This paper proposes and deomstrates a novel type of a vision chip that utilizes pulse trains for image processing. The chip is based on a pulse frequency modulation (PFM) technique, which is used in neurobiological systems. Two types of chips are designed; one is a pixel TEG (test element group) chip for testing avaailability of PFM for image acquisition using 0.35 mu m triple-metal double-poly CMOS process and the other is for a vision chip with inhibitory interconnections using 1.2 mu m double-metal double-poly CMOS process. The TEG chip works well in the power supply voltage of 0.7V and has a dynamic range of 20dB with a power consumption of less than 1 mu W. The operation of the nutual inhibition in the vision chip is confirmed by simulation. Also the comparison with the oher pulse modulation technique, pulse width modulation is discussed.
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