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Design of bipolar imaging device (BASIS)

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5 Author(s)
Y. Nakamura ; Canon Inc., Kanagawa, Japan ; H. Ohzu ; M. Miyawaki ; N. Tanaka
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The design methodology of a bipolar imaging device, BASIS (base-stored image sensor), with a capacitor-loaded emitter-follower circuitry, is established by analyzing the basic operation of BASIS and the generation mechanism of fixed pattern noise where theoretical results coincide well with experimental results. From this methodology, a wide dynamic range of linearity is assured by optimizing the forward-bias voltage in readout operation, while high sensitivity is realized by making the base-to-collector junction capacitance C bc as small as possible and by designing the emitter common current gain hFE of a phototransistor in a pixel to be as high as possible. In order to reduce fixed pattern noise, nonuniformities of hFE and Cbc should be made as small as possible by improving fabrication process technology, while the bootstrap factor kf defined in this theory should be as small as possible

Published in:

IEEE Transactions on Electron Devices  (Volume:38 ,  Issue: 5 )