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Current Mirror and Image Tolerance Compensation

IP.com Disclosure Number: IPCOM000054839D
Original Publication Date: 1980-Apr-01
Included in the Prior Art Database: 2005-Feb-13

Publishing Venue

IBM

Related People

Authors:
Heimeier, H Klein, W Najmann, K Wernicke, F [+details]

Abstract

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.