Light-sensitive CMOS ring oscillator |
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Authors: | Jankovic ND Brajovic V |
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Institution: | Robotics Inst., Carnegie Mellon Univ., Pittsburgh, PA; |
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Abstract: | A simple light-sensitive CMOS ring oscillator, the oscillation frequency of which depends on the chip ambient illumination, is presented. An experimental 21-stage ring oscillator fabricated in 0.5 μm CMOS changes the pulse frequency from 50 Hz in total darkness to 2 MHz in extreme bright ambient at Vdd=1 V |
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