Yuchun Chang

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Novel GaAs-AlGaAs heterojunction phototransistors with a /spl delta/-doped base have been fabricated. Very high gain and low output noise have been measured. The measured noise is composed of shot noise associated with collector quiescent bias current and amplified shot noise due to collector leak current for nonpassivated devices. The high gain and low(More)
A simple lateral structure phototransistor, combined with a normal phototransistor and a punchthrough transistor, has been successfully designed and fabricated in standard commercial CSMC 0.5- mum CMOS process. The proposed punchthrough enhancement mechanism provides a high optical gain of close to 10<sup>7</sup> for a low-level optical power of 7.0(More)
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