What is the role of resistor R3 in getting the low bias current we are obtaining out of the Widlar source? I don't really know the importance of R3 when looking at the figure. Is it because it controls the amount of current flowing through the transistor?

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Digital Integrated Circuit Design

Digital IC design is a procedural interaction that involves converting determinations and highlights into computerized blocks, which are then further transformed into basic circuits. A significant number of the imperatives related with advanced IC plan come from the foundry cycle and innovative restrictions.