PNP PIN bipolar phototransistors for high-speed applications built in a 180 nm CMOS process
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This work reports on three speed optimized pnp bipolar phototransistors build in a standard 180 nm CMOS process using a special starting wafer. The starting wafer consists of a low doped p epitaxial layer on top of the p substrate. This low doped p epitaxial l... ...