Patent ID: 7995047

Claim:
A current driving device, comprising: a first voltage supply source for supplying a first voltage; a first current supply source for supplying a first electric current; a plurality of output terminals; and a plurality of current output circuits for outputting an electric current in accordance with said first electric current, each of said current output circuits comprising a current-voltage converting circuit, a voltage-current converting circuit, a voltage holding circuit having a terminal being connected to a reference voltage different from the first voltage, and at least one current output terminal, wherein: each of said current output circuits operates in three operation modes including a voltage supply mode, a current supply mode, and a current output mode, under said voltage supply mode, each of said current output circuits receives said first voltage from said first voltage supply source, and the first voltage is supplied to another terminal of said voltage holding circuit, under said current supply mode, each of said current output circuits receives said first current from said first current supply source, and generates a second voltage by said current-voltage converting circuit, and the first current is supplied to said another terminal of said voltage holding circuit, and under said current output mode, each of said current output circuits outputs an output current according to said voltage held in said voltage holding circuit by said voltage-current converting circuit.