The Lambda Bipolar Phototransistor - Analysis and Applications

Ching Yuan Wu, Hong Dah Sheng, Yao Tsong Tsai

Research output: Contribution to journalArticlepeer-review

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Abstract

An analytic model for the I— V characteristic of the lambda bipolar phototransistor (LBPT) is developed in which the characteristic parameters, such as the peak voltage, peak current, differential negative resistance, valley voltage, and valley current, are expressed in terms of the known device parameters and photocurrent. It is shown that the valley current of the new device in the dark is much smaller than the saturation dark current of the conventional bipolar phototransistor and the differential negative resistance region can be varied for wide range by controlling the fabrication processes. Comparisons between the characteristics of the fabricated devices and the developed model have been made and satisfactory agreement has been obtained. Moreover, some interesting applications of this new device in photodetection are also presented and discussed. In addition, the frequency limit of the LBPT and the improvement methods are also discussed.

Original languageEnglish
Pages (from-to)1227-1234
Number of pages8
JournalIEEE Journal of Solid-State Circuits
Volume20
Issue number6
DOIs
StatePublished - Dec 1985

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