3 ) or ( 4 )), which is connected to one end of the bridge branch ( 7 ), through the bridge branch ( 7 ) and through the second leg (( 4 ) or ( 3 )), connected to the other end of the bridge branch ( 7 ) opposite to the first leg (( 3 ) or ( 4 )), when a first one of the switching elements (S 1 ) in the first leg (( 3 ) or ( 4 )) and an optional second switching element, which can be provided separately or integrated in the first current source (IS 2 ), in the second leg (( 4 ) or ( 3 )) is correspondingly switched on, the second current source (IS 1 ) case provides for another current I 2 (i 1 ′) via the third leg (( 5 ) or ( 6 )), which is connected to the end of the bridge branch ( 7 ) which is opposite to the end of the bridge branch ( 7 ) to which the first leg (( 3 ) or ( 4 )) is connected, through the bridge branch ( 7 ) and through the fourth leg (( 6 ) or ( 5 )), connected to the other end of the bridge branch ( 7 ), when a third one of the switching elements (S 2 ) in the third leg (( 5 ) or ( 6 )) and an optional fourth switching element, which is provided separately or integrated in the second current source (IS 1 ) in the fourth leg (( 6 ) or ( 5 )) is correspondingly switched on, when in each case the load resistor R renders the bridge branch ( 7 ) to have continuity.