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Semiconductors: Adding More Junctions

The transistors we studied earlier have no more than two junctions, to form NPN or PNP bipolar transistors. What happens if we build devices with more junctions? What might a PNPN device be able to do? How about a 5-layer device, either PNPNP or NPNPN? Could we make any practical use of such a device?

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