Question

4. The driver stage of a power amplifier is often a PNP-NPN Class-AB pair. It is important for the two transistors in the pair to have identical values of Bic Both transistors have base width W= 1.0 μm . The PNP device has N,-1016cm-3, For Si, the diffusion constants and lengths are: D./D, 3.3333; L/L,-1.8257; L-0.3116 cm; L, 0.1707 cm. For the NPN device BiIf NE 10'" cm 3 for the NPN device find the required N HINTS: The expression for Ba from class is valid for both types of devices, however you must remember that doping types (acceptor, NB 5x101" cm find the ratio Na/N so that the two transistors have identical cm for donor) and diffusion data D, Dp; I L, are opposite!

Answer 1

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