Current Mirror and Image Tolerance Compensation
Original Publication Date: 1980-Apr-01
Included in the Prior Art Database: 2005-Feb-13
To generate low but accurate currents in bipolar circuits, current mirrors are used. The current mirror of Fig. 1 consists of one current sink formed by transistor T1 and several further sinks formed by corresponding transistors T2. The necessary base current is applied to T1 and T2 via a reference circuit connected to the supply voltage V(O) and consisting of series-connected resistor R3 and transistor T3 acting as a diode. R3 must be highly resistive.