| 摘要 |
<p>A device for generating a bias current, comprising: a reference voltage source (2) for supplying a reference voltage between a first reference terminal (4) and a second reference terminal (6); a bias current generator (8) for generating the bias current in response to the reference voltage, comprising: a first (10) and a second (12) input terminal coupled to the first (4) and the second (6) reference terminal (6) via connecting wires for receiving the reference voltage; a first (16) and a second (18) transistor arranged as a differential pair, the gate of the first transistor (16) being coupled to the first input terminal (10) and the gate of the second transistor (18) being coupled to the second input terminal (12), the source of the first transistor (16) and the source of the second transistor (18) being coupled to one another in a common terminal (20) for receiving a common current, each of said transistors having a drain for supplying a first transistor current and a second transistor current, respectively, whose difference decreases when the common current increases; a converter (22) coupled to the first (16) and the second (18) transistor and having an output terminal (24) for supplying a current which is proportional to the difference between the first transistor current and the second transistor current; a first current mirror (32) having an input branch (34) coupled to the output terminal (24) of the converter (22); a second current mirror (40) having an input branch (42) coupled to an output branch (36) of the first current mirror (32), and an output branch (46) coupled to the common terminal (20). The connecting wires (14) are not current-carrying and interference as a result of cross-talk from other circuits to the connecting wires is suppressed by the differential pair (16, 18). <IMAGE></p> |
